MASTER Net MASTER Database: GRB210820.73 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 GRB210820.73
Trignum 1069551
Trigger time 2021-08-20 17:38:00.7
Notice time 2021-08-20 17:39:21.399532
Coord, eb (01h 22m 30.96s , +04d 37m 55.2s) , 0.05
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You are viewing outdated information, relevant error box is here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
2268726 2023-09-11 00:36:22.643579 01h 22m 30.96s +04d 37m 55.2s SWIFT 0.05 retraction 1069551 1 4044 retraction
1695796 2021-08-20 17:48:23.032119 01h 22m 33.60s +04d 36m 28.8s SWIFT 0.000194444 alert 1069551 3 81 alert
1695789 2021-08-20 17:42:22.897577 01h 22m 33.12s +04d 36m 25.2s SWIFT 0 alert 1069551 1 78 alert
1695788 2021-08-20 17:42:16.171742 01h 22m 33.12s +04d 36m 25.2s SWIFT 0.00130556 alert 1069551 6 69 alert
1695797 2021-08-20 17:50:13.157929 01h 22m 24.12s +04d 37m 15.6s SWIFT 0 alert 1069551 14 68 alert
1695806 2021-08-20 17:57:43.756778 01h 22m 33.41s +04d 36m 28.1s SWIFT 0.0005 alert 1069551 9 67 alert
1695766 2021-08-20 17:39:33.131293 01h 22m 30.96s +04d 37m 55.2s SWIFT 0.05 alert 1069551 8 61 alert

DAYS:

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

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

2021-08-20 17:38:00 (JD 2459447.234722)

Siderial time 18.093060 h

Ra 01:22:30.96 Dec 04:37:55.20
( 20.629000d, 4.632000d)

Rise 2021-08-20 21:23:24

Transit 2021-08-21 03:53:44

Set 2021-08-21 10:24:05

Amur

Object: Altitude: 41.50 Azimuth: 333.81

Sun: Altitude: -21.60 Azimuth: 213.25

Moon: Altitude: 2.91 Azimuth: 47.28

Tunka

Object: Altitude: 30.56 Azimuth: 306.78

Sun: Altitude: -25.60 Azimuth: 187.63

Moon: Altitude: 10.95 Azimuth: 26.57

Kislovodsk

Object: Altitude: -7.03 Azimuth: 256.67

Sun: Altitude: -15.81 Azimuth: 125.28

Moon: Altitude: 16.92 Azimuth: 329.38

Tavrida

Object: Altitude: -12.59 Azimuth: 250.26

Sun: Altitude: -10.12 Azimuth: 118.79

Moon: Altitude: 12.68 Azimuth: 322.25

SAAO

Object: Altitude: -32.58 Azimuth: 286.96

Sun: Altitude: -18.94 Azimuth: 92.82

Moon: Altitude: 42.08 Azimuth: 273.17

IAC

Object: Altitude: -53.38 Azimuth: 208.58

Sun: Altitude: 25.52 Azimuth: 90.64

Moon: Altitude: -11.61 Azimuth: 290.22

Argentina

Object: Altitude: -46.58 Azimuth: 58.87

Sun: Altitude: 43.72 Azimuth: 160.02

Moon: Altitude: -25.06 Azimuth: 323.24

Mexico

Object: Altitude: -8.45 Azimuth: 100.65

Sun: Altitude: 59.27 Azimuth: 301.74

Moon: Altitude: -80.99 Azimuth: 149.78

Ural

Object: Altitude: 5.35 Azimuth: 269.73

Sun: Altitude: -14.40 Azimuth: 143.14

Moon: Altitude: 8.80 Azimuth: 346.08

Vostryakovo

Object: Altitude: -6.79 Azimuth: 251.60

Sun: Altitude: -6.72 Azimuth: 123.25

Moon: Altitude: 5.44 Azimuth: 326.48

Gal. latitude: -56.961693 Gal. longitude: 138.450519

Dist. to Sun: 126.726963

Dist. to Moon: 75.728178

Moon coord.: (308.310605 d, -23.176059 d)

