MASTER Net MASTER Database: GRB210818.68 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 GRB210818.68
Trignum 1069242
Trigger time 2021-08-18 16:19:20.22
Notice time 2021-08-18 16:19:47.503027
Coord, eb (19h 58m 22.32s , +35d 11m 39.5s) , 0.0015
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)

You are viewing outdated information, relevant error box is here

All alerts for this trigger
id noticetime coord2000 satel errorbox type trigger seq trig_type links
2680851 2024-11-24 09:48:08.971942 19h 59m 16.49s +35d 16m 37.2s SWIFT 0.05 retraction 1069242 1 4044 retraction
1693906 2021-08-18 16:20:45.281132 19h 58m 22.32s +35d 11m 38.4s SWIFT 0 alert 1069242 1 78 alert
1693904 2021-08-18 16:20:40.058261 19h 58m 22.32s +35d 11m 38.4s SWIFT 0.0015 alert 1069242 5 69 alert
1693907 2021-08-18 16:29:43.542603 19h 58m 33.22s +35d 12m 14.4s SWIFT 0 alert 1069242 12 68 alert
1693895 2021-08-18 16:20:18.390059 19h 58m 22.32s +35d 11m 38.4s SWIFT 0.0015 alert 1069242 5 67 alert
1693877 2021-08-18 16:18:43.658775 19h 59m 16.49s +35d 16m 37.2s SWIFT 0.05 alert 1069242 7 61 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

2021-08-18 16:19:20 (JD 2459445.180093)

Siderial time 16.646940 h

Ra 19:58:22.32 Dec 35:11:39.50
(299.593000d, 35.194306d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: 57.50 Azimuth: 77.76

Sun: Altitude: -25.88 Azimuth: 192.65

Moon: Altitude: -4.24 Azimuth: 53.68

Tunka

Object: Altitude: 70.01 Azimuth: 39.87

Sun: Altitude: -24.28 Azimuth: 166.35

Moon: Altitude: 5.37 Azimuth: 34.45

Kislovodsk

Object: Altitude: 54.70 Azimuth: 268.35

Sun: Altitude: -2.70 Azimuth: 110.87

Moon: Altitude: 17.70 Azimuth: 339.40

Tavrida

Object: Altitude: 48.68 Azimuth: 264.15

Sun: Altitude: 3.40 Azimuth: 104.94

Moon: Altitude: 14.29 Azimuth: 331.98

SAAO

Object: Altitude: -2.04 Azimuth: 228.68

Sun: Altitude: -2.78 Azimuth: 103.62

Moon: Altitude: 51.61 Azimuth: 271.56

IAC

Object: Altitude: 5.68 Azimuth: 232.82

Sun: Altitude: 43.17 Azimuth: 81.06

Moon: Altitude: -4.59 Azimuth: 296.83

Argentina

Object: Altitude: -70.43 Azimuth: 253.72

Sun: Altitude: 44.95 Azimuth: 187.09

Moon: Altitude: -17.47 Azimuth: 316.93

Mexico

Object: Altitude: -21.65 Azimuth: 164.33

Sun: Altitude: 43.92 Azimuth: 282.47

Moon: Altitude: -82.95 Azimuth: 222.17

Ural

Object: Altitude: 61.20 Azimuth: 307.30

Sun: Altitude: -6.08 Azimuth: 125.41

Moon: Altitude: 7.14 Azimuth: 355.62

Vostryakovo

Object: Altitude: 50.77 Azimuth: 279.79

Sun: Altitude: 4.00 Azimuth: 107.15

Moon: Altitude: 5.77 Azimuth: 336.12

Gal. latitude: 2.806555 Gal. longitude: 71.648988

Dist. to Sun: 124.867048

Dist. to Moon: 64.732762

Moon coord.: (276.456209 d, -25.724084 d)

Sun coord.: (147.902509 d, 12.976159 d)

Lunar disk: 0.822988

Lunar phase: 49.761125

Lunar bright limb: 265.424444

No SN in this field

2021-08-18 16:19:47 (JD 2459445.180405)

Siderial time 16.654460 h

Ra 19:58:22.32 Dec 35:11:39.50
(299.593000d, 35.194306d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: 57.43 Azimuth: 77.87

