MASTER Net MASTER Database: GRB230311.81 page

Please use the reference to MASTER DataBase as Lipunov et al., 2010, MASTER Robotic Net, Advances in Astronomy, vol. 2010, p.30L

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GRB coord: ErrorBox (deg): Sys Error (deg):
Sattel : Trigger: Notice:
GRB_Name: trignum: Nights after: FullSky


Name SWIFT GRB230311.81
Trignum 1159434
Trigger time 2023-03-11 19:27:41.1
Notice time 2023-03-11 19:28:16.889715
Coord, eb (16h 20m 12.48s , -15d 54m 07.2s) , 0.00119444
Max dist: 1 sigma 3 sigma
AGN candidates: Milliquas
r90wise
wiseXgaia
BL Lac candidates: 1 Sigma
3 Sigma

MASTER observatories and transients from them in error-field
Kislovodsk Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Amur Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Tunka Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
OAFA Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
IAC Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
SAAO Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
Tavrida Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)
OAGH Transients (Undef)
(All)
(Yes)
Trans. Difference (Undef)
(All)
(Yes)
(Gal)

All alerts for this trigger
id noticetime coord2000 satel errorbox type trigger seq trig_type links
2203789 2023-03-11 19:28:32.068886 16h 20m 12.48s -15d 54m 07.2s SWIFT 0 alert 1159434 1 78 alert
2203786 2023-03-11 19:28:28.189973 16h 20m 12.48s -15d 54m 07.2s SWIFT 0.00119444 alert 1159434 1 69 alert
2203797 2023-03-11 19:46:29.067969 16h 20m 14.54s -15d 53m 42.0s SWIFT 0 alert 1159434 4 68 alert
2203775 2023-03-11 19:28:16.889715 16h 20m 12.48s -15d 54m 07.2s SWIFT 0.00119444 alert 1159434 1 67 alert

DAYS:

MASTER optical transients in this field
Will be published in GCN, ATEL

Synchronous WFC images
Distance datetime coord2000 observatory camera links
Errorbox center visibility at MASTER facilities
trigger notice notice+1hr now

2023-03-11 19:27:41 (JD 2460015.310891)

Siderial time 9.249301 h

Ra 16:20:12.48 Dec -15:54:07.20
(245.052000d, -15.902000d)

Rise 2023-03-13 01:02:54

Transit 2023-03-12 05:31:46

Set 2023-03-12 09:56:41

Amur

Object: Altitude: 22.22 Azimuth: 342.89

Sun: Altitude: -23.26 Azimuth: 245.94

Moon: Altitude: 23.64 Azimuth: 11.74

Tunka

Object: Altitude: 13.55 Azimuth: 319.67

Sun: Altitude: -34.72 Azimuth: 221.11

Moon: Altitude: 21.89 Azimuth: 346.19

Kislovodsk

Object: Altitude: -19.08 Azimuth: 274.03

Sun: Altitude: -43.06 Azimuth: 140.51

Moon: Altitude: 0.66 Azimuth: 292.13

Tavrida

Object: Altitude: -25.19 Azimuth: 267.73

Sun: Altitude: -38.12 Azimuth: 131.40

Moon: Altitude: -5.41 Azimuth: 286.23

SAAO

Object: Altitude: -17.28 Azimuth: 302.48

Sun: Altitude: -30.87 Azimuth: 62.07

Moon: Altitude: 3.61 Azimuth: 285.86

IAC

Object: Altitude: -68.10 Azimuth: 239.67

Sun: Altitude: -4.59 Azimuth: 88.25

Moon: Altitude: -44.65 Azimuth: 263.67

Argentina

Object: Altitude: -32.62 Azimuth: 38.77

Sun: Altitude: 42.84 Azimuth: 118.11

Moon: Altitude: -42.57 Azimuth: 7.44

Mexico

Object: Altitude: -21.35 Azimuth: 83.80

Sun: Altitude: 55.23 Azimuth: 358.85

Moon: Altitude: -44.64 Azimuth: 99.28

Ural

Object: Altitude: -10.30 Azimuth: 283.40

Sun: Altitude: -36.00 Azimuth: 166.72

Moon: Altitude: 3.77 Azimuth: 306.02

Vostryakovo

Object: Altitude: -22.16 Azimuth: 266.03

Sun: Altitude: -32.12 Azimuth: 140.77

Moon: Altitude: -6.22 Azimuth: 288.04

Gal. latitude: 22.961711 Gal. longitude: 359.303761

Dist. to Sun: 104.612894

Dist. to Moon: 26.556820

Moon coord.: (217.465444 d, -15.312475 d)