Sun coord.: (149.807208 d, 12.303142 d)

Lunar disk: 0.959973

Lunar phase: 23.081794

Lunar bright limb: 245.700927

No SN in this field

2021-08-20 17:39:21 (JD 2459447.235660)

Siderial time 18.115622 h

Ra 01:22:30.96 Dec 04:37:55.20
( 20.629000d, 4.632000d)

Rise 2021-08-20 21:23:24

Transit 2021-08-21 03:53:44

Set 2021-08-21 10:24:05

Amur

Object: Altitude: 41.59 Azimuth: 334.24

Sun: Altitude: -21.49 Azimuth: 213.58

Moon: Altitude: 2.76 Azimuth: 47.54

Tunka

Object: Altitude: 30.72 Azimuth: 307.12

Sun: Altitude: -25.57 Azimuth: 187.99

Moon: Altitude: 10.87 Azimuth: 26.86

Kislovodsk

Object: Altitude: -6.79 Azimuth: 256.91

Sun: Altitude: -16.01 Azimuth: 125.55

Moon: Altitude: 17.04 Azimuth: 329.67

Tavrida

Object: Altitude: -12.36 Azimuth: 250.52

Sun: Altitude: -10.33 Azimuth: 119.05

Moon: Altitude: 12.82 Azimuth: 322.52

SAAO

Object: Altitude: -32.31 Azimuth: 286.73

Sun: Altitude: -19.23 Azimuth: 92.64

Moon: Altitude: 42.35 Azimuth: 273.01

IAC

Object: Altitude: -53.23 Azimuth: 209.09

Sun: Altitude: 25.22 Azimuth: 90.80

Moon: Altitude: -11.34 Azimuth: 290.35

Argentina

Object: Altitude: -46.82 Azimuth: 58.53

Sun: Altitude: 43.62 Azimuth: 159.58

Moon: Altitude: -24.90 Azimuth: 322.96

Mexico

Object: Altitude: -8.74 Azimuth: 100.83

Sun: Altitude: 59.51 Azimuth: 302.17

Moon: Altitude: -81.13 Azimuth: 151.50

Ural

Object: Altitude: 5.53 Azimuth: 270.01

Sun: Altitude: -14.51 Azimuth: 143.46

Moon: Altitude: 8.84 Azimuth: 346.37

Vostryakovo

Object: Altitude: -6.61 Azimuth: 251.88

Sun: Altitude: -6.88 Azimuth: 123.54

Moon: Altitude: 5.54 Azimuth: 326.76

Gal. latitude: -56.961693 Gal. longitude: 138.450519

Dist. to Sun: 126.727862

Dist. to Moon: 75.715058

Moon coord.: (308.324583 d, -23.173410 d)

Sun coord.: (149.808075 d, 12.302832 d)

Lunar disk: 0.960014

Lunar phase: 23.069904

Lunar bright limb: 245.689117

No SN in this field

2021-08-20 18:39:21 (JD 2459447.277326)

Siderial time 19.118360 h

Ra 01:22:30.96 Dec 04:37:55.20
( 20.629000d, 4.632000d)