Sun: Altitude: -25.87 Azimuth: 192.77

Moon: Altitude: -4.29 Azimuth: 53.76

Tunka

Object: Altitude: 69.96 Azimuth: 40.11

Sun: Altitude: -24.29 Azimuth: 166.47

Moon: Altitude: 5.33 Azimuth: 34.54

Kislovodsk

Object: Altitude: 54.78 Azimuth: 268.42

Sun: Altitude: -2.78 Azimuth: 110.95

Moon: Altitude: 17.72 Azimuth: 339.49

Tavrida

Object: Altitude: 48.76 Azimuth: 264.22

Sun: Altitude: 3.32 Azimuth: 105.02

Moon: Altitude: 14.33 Azimuth: 332.07

SAAO

Object: Altitude: -1.97 Azimuth: 228.62

Sun: Altitude: -2.87 Azimuth: 103.56

Moon: Altitude: 51.70 Azimuth: 271.51

IAC

Object: Altitude: 5.76 Azimuth: 232.87

Sun: Altitude: 43.07 Azimuth: 81.12

Moon: Altitude: -4.51 Azimuth: 296.88

Argentina

Object: Altitude: -70.34 Azimuth: 253.74

Sun: Altitude: 44.96 Azimuth: 186.94

Moon: Altitude: -17.41 Azimuth: 316.86

Mexico

Object: Altitude: -21.68 Azimuth: 164.42

Sun: Altitude: 44.01 Azimuth: 282.55

Moon: Altitude: -82.89 Azimuth: 222.78

Ural

Object: Altitude: 61.25 Azimuth: 307.47

Sun: Altitude: -6.13 Azimuth: 125.50

Moon: Altitude: 7.14 Azimuth: 355.71

Vostryakovo

Object: Altitude: 50.83 Azimuth: 279.90

Sun: Altitude: 3.94 Azimuth: 107.24

Moon: Altitude: 5.80 Azimuth: 336.21

Gal. latitude: 2.806555 Gal. longitude: 71.648988

Dist. to Sun: 124.867003

Dist. to Moon: 64.731320

Moon coord.: (276.461141 d, -25.724229 d)

Sun coord.: (147.902800 d, 12.976057 d)

Lunar disk: 0.823015

Lunar phase: 49.757014

Lunar bright limb: 265.421904

No SN in this field

2021-08-18 17:19:47 (JD 2459445.222072)

Siderial time 17.657198 h

Ra 19:58:22.32 Dec 35:11:39.50
(299.593000d, 35.194306d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: 47.89 Azimuth: 90.72

Sun: Altitude: -22.51 Azimuth: 208.38

Moon: Altitude: -12.17 Azimuth: 64.16

Tunka

Object: Altitude: 62.55 Azimuth: 64.86

Sun: Altitude: -25.20 Azimuth: 182.55

Moon: Altitude: -0.44 Azimuth: 46.15

Kislovodsk

Object: Altitude: 65.60 Azimuth: 280.29

Sun: Altitude: -12.48 Azimuth: 122.00

Moon: Altitude: 20.18 Azimuth: 352.94

Tavrida

Object: Altitude: 59.43 Azimuth: 274.70

Sun: Altitude: -6.67 Azimuth: 115.71

Moon: Altitude: 18.05 Azimuth: 344.99

SAAO

Object: Altitude: 6.92 Azimuth: 220.14

Sun: Altitude: -15.34 Azimuth: 95.82

Moon: Altitude: 63.83 Azimuth: 262.86

IAC

Object: Altitude: 16.71 Azimuth: 238.55

Sun: Altitude: 29.91 Azimuth: 89.09

Moon: Altitude: 6.42 Azimuth: 303.84

Argentina

Object: Altitude: -58.06 Azimuth: 253.31

Sun: Altitude: 44.23 Azimuth: 166.38

Moon: Altitude: -8.32 Azimuth: 307.38

Mexico

Object: Altitude: -23.70 Azimuth: 177.56

Sun: Altitude: 56.17 Azimuth: 295.34

Moon: Altitude: -71.87 Azimuth: 257.89

Ural

Object: Altitude: 66.51 Azimuth: 332.96

Sun: Altitude: -12.18 Azimuth: 138.99

Moon: Altitude: 6.82 Azimuth: 8.76

Vostryakovo

Object: Altitude: 58.95 Azimuth: 296.05

Sun: Altitude: -3.88 Azimuth: 119.60

Moon: Altitude: 8.22 Azimuth: 349.03

Gal. latitude: 2.806555 Gal. longitude: 71.648988

Dist. to Sun: 124.861078

Dist. to Moon: 64.540261

Moon coord.: (277.118849 d, -25.741962 d)