Sun coord.: (351.393715 d, -3.712903 d)

Lunar disk: 0.826024

Lunar phase: 49.303796

Lunar bright limb: 108.844405

No SN in this field

2023-03-11 19:28:16 (JD 2460015.311296)

Siderial time 9.259050 h

Ra 16:20:12.48 Dec -15:54:07.20
(245.052000d, -15.902000d)

Rise 2023-03-13 01:02:54

Transit 2023-03-12 05:31:46

Set 2023-03-12 09:56:41

Amur

Object: Altitude: 22.24 Azimuth: 343.04

Sun: Altitude: -23.17 Azimuth: 246.07

Moon: Altitude: 23.62 Azimuth: 11.88

Tunka

Object: Altitude: 13.61 Azimuth: 319.80

Sun: Altitude: -34.66 Azimuth: 221.28

Moon: Altitude: 21.91 Azimuth: 346.33

Kislovodsk

Object: Altitude: -18.97 Azimuth: 274.13

Sun: Altitude: -43.13 Azimuth: 140.69

Moon: Altitude: 0.75 Azimuth: 292.22

Tavrida

Object: Altitude: -25.08 Azimuth: 267.83

Sun: Altitude: -38.19 Azimuth: 131.56

Moon: Altitude: -5.32 Azimuth: 286.33

SAAO

Object: Altitude: -17.18 Azimuth: 302.38

Sun: Altitude: -30.98 Azimuth: 61.96

Moon: Altitude: 3.72 Azimuth: 285.79

IAC

Object: Altitude: -67.99 Azimuth: 239.90

Sun: Altitude: -4.72 Azimuth: 88.32

Moon: Altitude: -44.53 Azimuth: 263.75

Argentina

Object: Altitude: -32.70 Azimuth: 38.63

Sun: Altitude: 42.73 Azimuth: 117.98

Moon: Altitude: -42.59 Azimuth: 7.25

Mexico

Object: Altitude: -21.48 Azimuth: 83.87

Sun: Altitude: 55.23 Azimuth: 359.11

Moon: Altitude: -44.76 Azimuth: 99.37

Ural

Object: Altitude: -10.22 Azimuth: 283.52

Sun: Altitude: -36.02 Azimuth: 166.90

Moon: Altitude: 3.83 Azimuth: 306.14

Vostryakovo

Object: Altitude: -22.08 Azimuth: 266.15

Sun: Altitude: -32.17 Azimuth: 140.93

Moon: Altitude: -6.15 Azimuth: 288.15

Gal. latitude: 22.961711 Gal. longitude: 359.303761

Dist. to Sun: 104.613297

Dist. to Moon: 26.551828

Moon coord.: (217.470448 d, -15.314577 d)

Sun coord.: (351.394087 d, -3.712744 d)

Lunar disk: 0.825992

Lunar phase: 49.308628

Lunar bright limb: 108.843459

No SN in this field

2023-03-11 20:28:16 (JD 2460015.352963)

Siderial time 10.261788 h

Ra 16:20:12.48 Dec -15:54:07.20
(245.052000d, -15.902000d)