Rise 2021-08-20 21:23:24

Transit 2021-08-21 03:53:44

Set 2021-08-21 10:24:05

Amur

Object: Altitude: 44.19 Azimuth: 354.45

Sun: Altitude: -15.27 Azimuth: 227.58

Moon: Altitude: -4.50 Azimuth: 58.64

Tunka

Object: Altitude: 37.27 Azimuth: 323.43

Sun: Altitude: -23.04 Azimuth: 203.84

Moon: Altitude: 6.11 Azimuth: 39.38

Kislovodsk

Object: Altitude: 3.96 Azimuth: 267.37

Sun: Altitude: -24.07 Azimuth: 138.60

Moon: Altitude: 21.35 Azimuth: 342.95

Tavrida

Object: Altitude: -2.01 Azimuth: 261.46

Sun: Altitude: -19.06 Azimuth: 131.24

Moon: Altitude: 18.24 Azimuth: 335.09

SAAO

Object: Altitude: -19.89 Azimuth: 277.34

Sun: Altitude: -31.88 Azimuth: 84.40

Moon: Altitude: 54.47 Azimuth: 264.83

IAC

Object: Altitude: -44.90 Azimuth: 228.24

Sun: Altitude: 12.05 Azimuth: 97.60

Moon: Altitude: 0.36 Azimuth: 296.62

Argentina

Object: Altitude: -56.56 Azimuth: 39.96

Sun: Altitude: 37.38 Azimuth: 142.08

Moon: Altitude: -16.68 Azimuth: 311.82

Mexico

Object: Altitude: -21.17 Azimuth: 109.53

Sun: Altitude: 68.63 Azimuth: 328.99

Moon: Altitude: -78.15 Azimuth: 229.92

Ural

Object: Altitude: 13.65 Azimuth: 282.81

Sun: Altitude: -18.50 Azimuth: 158.18

Moon: Altitude: 9.91 Azimuth: 359.77

Vostryakovo

Object: Altitude: 1.74 Azimuth: 264.36

Sun: Altitude: -13.39 Azimuth: 136.89

Moon: Altitude: 9.35 Azimuth: 339.57

Gal. latitude: -56.961693 Gal. longitude: 138.450519

Dist. to Sun: 126.767834

Dist. to Moon: 75.132090

Moon coord.: (308.945101 d, -23.054466 d)

Sun coord.: (149.846618 d, 12.289037 d)

Lunar disk: 0.961800

Lunar phase: 22.541921

Lunar bright limb: 245.158281

No SN in this field

2024-06-23 01:57:36 (JD 2460484.581667)

Siderial time 22.583613 h

Ra 01:22:30.96 Dec 04:37:55.20
( 20.629000d, 4.632000d)

Rise 2024-06-23 01:14:18

Transit 2024-06-23 07:44:38

Set 2024-06-23 14:14:59

Amur

Object: Altitude: 29.22 Azimuth: 58.05

Sun: Altitude: 57.57 Azimuth: 317.37

Moon: Altitude: -53.20 Azimuth: 113.64

Tunka

Object: Altitude: 38.92 Azimuth: 30.82

Sun: Altitude: 43.96 Azimuth: 289.40

Moon: Altitude: -37.99 Azimuth: 92.46

Kislovodsk

Object: Altitude: 39.13 Azimuth: 309.40

Sun: Altitude: 3.85 Azimuth: 240.83

Moon: Altitude: 1.75 Azimuth: 47.91

Tavrida

Object: Altitude: 33.60 Azimuth: 301.44

Sun: Altitude: -0.79 Azimuth: 235.00

Moon: Altitude: 5.35 Azimuth: 41.65

SAAO

Object: Altitude: 23.22 Azimuth: 247.91

Sun: Altitude: -45.31 Azimuth: 268.36

Moon: Altitude: 59.37 Azimuth: 89.72

IAC

Object: Altitude: -3.07 Azimuth: 263.07

Sun: Altitude: -36.84 Azimuth: 194.59

Moon: Altitude: 34.08 Azimuth: 357.61

Argentina

Object: Altitude: -50.11 Azimuth: 306.42

Sun: Altitude: -53.69 Azimuth: 86.93

Moon: Altitude: 42.49 Azimuth: 279.82

Mexico

Object: Altitude: -53.09 Azimuth: 163.46

Sun: Altitude: 4.86 Azimuth: 114.50

Moon: Altitude: -18.64 Azimuth: 291.54

Ural

Object: Altitude: 35.28 Azimuth: 335.38

Sun: Altitude: 18.83 Azimuth: 255.73

Moon: Altitude: -14.71 Azimuth: 61.66

Vostryakovo

Object: Altitude: 29.30 Azimuth: 310.53

Sun: Altitude: 7.11 Azimuth: 238.34

Moon: Altitude: -4.10 Azimuth: 44.51

Gal. latitude: -56.961693 Gal. longitude: 138.450519

Dist. to Sun: 71.018809

Dist. to Moon: 95.476527

Moon coord.: (286.861368 d, -27.574659 d)