Sun coord.: (147.941507 d, 12.962552 d)

Lunar disk: 0.826651

Lunar phase: 49.208928

Lunar bright limb: 265.082393

No SN in this field

2024-12-24 13:15:58 (JD 2460669.052755)

Siderial time 22.011287 h

Ra 19:58:22.32 Dec 35:11:39.50
(299.593000d, 35.194306d)

Rise n/a

Transit n/a

Set n/a

Amur

Object: Altitude: 10.32 Azimuth: 134.26

Sun: Altitude: -52.81 Azimuth: 123.99

Moon: Altitude: -36.56 Azimuth: 235.01

Tunka

Object: Altitude: 23.58 Azimuth: 117.54

Sun: Altitude: -38.10 Azimuth: 100.37

Moon: Altitude: -45.31 Azimuth: 204.84

Kislovodsk

Object: Altitude: 61.55 Azimuth: 84.73

Sun: Altitude: 2.12 Azimuth: 54.13

Moon: Altitude: -39.33 Azimuth: 119.36

Tavrida

Object: Altitude: 67.37 Azimuth: 74.46

Sun: Altitude: 6.24 Azimuth: 47.85

Moon: Altitude: -33.41 Azimuth: 112.12

SAAO

Object: Altitude: 21.20 Azimuth: 167.96

Sun: Altitude: 53.56 Azimuth: 93.82

Moon: Altitude: -15.45 Azimuth: 67.85

IAC

Object: Altitude: 68.88 Azimuth: 244.99

Sun: Altitude: 38.21 Azimuth: 3.39

Moon: Altitude: 6.02 Azimuth: 75.86

Argentina

Object: Altitude: -8.05 Azimuth: 233.33

Sun: Altitude: 45.37 Azimuth: 272.15

Moon: Altitude: 57.79 Azimuth: 128.45

Mexico

Object: Altitude: -1.44 Azimuth: 226.52

Sun: Altitude: -12.61 Azimuth: 289.92

Moon: Altitude: 46.68 Azimuth: 336.62

Ural

Object: Altitude: 48.96 Azimuth: 80.90

Sun: Altitude: -13.76 Azimuth: 68.01

Moon: Altitude: -38.30 Azimuth: 146.43

Vostryakovo

Object: Altitude: 60.84 Azimuth: 59.08

Sun: Altitude: -2.57 Azimuth: 50.56

Moon: Altitude: -30.76 Azimuth: 121.71

Gal. latitude: 2.806555 Gal. longitude: 71.648988

Dist. to Sun: 63.747622

Dist. to Moon: 104.716485

Moon coord.: (198.189201 d, -9.452176 d)

Sun coord.: (273.136111 d, -23.415510 d)

Lunar disk: 0.351023

Lunar phase: 107.334799

Lunar bright limb: 111.728704

No SN in this field
Recent coverage and limits telegrams

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

  ID = 4827
TYPE = 35
DAYS = 0


MASTER-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB210818.68 (trigger No 1069242,19h 58m 22.32s , +35d 11m 39.5s, R=0.0015) errorbox  5096 sec after notice time and 5059 sec after trigger time at 2021-08-18 17:43:40 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -10.8 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB210818.68 errorbox  6531 sec after notice time and 6495 sec after trigger time at 2021-08-18 18:07:35 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 16 deg. The sun  altitude  is -19.6 deg. 

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was pointed to the SWIFT GRB210818.68 errorbox  22873 sec after notice time and 22836 sec after trigger time at 2021-08-18 22:39:57 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 10 deg. The sun  altitude  is -35.9 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB210818.68 errorbox  26839 sec after notice time and 26802 sec after trigger time at 2021-08-18 23:46:02 UT, with upper limit up to  15.5 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -20.9 deg. 

The galactic latitude b =  3 deg., longitude l = 72 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1693885

We obtain a following upper limits.  