Rise 2023-03-13 01:02:54

Transit 2023-03-12 05:31:46

Set 2023-03-12 09:56:41

Amur

Object: Altitude: 23.77 Azimuth: 358.68

Sun: Altitude: -14.05 Azimuth: 258.61

Moon: Altitude: 20.35 Azimuth: 26.57

Tunka

Object: Altitude: 18.70 Azimuth: 333.90

Sun: Altitude: -27.64 Azimuth: 236.76

Moon: Altitude: 22.65 Azimuth: 1.45

Kislovodsk

Object: Altitude: -8.26 Azimuth: 284.14

Sun: Altitude: -48.43 Azimuth: 160.85

Moon: Altitude: 9.89 Azimuth: 302.89

Tavrida

Object: Altitude: -14.43 Azimuth: 278.24

Sun: Altitude: -44.97 Azimuth: 149.47

Moon: Altitude: 4.11 Azimuth: 296.69

SAAO

Object: Altitude: -5.93 Azimuth: 293.08

Sun: Altitude: -41.42 Azimuth: 48.60

Moon: Altitude: 15.82 Azimuth: 278.62

IAC

Object: Altitude: -55.66 Azimuth: 256.32

Sun: Altitude: -17.90 Azimuth: 95.57

Moon: Altitude: -31.85 Azimuth: 271.35

Argentina

Object: Altitude: -39.25 Azimuth: 22.66

Sun: Altitude: 30.91 Azimuth: 106.43

Moon: Altitude: -41.89 Azimuth: 348.32

Mexico

Object: Altitude: -34.34 Azimuth: 91.38

Sun: Altitude: 52.60 Azimuth: 24.28

Moon: Altitude: -56.89 Azimuth: 110.56

Ural

Object: Altitude: -2.53 Azimuth: 295.85

Sun: Altitude: -36.54 Azimuth: 185.49

Moon: Altitude: 9.45 Azimuth: 319.06

Vostryakovo

Object: Altitude: -13.56 Azimuth: 278.44

Sun: Altitude: -36.46 Azimuth: 158.33

Moon: Altitude: 1.19 Azimuth: 300.10

Gal. latitude: 22.961711 Gal. longitude: 359.303761

Dist. to Sun: 104.654683

Dist. to Moon: 26.038737

Moon coord.: (217.985857 d, -15.530303 d)

Sun coord.: (351.432403 d, -3.696379 d)

Lunar disk: 0.822690

Lunar phase: 49.805892

Lunar bright limb: 108.744548

No SN in this field

2025-05-09 06:57:05 (JD 2460804.789641)

Siderial time 0.615811 h

Ra 16:20:12.48 Dec -15:54:07.20
(245.052000d, -15.902000d)

Rise 2025-05-09 21:12:50

Transit 2025-05-10 01:37:45

Set 2025-05-09 06:06:37

Amur

Object: Altitude: -46.03 Azimuth: 230.86

Sun: Altitude: 36.61 Azimuth: 71.73

Moon: Altitude: -4.99 Azimuth: 273.04

Tunka

Object: Altitude: -53.28 Azimuth: 195.62

Sun: Altitude: 48.82 Azimuth: 43.91

Moon: Altitude: -19.98 Azimuth: 253.20

Kislovodsk

Object: Altitude: -38.87 Azimuth: 106.52

Sun: Altitude: 52.30 Azimuth: 304.29

Moon: Altitude: -51.85 Azimuth: 186.74

Tavrida

Object: Altitude: -32.71 Azimuth: 100.25

Sun: Altitude: 46.54 Azimuth: 295.78

Moon: Altitude: -50.86 Azimuth: 173.17

SAAO

Object: Altitude: -5.50 Azimuth: 67.23

Sun: Altitude: 18.53 Azimuth: 234.19

Moon: Altitude: -48.36 Azimuth: 26.81

IAC

Object: Altitude: 9.14 Azimuth: 66.30

Sun: Altitude: 7.29 Azimuth: 254.18

Moon: Altitude: -33.51 Azimuth: 102.67

Argentina

Object: Altitude: 67.67 Azimuth: 131.39

Sun: Altitude: -54.28 Azimuth: 285.13

Moon: Altitude: 18.04 Azimuth: 94.44

Mexico

Object: Altitude: 37.76 Azimuth: 330.58

Sun: Altitude: -41.37 Azimuth: 173.81

Moon: Altitude: 42.58 Azimuth: 44.54

Ural

Object: Altitude: -41.63 Azimuth: 134.16

Sun: Altitude: 48.77 Azimuth: 338.08

Moon: Altitude: -36.10 Azimuth: 206.44

Vostryakovo

Object: Altitude: -32.27 Azimuth: 110.15

Sun: Altitude: 42.87 Azimuth: 308.93

Moon: Altitude: -40.39 Azimuth: 179.30

Gal. latitude: 22.961711 Gal. longitude: 359.303761

Dist. to Sun: 161.791667

Dist. to Moon: 54.888679

Moon coord.: (189.961743 d, -5.776463 d)

Sun coord.: (46.101798 d, 17.355632 d)