Sun coord.: (91.933294 d, 23.434977 d)

Lunar disk: 0.985064

Lunar phase: 14.039665

Lunar bright limb: 103.264996

No SN in this field

Recent coverage and limits telegrams

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

  ID = 4837
TYPE = 35
DAYS = 1


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210820A ( A. P. Beardmore et al., GCN 30664) errorbox  4451 sec after notice time and 4532 sec after trigger time at 2021-08-20 18:53:33 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 84 deg. The sun  altitude  is -26.1 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB 210820A errorbox  16743 sec after notice time and 16824 sec after trigger time at 2021-08-20 22:18:24 UT, with upper limit up to  18.5 mag. The observations began at zenith distance = 54 deg. The sun  altitude  is -33.3 deg. 

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was pointed to the SWIFT GRB 210820A errorbox  19860 sec after notice time and 19941 sec after trigger time at 2021-08-20 23:10:22 UT, with upper limit up to  19.0 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -41.0 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB 210820A errorbox  24202 sec after notice time and 24283 sec after trigger time at 2021-08-21 00:22:44 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 44 deg. The sun  altitude  is -59.6 deg. 

The galactic latitude b = -57 deg., longitude l = 138 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1695760

We obtain a following upper limits.  

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

    4622 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
    4622 |   MASTER-Kislovodsk |   C |   180 | 15.2 |        
    4802 |   MASTER-Kislovodsk |   C |   540 | 16.0 |  Coadd 
    4823 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
    4823 |   MASTER-Kislovodsk |   C |   180 | 16.0 |        
    5023 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
    5023 |   MASTER-Kislovodsk |   C |   180 | 15.4 |        
    9900 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
    9900 |   MASTER-Kislovodsk |   C |   180 | 17.7 |        
   10100 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
   10100 |   MASTER-Kislovodsk |   C |   180 | 18.0 |        
   10301 |   MASTER-Kislovodsk |   C |   180 | 17.6 |        
   10301 |   MASTER-Kislovodsk |   C |   180 | 17.6 |        
   11670 |   MASTER-Kislovodsk |   C |   180 | 15.8 |        
   11670 |   MASTER-Kislovodsk |   C |   180 | 16.4 |        
   12074 |   MASTER-Kislovodsk |   C |   180 | 16.0 |        
   12074 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
   13918 |   MASTER-Kislovodsk |   C |   180 | 15.4 |        
   13918 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   14681 |   MASTER-Kislovodsk |   C |   180 | 13.1 |        
   16512 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
   16512 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
   16914 |      MASTER-Tavrida |   C |   180 | 17.3 |        
   17403 |      MASTER-Tavrida |   C |   180 | 17.1 |        
   17678 |   MASTER-Kislovodsk |   C |   180 | 13.8 |        
   17678 |   MASTER-Kislovodsk |   C |   180 | 14.6 |        
   19810 |      MASTER-Tavrida |   C |   180 | 17.9 |        
   20031 |          MASTER-IAC |   C |   180 | 16.1 |        
   20100 |      MASTER-Tavrida |   C |   180 | 16.8 |        
   20449 |          MASTER-IAC |   C |   180 | 16.3 |        
   20871 |          MASTER-IAC |   C |   180 | 16.2 |        
   21298 |      MASTER-Tavrida |   C |   180 | 15.7 |        
   22111 |          MASTER-IAC |   C |   180 | 16.7 |        
   22111 |          MASTER-IAC |   C |   180 | 16.5 |        
   22524 |          MASTER-IAC |   C |   180 | 16.9 |        
   22524 |          MASTER-IAC |   C |   180 | 17.3 |        
   22924 |          MASTER-IAC |   C |   180 | 17.1 |        
   22924 |          MASTER-IAC |   C |   180 | 17.6 |        
   23131 |          MASTER-IAC |   C |   180 | 17.2 |        
   23131 |          MASTER-IAC |   C |   180 | 17.7 |        
   24373 |         MASTER-SAAO |   C |   180 | 19.2 |        
   24575 |         MASTER-SAAO |   C |   180 | 19.5 |        
   25032 |          MASTER-IAC |   C |   180 | 18.3 |        
   25032 |          MASTER-IAC |   C |   180 | 17.8 |        
   25980 |         MASTER-SAAO |   C |   180 | 19.1 |        
   26179 |         MASTER-SAAO |   C |   180 | 17.8 |        
   26599 |         MASTER-SAAO |   C |   180 | 17.1 |        
   26882 |          MASTER-IAC |   C |   180 | 18.3 |        
   26882 |          MASTER-IAC |   C |   180 | 17.9 |        
   27289 |      MASTER-Tavrida |   C |   180 | 18.5 |        
   28026 |         MASTER-SAAO |   C |   180 | 17.4 |        
   28741 |          MASTER-IAC |   C |   180 | 18.5 |        
   28741 |          MASTER-IAC |   C |   180 | 18.1 |        
   30729 |          MASTER-IAC |   C |   180 | 18.5 |        
   30729 |          MASTER-IAC |   C |   180 | 18.2 |        
   31537 |         MASTER-SAAO |   C |   180 | 17.9 |        
   33446 |         MASTER-SAAO |   C |   180 | 18.7 |        
   33913 |          MASTER-IAC |   C |   180 | 18.5 |        
   33913 |          MASTER-IAC |   C |   180 | 18.5 |        
   35298 |         MASTER-SAAO |   C |   180 | 18.5 |        
   37103 |         MASTER-SAAO |   C |   180 | 18.3 |        
   41135 |          MASTER-IAC |   C |   180 | 19.0 |        
   41135 |          MASTER-IAC |   C |   180 | 18.8 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4836
TYPE = 35
DAYS = 0.5