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

    5150 |      MASTER-Tavrida |   C |   180 | 16.7 |        
    5330 |      MASTER-Tavrida |   C |   540 | 17.1 |  Coadd 
    5349 |      MASTER-Tavrida |   C |   180 | 16.9 |        
    5548 |      MASTER-Tavrida |   C |   180 | 17.0 |        
    5747 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    5927 |      MASTER-Tavrida |   C |   540 | 17.4 |  Coadd 
    5946 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    6145 |      MASTER-Tavrida |   C |   180 | 17.2 |        
    6345 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    6525 |      MASTER-Tavrida |   C |   540 | 17.0 |  Coadd 
    6544 |      MASTER-Tavrida |   C |   180 | 16.8 |        
    6585 |   MASTER-Kislovodsk |   C |   180 | 13.3 |        
    6765 |   MASTER-Kislovodsk |   C |   540 | 15.9 |  Coadd 
    6585 |   MASTER-Kislovodsk |   C |   180 | 13.8 |        
    6765 |   MASTER-Kislovodsk |   C |   540 | 16.1 |  Coadd 
    6743 |      MASTER-Tavrida |   C |   180 | 15.6 |        
    6786 |   MASTER-Kislovodsk |   C |   180 | 14.7 |        
    6786 |   MASTER-Kislovodsk |   C |   180 | 14.8 |        
    6942 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    7122 |      MASTER-Tavrida |   C |   540 | 17.5 |  Coadd 
    6986 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
    6986 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
    7141 |      MASTER-Tavrida |   C |   180 | 17.3 |        
    7187 |   MASTER-Kislovodsk |   C |   180 | 16.8 |        
    7187 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
    7340 |      MASTER-Tavrida |   C |   180 | 17.3 |        
    7962 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
    7962 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
    8448 |   MASTER-Kislovodsk |   C |   180 | 17.5 |        
    8448 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
    8731 |   MASTER-Kislovodsk |   C |   180 | 17.3 |        
    8731 |   MASTER-Kislovodsk |   C |   180 | 17.3 |        
    9014 |   MASTER-Kislovodsk |   C |   180 | 16.4 |        
    9014 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   10273 |      MASTER-Tavrida |   C |   180 | 16.9 |        
   10865 |   MASTER-Kislovodsk |   C |   180 | 16.6 |        
   10865 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
   12671 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   12671 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   14474 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   14474 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   16278 |   MASTER-Kislovodsk |   C |   180 | 16.1 |        
   16278 |   MASTER-Kislovodsk |   C |   180 | 15.9 |        
   16891 |      MASTER-Tavrida |   C |   180 | 17.0 |        
   17790 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   18446 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   18735 |      MASTER-Tavrida |   C |   180 | 14.9 |        
   19022 |      MASTER-Tavrida |   C |   180 | 15.1 |        
   20563 |      MASTER-Tavrida |   C |   180 | 17.7 |        
   22927 |          MASTER-IAC |   C |   180 | 17.3 |        
   22927 |          MASTER-IAC |   C |   180 | 17.0 |        
   23127 |          MASTER-IAC |   C |   180 | 17.4 |        
   23127 |          MASTER-IAC |   C |   180 | 17.1 |        
   23527 |          MASTER-IAC |   C |   180 | 17.3 |        
   23527 |          MASTER-IAC |   C |   180 | 17.2 |        
   23932 |          MASTER-IAC |   C |   180 | 17.4 |        
   23932 |          MASTER-IAC |   C |   180 | 17.1 |        
   24400 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   24934 |          MASTER-IAC |   C |   180 | 17.3 |        
   24934 |          MASTER-IAC |   C |   180 | 17.1 |        
   26735 |          MASTER-IAC |   C |   180 | 17.4 |        
   26735 |          MASTER-IAC |   C |   180 | 17.2 |        
   26892 |         MASTER-OAFA |   C |   180 | 15.0 |        
   27128 |         MASTER-OAFA |   C |   180 | 15.3 |        
   27718 |         MASTER-OAFA |   C |   180 | 15.5 |        
   28166 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   28739 |          MASTER-IAC |   C |   180 | 17.3 |        
   28739 |          MASTER-IAC |   C |   180 | 17.2 |        
   30740 |          MASTER-IAC |   C |   180 | 17.3 |        
   30740 |          MASTER-IAC |   C |   180 | 17.1 |        
   32543 |          MASTER-IAC |   C |   180 | 17.3 |        
   32543 |          MASTER-IAC |   C |   180 | 17.0 |        
   34348 |          MASTER-IAC |   C |   180 | 17.3 |        
   34348 |          MASTER-IAC |   C |   180 | 17.0 |        
   36161 |          MASTER-IAC |   C |   180 | 17.3 |        
   36161 |          MASTER-IAC |   C |   180 | 17.2 |        
   37985 |          MASTER-IAC |   C |   180 | 17.4 |        
   37985 |          MASTER-IAC |   C |   180 | 17.2 |        
   39809 |          MASTER-IAC |   C |   180 | 17.5 |        
   39809 |          MASTER-IAC |   C |   180 | 17.5 |        
   41613 |          MASTER-IAC |   C |   180 | 17.4 |        
   41613 |          MASTER-IAC |   C |   180 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4826
TYPE = 35
DAYS = 0