Lunar disk: 0.898994

Lunar phase: 37.061602

Lunar bright limb: 291.280878

No SN in this field
Recent coverage and limits telegrams

 #######################################################################################
#######################################################################################

  ID = 7926
TYPE = 35
DAYS = 1


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159435,16h 20m 10.63s , -15d 54m 46.4s, R=0.05) errorbox  7291 sec after notice time and 7384 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB230311.81 errorbox  16361 sec after notice time and 16454 sec after trigger time at 2023-03-12 00:05:51 UT, with upper limit up to  16.5 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -36.3 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203790

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7475 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7655 |         MASTER-SAAO |   C |   540 | 16.9 |  Coadd 
    8285 |         MASTER-SAAO |   C |  1800 | 18.0 |  Coadd 
    7675 |         MASTER-SAAO |   C |   180 | 16.4 |        
    7887 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8098 |         MASTER-SAAO |   C |   180 | 16.9 |        
    8310 |         MASTER-SAAO |   C |   180 | 17.0 |        
    8490 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
    8521 |         MASTER-SAAO |   C |   180 | 17.2 |        
    8733 |         MASTER-SAAO |   C |   180 | 17.2 |        
    8944 |         MASTER-SAAO |   C |   180 | 17.4 |        
    9124 |         MASTER-SAAO |   C |   540 | 17.9 |  Coadd 
    9156 |         MASTER-SAAO |   C |   180 | 14.1 |        
    9156 |         MASTER-SAAO |   C |   180 | 17.3 |        
    9336 |         MASTER-SAAO |   C |   540 | 17.2 |  Coadd 
    9966 |         MASTER-SAAO |   C |  1800 | 18.2 |  Coadd 
    9368 |         MASTER-SAAO |   C |   180 | 17.5 |        
    9368 |         MASTER-SAAO |   C |   180 | 16.0 |        
    9581 |         MASTER-SAAO |   C |   180 | 17.4 |        
    9761 |         MASTER-SAAO |   C |   540 | 18.1 |  Coadd 
    9581 |         MASTER-SAAO |   C |   180 | 16.7 |        
    9792 |         MASTER-SAAO |   C |   180 | 17.5 |        
   10602 |         MASTER-SAAO |   C |  1800 | 18.8 |  Coadd 
    9792 |         MASTER-SAAO |   C |   180 | 17.1 |        
   10004 |         MASTER-SAAO |   C |   180 | 17.4 |        
   10004 |         MASTER-SAAO |   C |   180 | 17.1 |        
   10184 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
   10216 |         MASTER-SAAO |   C |   180 | 17.4 |        
   10216 |         MASTER-SAAO |   C |   180 | 17.6 |        
   10396 |         MASTER-SAAO |   C |   540 | 18.3 |  Coadd 
   10428 |         MASTER-SAAO |   C |   180 | 17.6 |        
   10428 |         MASTER-SAAO |   C |   180 | 17.5 |        
   10640 |         MASTER-SAAO |   C |   180 | 17.7 |        
   10640 |         MASTER-SAAO |   C |   180 | 17.7 |        
   10820 |         MASTER-SAAO |   C |   540 | 17.6 |  Coadd 
   10852 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11032 |         MASTER-SAAO |   C |   540 | 18.3 |  Coadd 
   10852 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11064 |         MASTER-SAAO |   C |   180 | 17.7 |        
   11064 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11276 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11276 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11456 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   11487 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11667 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   11487 |         MASTER-SAAO |   C |   180 | 17.9 |        
   11699 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11699 |         MASTER-SAAO |   C |   180 | 17.9 |        
   11898 |         MASTER-SAAO |   C |   180 | 17.7 |        
   11898 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12078 |         MASTER-SAAO |   C |   540 | 18.5 |  Coadd 
   12110 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12290 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   12110 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12321 |         MASTER-SAAO |   C |   180 | 17.7 |        
   12321 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12521 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12521 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12701 |         MASTER-SAAO |   C |   540 | 18.7 |  Coadd 
   12733 |         MASTER-SAAO |   C |   180 | 17.8 |        
   12733 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12944 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12945 |         MASTER-SAAO |   C |   180 | 18.1 |        
   16544 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
   16758 |   MASTER-Kislovodsk |   C |   180 | 14.1 |        
   17760 |   MASTER-Kislovodsk |   C |   180 | 14.4 |        
   17760 |   MASTER-Kislovodsk |   C |   180 | 14.9 |        
   19780 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   19780 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
   21110 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   21110 |   MASTER-Kislovodsk |   C |   180 | 15.0 |        
   22988 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
   23188 |   MASTER-Kislovodsk |   C |   180 | 16.1 |        
   23188 |   MASTER-Kislovodsk |   C |   180 | 14.6 |        
   24772 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 7925
TYPE = 35
DAYS = 1