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210820A ( A. P. Beardmore et al., GCN 30664) errorbox  4451 sec after notice time and 4532 sec after trigger time at 2021-08-20 18:53:33 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 84 deg. The sun  altitude  is -26.1 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the SWIFT GRB 210820A errorbox  16743 sec after notice time and 16824 sec after trigger time at 2021-08-20 22:18:24 UT, with upper limit up to  18.5 mag. The observations began at zenith distance = 54 deg. The sun  altitude  is -33.3 deg. 

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) was pointed to the SWIFT GRB 210820A errorbox  19860 sec after notice time and 19941 sec after trigger time at 2021-08-20 23:10:22 UT, with upper limit up to  19.0 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -41.0 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) was pointed to the SWIFT GRB 210820A errorbox  24202 sec after notice time and 24283 sec after trigger time at 2021-08-21 00:22:44 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 44 deg. The sun  altitude  is -59.6 deg. 

The galactic latitude b = -57 deg., longitude l = 138 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1695760

We obtain a following upper limits.  

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

    4622 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
    4622 |   MASTER-Kislovodsk |   C |   180 | 15.2 |        
    4802 |   MASTER-Kislovodsk |   C |   540 | 16.0 |  Coadd 
    4823 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
    4823 |   MASTER-Kislovodsk |   C |   180 | 16.0 |        
    5023 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
    5023 |   MASTER-Kislovodsk |   C |   180 | 15.4 |        
    9900 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
    9900 |   MASTER-Kislovodsk |   C |   180 | 17.7 |        
   10100 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        
   10100 |   MASTER-Kislovodsk |   C |   180 | 18.0 |        
   10301 |   MASTER-Kislovodsk |   C |   180 | 17.6 |        
   10301 |   MASTER-Kislovodsk |   C |   180 | 17.6 |        
   11670 |   MASTER-Kislovodsk |   C |   180 | 15.8 |        
   11670 |   MASTER-Kislovodsk |   C |   180 | 16.4 |        
   12074 |   MASTER-Kislovodsk |   C |   180 | 16.0 |        
   12074 |   MASTER-Kislovodsk |   C |   180 | 16.7 |        
   13918 |   MASTER-Kislovodsk |   C |   180 | 15.4 |        
   13918 |   MASTER-Kislovodsk |   C |   180 | 16.3 |        
   14681 |   MASTER-Kislovodsk |   C |   180 | 13.1 |        
   16512 |   MASTER-Kislovodsk |   C |   180 | 13.5 |        
   16512 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
   16914 |      MASTER-Tavrida |   C |   180 | 17.3 |        
   17403 |      MASTER-Tavrida |   C |   180 | 17.1 |        
   17678 |   MASTER-Kislovodsk |   C |   180 | 13.8 |        
   17678 |   MASTER-Kislovodsk |   C |   180 | 14.6 |        