MASTER-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB210818.68 (trigger No 1069242,19h 58m 22.32s , +35d 11m 39.5s, R=0.0015) errorbox  5096 sec after notice time and 5059 sec after trigger time at 2021-08-18 17:43:40 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -10.8 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB210818.68 errorbox  6531 sec after notice time and 6495 sec after trigger time at 2021-08-18 18:07:35 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 16 deg. The sun  altitude  is -19.6 deg. 

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was pointed to the SWIFT GRB210818.68 errorbox  22873 sec after notice time and 22836 sec after trigger time at 2021-08-18 22:39:57 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 10 deg. The sun  altitude  is -35.9 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB210818.68 errorbox  26839 sec after notice time and 26802 sec after trigger time at 2021-08-18 23:46:02 UT, with upper limit up to  15.5 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -20.9 deg. 

The galactic latitude b =  3 deg., longitude l = 72 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1693885

We obtain a following upper limits.  

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

    5150 |      MASTER-Tavrida |   C |   180 | 16.7 |        
    5330 |      MASTER-Tavrida |   C |   540 | 17.1 |  Coadd 
    5349 |      MASTER-Tavrida |   C |   180 | 16.9 |        
    5548 |      MASTER-Tavrida |   C |   180 | 17.0 |        
    5747 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    5927 |      MASTER-Tavrida |   C |   540 | 17.4 |  Coadd 
    5946 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    6145 |      MASTER-Tavrida |   C |   180 | 17.2 |        
    6345 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    6525 |      MASTER-Tavrida |   C |   540 | 17.0 |  Coadd 
    6544 |      MASTER-Tavrida |   C |   180 | 16.8 |        
    6585 |   MASTER-Kislovodsk |   C |   180 | 13.3 |        
    6765 |   MASTER-Kislovodsk |   C |   540 | 15.9 |  Coadd 
    6585 |   MASTER-Kislovodsk |   C |   180 | 13.8 |        
    6765 |   MASTER-Kislovodsk |   C |   540 | 16.1 |  Coadd 
    6743 |      MASTER-Tavrida |   C |   180 | 15.6 |        
    6786 |   MASTER-Kislovodsk |   C |   180 | 14.7 |        
    6786 |   MASTER-Kislovodsk |   C |   180 | 14.8 |        
    6942 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    7122 |      MASTER-Tavrida |   C |   540 | 17.5 |  Coadd 
    6986 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
    6986 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
    7141 |      MASTER-Tavrida |   C |   180 | 17.3 |        
    7187 |   MASTER-Kislovodsk |   C |   180 | 16.8 |        
    7187 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
    7340 |      MASTER-Tavrida |   C |   180 | 17.3 |        
    7962 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
    7962 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
    8448 |   MASTER-Kislovodsk |   C |   180 | 17.5 |        
    8448 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
    8731 |   MASTER-Kislovodsk |   C |   180 | 17.3 |        
    8731 |   MASTER-Kislovodsk |   C |   180 | 17.3 |        
    9014 |   MASTER-Kislovodsk |   C |   180 | 16.4 |        
    9014 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   10273 |      MASTER-Tavrida |   C |   180 | 16.9 |        
   10865 |   MASTER-Kislovodsk |   C |   180 | 16.6 |        
   10865 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
   12671 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   12671 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   14474 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   14474 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   16278 |   MASTER-Kislovodsk |   C |   180 | 16.1 |        
   16278 |   MASTER-Kislovodsk |   C |   180 | 15.9 |        
   16891 |      MASTER-Tavrida |   C |   180 | 17.0 |        
   17790 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   18446 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   18735 |      MASTER-Tavrida |   C |   180 | 14.9 |        
   19022 |      MASTER-Tavrida |   C |   180 | 15.1 |        
   20563 |      MASTER-Tavrida |   C |   180 | 17.7 |        
   22927 |          MASTER-IAC |   C |   180 | 17.3 |        
   22927 |          MASTER-IAC |   C |   180 | 17.0 |        
   23127 |          MASTER-IAC |   C |   180 | 17.4 |        
   23127 |          MASTER-IAC |   C |   180 | 17.1 |        
   23527 |          MASTER-IAC |   C |   180 | 17.3 |        
   23527 |          MASTER-IAC |   C |   180 | 17.2 |        
   23932 |          MASTER-IAC |   C |   180 | 17.4 |        
   23932 |          MASTER-IAC |   C |   180 | 17.1 |        
   24400 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   24934 |          MASTER-IAC |   C |   180 | 17.3 |        
   24934 |          MASTER-IAC |   C |   180 | 17.1 |        
   26735 |          MASTER-IAC |   C |   180 | 17.4 |        
   26735 |          MASTER-IAC |   C |   180 | 17.2 |        
   26892 |         MASTER-OAFA |   C |   180 | 15.0 |        
   27128 |         MASTER-OAFA |   C |   180 | 15.3 |        
   27718 |         MASTER-OAFA |   C |   180 | 15.5 |        
   28166 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   28739 |          MASTER-IAC |   C |   180 | 17.3 |        
   28739 |          MASTER-IAC |   C |   180 | 17.2 |        
   30740 |          MASTER-IAC |   C |   180 | 17.3 |        
   30740 |          MASTER-IAC |   C |   180 | 17.1 |        
   32543 |          MASTER-IAC |   C |   180 | 17.3 |        
   32543 |          MASTER-IAC |   C |   180 | 17.0 |        
   34348 |          MASTER-IAC |   C |   180 | 17.3 |        
   34348 |          MASTER-IAC |   C |   180 | 17.0 |        
   36161 |          MASTER-IAC |   C |   180 | 17.3 |        
   36161 |          MASTER-IAC |   C |   180 | 17.2 |        
   37985 |          MASTER-IAC |   C |   180 | 17.4 |        
   37985 |          MASTER-IAC |   C |   180 | 17.2 |        
   39809 |          MASTER-IAC |   C |   180 | 17.5 |        
   39809 |          MASTER-IAC |   C |   180 | 17.5 |        
   41613 |          MASTER-IAC |   C |   180 | 17.4 |        
   41613 |          MASTER-IAC |   C |   180 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4825
TYPE = 34
DAYS = 0