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159434,16h 20m 12.48s , -15d 54m 07.2s, R=0.00119444) errorbox  7594 sec after notice time and 7620 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB230311.81 errorbox  16663 sec after notice time and 16690 sec after trigger time at 2023-03-12 00:05:51 UT, with upper limit up to  16.5 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -36.3 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203774

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7711 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7891 |         MASTER-SAAO |   C |   540 | 16.9 |  Coadd 
    8521 |         MASTER-SAAO |   C |  1800 | 18.0 |  Coadd 
    7911 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8123 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8334 |         MASTER-SAAO |   C |   180 | 16.9 |        
    8546 |         MASTER-SAAO |   C |   180 | 17.0 |        
    8726 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
    8757 |         MASTER-SAAO |   C |   180 | 17.2 |        
    8969 |         MASTER-SAAO |   C |   180 | 17.2 |        
    9180 |         MASTER-SAAO |   C |   180 | 17.4 |        
    9360 |         MASTER-SAAO |   C |   540 | 17.9 |  Coadd 
    9392 |         MASTER-SAAO |   C |   180 | 14.1 |        
    9392 |         MASTER-SAAO |   C |   180 | 17.3 |        
    9572 |         MASTER-SAAO |   C |   540 | 17.2 |  Coadd 
   10202 |         MASTER-SAAO |   C |  1800 | 18.2 |  Coadd 
    9604 |         MASTER-SAAO |   C |   180 | 17.5 |        
    9604 |         MASTER-SAAO |   C |   180 | 16.0 |        
    9817 |         MASTER-SAAO |   C |   180 | 17.4 |        
    9997 |         MASTER-SAAO |   C |   540 | 18.1 |  Coadd 
    9817 |         MASTER-SAAO |   C |   180 | 16.7 |        
   10028 |         MASTER-SAAO |   C |   180 | 17.5 |        
   10838 |         MASTER-SAAO |   C |  1800 | 18.8 |  Coadd 
   10028 |         MASTER-SAAO |   C |   180 | 17.1 |        
   10240 |         MASTER-SAAO |   C |   180 | 17.4 |        
   10240 |         MASTER-SAAO |   C |   180 | 17.1 |        
   10420 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
   10452 |         MASTER-SAAO |   C |   180 | 17.4 |        
   10452 |         MASTER-SAAO |   C |   180 | 17.6 |        
   10632 |         MASTER-SAAO |   C |   540 | 18.3 |  Coadd 
   10664 |         MASTER-SAAO |   C |   180 | 17.6 |        
   10664 |         MASTER-SAAO |   C |   180 | 17.5 |        
   10876 |         MASTER-SAAO |   C |   180 | 17.7 |        
   10876 |         MASTER-SAAO |   C |   180 | 17.7 |        
   11056 |         MASTER-SAAO |   C |   540 | 17.6 |  Coadd 
   11088 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11268 |         MASTER-SAAO |   C |   540 | 18.3 |  Coadd 
   11088 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11300 |         MASTER-SAAO |   C |   180 | 17.7 |        
   11300 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11511 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11512 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11692 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   11723 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11903 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   11723 |         MASTER-SAAO |   C |   180 | 17.9 |        
   11935 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11935 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12134 |         MASTER-SAAO |   C |   180 | 17.7 |        
   12134 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12314 |         MASTER-SAAO |   C |   540 | 18.5 |  Coadd 
   12346 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12526 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   12346 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12557 |         MASTER-SAAO |   C |   180 | 17.7 |        
   12557 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12757 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12757 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12937 |         MASTER-SAAO |   C |   540 | 18.7 |  Coadd 
   12969 |         MASTER-SAAO |   C |   180 | 17.8 |        
   12969 |         MASTER-SAAO |   C |   180 | 18.1 |        
   13180 |         MASTER-SAAO |   C |   180 | 17.9 |        
   13181 |         MASTER-SAAO |   C |   180 | 18.1 |        
   16780 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
   16994 |   MASTER-Kislovodsk |   C |   180 | 14.1 |        
   17996 |   MASTER-Kislovodsk |   C |   180 | 14.4 |        
   17996 |   MASTER-Kislovodsk |   C |   180 | 14.9 |        
   20016 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   20016 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
   21346 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   21346 |   MASTER-Kislovodsk |   C |   180 | 15.0 |        
   23224 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
   23424 |   MASTER-Kislovodsk |   C |   180 | 16.1 |        
   23424 |   MASTER-Kislovodsk |   C |   180 | 14.6 |        
   25008 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 7915
TYPE = 35
DAYS = 0.5