MASTER-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB210818.68 (trigger No 1069242,19h 58m 22.32s , +35d 11m 39.5s, R=0.0015) errorbox  5096 sec after notice time and 5059 sec after trigger time at 2021-08-18 17:43:40 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 26 deg. The sun  altitude  is -10.8 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB210818.68 errorbox  6531 sec after notice time and 6495 sec after trigger time at 2021-08-18 18:07:35 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 16 deg. The sun  altitude  is -19.6 deg. 

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was pointed to the SWIFT GRB210818.68 errorbox  22873 sec after notice time and 22836 sec after trigger time at 2021-08-18 22:39:57 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 10 deg. The sun  altitude  is -35.9 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB210818.68 errorbox  26839 sec after notice time and 26802 sec after trigger time at 2021-08-18 23:46:02 UT, with upper limit up to  15.5 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -20.9 deg. 

The galactic latitude b =  3 deg., longitude l = 72 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1693885

We obtain a following upper limits.  

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

    5150 |      MASTER-Tavrida |   C |   180 | 16.7 |        
    5330 |      MASTER-Tavrida |   C |   540 | 17.1 |  Coadd 
    5349 |      MASTER-Tavrida |   C |   180 | 16.9 |        
    5548 |      MASTER-Tavrida |   C |   180 | 17.0 |        
    5747 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    5927 |      MASTER-Tavrida |   C |   540 | 17.4 |  Coadd 
    5946 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    6145 |      MASTER-Tavrida |   C |   180 | 17.2 |        
    6345 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    6525 |      MASTER-Tavrida |   C |   540 | 17.0 |  Coadd 
    6544 |      MASTER-Tavrida |   C |   180 | 16.8 |        
    6585 |   MASTER-Kislovodsk |   C |   180 | 13.3 |        
    6765 |   MASTER-Kislovodsk |   C |   540 | 15.9 |  Coadd 
    6585 |   MASTER-Kislovodsk |   C |   180 | 13.8 |        
    6765 |   MASTER-Kislovodsk |   C |   540 | 16.1 |  Coadd 
    6743 |      MASTER-Tavrida |   C |   180 | 15.6 |        
    6786 |   MASTER-Kislovodsk |   C |   180 | 14.7 |        
    6786 |   MASTER-Kislovodsk |   C |   180 | 14.8 |        
    6942 |      MASTER-Tavrida |   C |   180 | 17.1 |        
    7122 |      MASTER-Tavrida |   C |   540 | 17.5 |  Coadd 
    6986 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
    6986 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
    7141 |      MASTER-Tavrida |   C |   180 | 17.3 |        
    7187 |   MASTER-Kislovodsk |   C |   180 | 16.8 |        
    7187 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
    7340 |      MASTER-Tavrida |   C |   180 | 17.3 |        
    7962 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
    7962 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
    8448 |   MASTER-Kislovodsk |   C |   180 | 17.5 |        
    8448 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
    8731 |   MASTER-Kislovodsk |   C |   180 | 17.3 |        