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159435,16h 20m 10.63s , -15d 54m 46.4s, R=0.05) errorbox  7291 sec after notice time and 7384 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB230311.81 errorbox  16361 sec after notice time and 16454 sec after trigger time at 2023-03-12 00:05:51 UT, with upper limit up to  16.5 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -36.3 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203790

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7475 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7655 |         MASTER-SAAO |   C |   540 | 16.9 |  Coadd 
    8285 |         MASTER-SAAO |   C |  1800 | 18.0 |  Coadd 
    7675 |         MASTER-SAAO |   C |   180 | 16.4 |        
    7887 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8098 |         MASTER-SAAO |   C |   180 | 16.9 |        
    8310 |         MASTER-SAAO |   C |   180 | 17.0 |        
    8490 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
    8521 |         MASTER-SAAO |   C |   180 | 17.2 |        
    8733 |         MASTER-SAAO |   C |   180 | 17.2 |        
    8944 |         MASTER-SAAO |   C |   180 | 17.4 |        
    9124 |         MASTER-SAAO |   C |   540 | 17.9 |  Coadd 
    9156 |         MASTER-SAAO |   C |   180 | 14.1 |        
    9156 |         MASTER-SAAO |   C |   180 | 17.3 |        
    9336 |         MASTER-SAAO |   C |   540 | 17.2 |  Coadd 
    9966 |         MASTER-SAAO |   C |  1800 | 18.2 |  Coadd 
    9368 |         MASTER-SAAO |   C |   180 | 17.5 |        
    9368 |         MASTER-SAAO |   C |   180 | 16.0 |        
    9581 |         MASTER-SAAO |   C |   180 | 17.4 |        
    9761 |         MASTER-SAAO |   C |   540 | 18.1 |  Coadd 
    9581 |         MASTER-SAAO |   C |   180 | 16.7 |        
    9792 |         MASTER-SAAO |   C |   180 | 17.5 |        
   10602 |         MASTER-SAAO |   C |  1800 | 18.8 |  Coadd 
    9792 |         MASTER-SAAO |   C |   180 | 17.1 |        
   10004 |         MASTER-SAAO |   C |   180 | 17.4 |        
   10004 |         MASTER-SAAO |   C |   180 | 17.1 |        
   10184 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
   10216 |         MASTER-SAAO |   C |   180 | 17.4 |        
   10216 |         MASTER-SAAO |   C |   180 | 17.6 |        
   10396 |         MASTER-SAAO |   C |   540 | 18.3 |  Coadd 
   10428 |         MASTER-SAAO |   C |   180 | 17.6 |        
   10428 |         MASTER-SAAO |   C |   180 | 17.5 |        
   10640 |         MASTER-SAAO |   C |   180 | 17.7 |        
   10640 |         MASTER-SAAO |   C |   180 | 17.7 |        
   10820 |         MASTER-SAAO |   C |   540 | 17.6 |  Coadd 
   10852 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11032 |         MASTER-SAAO |   C |   540 | 18.3 |  Coadd 
   10852 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11064 |         MASTER-SAAO |   C |   180 | 17.7 |        
   11064 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11276 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11276 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11456 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   11487 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11667 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   11487 |         MASTER-SAAO |   C |   180 | 17.9 |        
   11699 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11699 |         MASTER-SAAO |   C |   180 | 17.9 |        
   11898 |         MASTER-SAAO |   C |   180 | 17.7 |        
   11898 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12078 |         MASTER-SAAO |   C |   540 | 18.5 |  Coadd 
   12110 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12290 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   12110 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12321 |         MASTER-SAAO |   C |   180 | 17.7 |        
   12321 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12521 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12521 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12701 |         MASTER-SAAO |   C |   540 | 18.7 |  Coadd 
   12733 |         MASTER-SAAO |   C |   180 | 17.8 |        
   12733 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12944 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12945 |         MASTER-SAAO |   C |   180 | 18.1 |        
   16544 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
   16758 |   MASTER-Kislovodsk |   C |   180 | 14.1 |        
   17760 |   MASTER-Kislovodsk |   C |   180 | 14.4 |        
   17760 |   MASTER-Kislovodsk |   C |   180 | 14.9 |        
   19780 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   19780 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
   21110 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   21110 |   MASTER-Kislovodsk |   C |   180 | 15.0 |        
   22988 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
   23188 |   MASTER-Kislovodsk |   C |   180 | 16.1 |        
   23188 |   MASTER-Kislovodsk |   C |   180 | 14.6 |        
   24772 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 7914
TYPE = 35
DAYS = 0.5


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159434,16h 20m 12.48s , -15d 54m 07.2s, R=0.00119444) errorbox  7594 sec after notice time and 7620 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB230311.81 errorbox  16663 sec after notice time and 16690 sec after trigger time at 2023-03-12 00:05:51 UT, with upper limit up to  16.5 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -36.3 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203775

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7711 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7891 |         MASTER-SAAO |   C |   540 | 16.9 |  Coadd 
    8521 |         MASTER-SAAO |   C |  1800 | 18.0 |  Coadd 
    7911 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8123 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8334 |         MASTER-SAAO |   C |   180 | 16.9 |        
    8546 |         MASTER-SAAO |   C |   180 | 17.0 |        
    8726 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
    8757 |         MASTER-SAAO |   C |   180 | 17.2 |        
    8969 |         MASTER-SAAO |   C |   180 | 17.2 |        
    9180 |         MASTER-SAAO |   C |   180 | 17.4 |        
    9360 |         MASTER-SAAO |   C |   540 | 17.9 |  Coadd 
    9392 |         MASTER-SAAO |   C |   180 | 14.1 |        
    9392 |         MASTER-SAAO |   C |   180 | 17.3 |        
    9572 |         MASTER-SAAO |   C |   540 | 17.2 |  Coadd 
   10202 |         MASTER-SAAO |   C |  1800 | 18.2 |  Coadd 
    9604 |         MASTER-SAAO |   C |   180 | 17.5 |        
    9604 |         MASTER-SAAO |   C |   180 | 16.0 |        
    9817 |         MASTER-SAAO |   C |   180 | 17.4 |        
    9997 |         MASTER-SAAO |   C |   540 | 18.1 |  Coadd 
    9817 |         MASTER-SAAO |   C |   180 | 16.7 |        
   10028 |         MASTER-SAAO |   C |   180 | 17.5 |        
   10838 |         MASTER-SAAO |   C |  1800 | 18.8 |  Coadd 
   10028 |         MASTER-SAAO |   C |   180 | 17.1 |        
   10240 |         MASTER-SAAO |   C |   180 | 17.4 |        
   10240 |         MASTER-SAAO |   C |   180 | 17.1 |        
   10420 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
   10452 |         MASTER-SAAO |   C |   180 | 17.4 |        
   10452 |         MASTER-SAAO |   C |   180 | 17.6 |        
   10632 |         MASTER-SAAO |   C |   540 | 18.3 |  Coadd 
   10664 |         MASTER-SAAO |   C |   180 | 17.6 |        
   10664 |         MASTER-SAAO |   C |   180 | 17.5 |        
   10876 |         MASTER-SAAO |   C |   180 | 17.7 |        
   10876 |         MASTER-SAAO |   C |   180 | 17.7 |        
   11056 |         MASTER-SAAO |   C |   540 | 17.6 |  Coadd 
   11088 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11268 |         MASTER-SAAO |   C |   540 | 18.3 |  Coadd 
   11088 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11300 |         MASTER-SAAO |   C |   180 | 17.7 |        
   11300 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11511 |         MASTER-SAAO |   C |   180 | 17.6 |        
   11512 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11692 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   11723 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11903 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   11723 |         MASTER-SAAO |   C |   180 | 17.9 |        
   11935 |         MASTER-SAAO |   C |   180 | 17.8 |        
   11935 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12134 |         MASTER-SAAO |   C |   180 | 17.7 |        
   12134 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12314 |         MASTER-SAAO |   C |   540 | 18.5 |  Coadd 
   12346 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12526 |         MASTER-SAAO |   C |   540 | 18.4 |  Coadd 
   12346 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12557 |         MASTER-SAAO |   C |   180 | 17.7 |        
   12557 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12757 |         MASTER-SAAO |   C |   180 | 17.9 |        
   12757 |         MASTER-SAAO |   C |   180 | 18.1 |        
   12937 |         MASTER-SAAO |   C |   540 | 18.7 |  Coadd 
   12969 |         MASTER-SAAO |   C |   180 | 17.8 |        
   12969 |         MASTER-SAAO |   C |   180 | 18.1 |        
   13180 |         MASTER-SAAO |   C |   180 | 17.9 |        
   13181 |         MASTER-SAAO |   C |   180 | 18.1 |        
   16780 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
   16994 |   MASTER-Kislovodsk |   C |   180 | 14.1 |        
   17996 |   MASTER-Kislovodsk |   C |   180 | 14.4 |        
   17996 |   MASTER-Kislovodsk |   C |   180 | 14.9 |        
   20016 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   20016 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
   21346 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   21346 |   MASTER-Kislovodsk |   C |   180 | 15.0 |        
   23224 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
   23424 |   MASTER-Kislovodsk |   C |   180 | 16.1 |        
   23424 |   MASTER-Kislovodsk |   C |   180 | 14.6 |        
   25008 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 7910
TYPE = 35
DAYS = 0.1