    8731 |   MASTER-Kislovodsk |   C |   180 | 17.3 |        
    9014 |   MASTER-Kislovodsk |   C |   180 | 16.4 |        
    9014 |   MASTER-Kislovodsk |   C |   180 | 16.5 |        
   10273 |      MASTER-Tavrida |   C |   180 | 16.9 |        
   10865 |   MASTER-Kislovodsk |   C |   180 | 16.6 |        
   10865 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
   12671 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   12671 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   14474 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   14474 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        
   16278 |   MASTER-Kislovodsk |   C |   180 | 16.1 |        
   16278 |   MASTER-Kislovodsk |   C |   180 | 15.9 |        
   16891 |      MASTER-Tavrida |   C |   180 | 17.0 |        
   17790 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   18446 |      MASTER-Tavrida |   C |   180 | 17.8 |        
   18735 |      MASTER-Tavrida |   C |   180 | 14.9 |        
   19022 |      MASTER-Tavrida |   C |   180 | 15.1 |        
   20563 |      MASTER-Tavrida |   C |   180 | 17.7 |        
   22927 |          MASTER-IAC |   C |   180 | 17.3 |        
   22927 |          MASTER-IAC |   C |   180 | 17.0 |        
   23127 |          MASTER-IAC |   C |   180 | 17.4 |        
   23127 |          MASTER-IAC |   C |   180 | 17.1 |        
   23527 |          MASTER-IAC |   C |   180 | 17.3 |        
   23527 |          MASTER-IAC |   C |   180 | 17.2 |        
   23932 |          MASTER-IAC |   C |   180 | 17.4 |        
   23932 |          MASTER-IAC |   C |   180 | 17.1 |        
   24400 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   24934 |          MASTER-IAC |   C |   180 | 17.3 |        
   24934 |          MASTER-IAC |   C |   180 | 17.1 |        
   26735 |          MASTER-IAC |   C |   180 | 17.4 |        
   26735 |          MASTER-IAC |   C |   180 | 17.2 |        
   26892 |         MASTER-OAFA |   C |   180 | 15.0 |        
   27128 |         MASTER-OAFA |   C |   180 | 15.3 |        
   27718 |         MASTER-OAFA |   C |   180 | 15.5 |        
   28166 |      MASTER-Tavrida |   C |   180 | 18.0 |        
   28739 |          MASTER-IAC |   C |   180 | 17.3 |        
   28739 |          MASTER-IAC |   C |   180 | 17.2 |        
   30740 |          MASTER-IAC |   C |   180 | 17.3 |        
   30740 |          MASTER-IAC |   C |   180 | 17.1 |        
   32543 |          MASTER-IAC |   C |   180 | 17.3 |        
   32543 |          MASTER-IAC |   C |   180 | 17.0 |        
   34348 |          MASTER-IAC |   C |   180 | 17.3 |        
   34348 |          MASTER-IAC |   C |   180 | 17.0 |        
   36161 |          MASTER-IAC |   C |   180 | 17.3 |        
   36161 |          MASTER-IAC |   C |   180 | 17.2 |        
   37985 |          MASTER-IAC |   C |   180 | 17.4 |        
   37985 |          MASTER-IAC |   C |   180 | 17.2 |        
   39809 |          MASTER-IAC |   C |   180 | 17.5 |        
   39809 |          MASTER-IAC |   C |   180 | 17.5 |        
   41613 |          MASTER-IAC |   C |   180 | 17.4 |        
   41613 |          MASTER-IAC |   C |   180 | 17.3 |        
Filter C is a clear (unfiltred) band. 


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

MASTER, 2002-2024