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159435,16h 20m 10.63s , -15d 54m 46.4s, R=0.05) errorbox  7291 sec after notice time and 7384 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203790

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7475 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7655 |         MASTER-SAAO |   C |   540 | 16.9 |  Coadd 
    8285 |         MASTER-SAAO |   C |  1800 | 18.0 |  Coadd 
    7675 |         MASTER-SAAO |   C |   180 | 16.4 |        
    7887 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8098 |         MASTER-SAAO |   C |   180 | 16.9 |        
    8310 |         MASTER-SAAO |   C |   180 | 17.0 |        
    8490 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
    8521 |         MASTER-SAAO |   C |   180 | 17.2 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 7909
TYPE = 35
DAYS = 0.1


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159434,16h 20m 12.48s , -15d 54m 07.2s, R=0.00119444) errorbox  7594 sec after notice time and 7620 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203775

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7711 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7891 |         MASTER-SAAO |   C |   540 | 16.9 |  Coadd 
    8521 |         MASTER-SAAO |   C |  1800 | 18.0 |  Coadd 
    7911 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8123 |         MASTER-SAAO |   C |   180 | 16.4 |        
    8334 |         MASTER-SAAO |   C |   180 | 16.9 |        
    8546 |         MASTER-SAAO |   C |   180 | 17.0 |        
    8726 |         MASTER-SAAO |   C |   540 | 17.7 |  Coadd 
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 7904
TYPE = 35
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159434,16h 20m 12.48s , -15d 54m 07.2s, R=0.00119444) errorbox  7594 sec after notice time and 7620 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  16.4 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203775

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7711 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7911 |         MASTER-SAAO |   C |   180 | 16.4 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 7903
TYPE = 35
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159434,16h 20m 12.48s , -15d 54m 07.2s, R=0.00119444) errorbox  7594 sec after notice time and 7620 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  16.4 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203775

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7711 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7911 |         MASTER-SAAO |   C |   180 | 16.4 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.



#######################################################################################
#######################################################################################

  ID = 7902
TYPE = 34
DAYS = 0


MASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB230311.81 (trigger No 1159434,16h 20m 12.48s , -15d 54m 07.2s, R=0.00119444) errorbox  7594 sec after notice time and 7620 sec after trigger time at 2023-03-11 21:34:41 UT, with upper limit up to  16.4 mag. The observations began at zenith distance = 83 deg. The sun  altitude  is -50.2 deg. 

The galactic latitude b = 23 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2203775

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    7711 |         MASTER-SAAO |   C |   180 | 15.8 |        
    7911 |         MASTER-SAAO |   C |   180 | 16.4 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.

MASTER, 2002-2025