   19810 |      MASTER-Tavrida |   C |   180 | 17.9 |        
   20031 |          MASTER-IAC |   C |   180 | 16.1 |        
   20100 |      MASTER-Tavrida |   C |   180 | 16.8 |        
   20449 |          MASTER-IAC |   C |   180 | 16.3 |        
   20871 |          MASTER-IAC |   C |   180 | 16.2 |        
   21298 |      MASTER-Tavrida |   C |   180 | 15.7 |        
   22111 |          MASTER-IAC |   C |   180 | 16.7 |        
   22111 |          MASTER-IAC |   C |   180 | 16.5 |        
   22524 |          MASTER-IAC |   C |   180 | 16.9 |        
   22524 |          MASTER-IAC |   C |   180 | 17.3 |        
   22924 |          MASTER-IAC |   C |   180 | 17.1 |        
   22924 |          MASTER-IAC |   C |   180 | 17.6 |        
   23131 |          MASTER-IAC |   C |   180 | 17.2 |        
   23131 |          MASTER-IAC |   C |   180 | 17.7 |        
   24373 |         MASTER-SAAO |   C |   180 | 19.2 |        
   24575 |         MASTER-SAAO |   C |   180 | 19.5 |        
   25032 |          MASTER-IAC |   C |   180 | 18.3 |        
   25032 |          MASTER-IAC |   C |   180 | 17.8 |        
   25980 |         MASTER-SAAO |   C |   180 | 19.1 |        
   26179 |         MASTER-SAAO |   C |   180 | 17.8 |        
   26599 |         MASTER-SAAO |   C |   180 | 17.1 |        
   26882 |          MASTER-IAC |   C |   180 | 18.3 |        
   26882 |          MASTER-IAC |   C |   180 | 17.9 |        
   27289 |      MASTER-Tavrida |   C |   180 | 18.5 |        
   28026 |         MASTER-SAAO |   C |   180 | 17.4 |        
   28741 |          MASTER-IAC |   C |   180 | 18.5 |        
   28741 |          MASTER-IAC |   C |   180 | 18.1 |        
   30729 |          MASTER-IAC |   C |   180 | 18.5 |        
   30729 |          MASTER-IAC |   C |   180 | 18.2 |        
   31537 |         MASTER-SAAO |   C |   180 | 17.9 |        
   33446 |         MASTER-SAAO |   C |   180 | 18.7 |        
   33913 |          MASTER-IAC |   C |   180 | 18.5 |        
   33913 |          MASTER-IAC |   C |   180 | 18.5 |        
   35298 |         MASTER-SAAO |   C |   180 | 18.5 |        
   37103 |         MASTER-SAAO |   C |   180 | 18.3 |        
   41135 |          MASTER-IAC |   C |   180 | 19.0 |        
   41135 |          MASTER-IAC |   C |   180 | 18.8 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4834
TYPE = 35
DAYS = 0.1


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210820A ( A. P. Beardmore et al., GCN 30664) errorbox  4451 sec after notice time and 4532 sec after trigger time at 2021-08-20 18:53:33 UT, with upper limit up to  16.0 mag. The observations began at zenith distance = 84 deg. The sun  altitude  is -26.1 deg. 

The galactic latitude b = -57 deg., longitude l = 138 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1695760

We obtain a following upper limits.  

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

    4622 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
    4622 |   MASTER-Kislovodsk |   C |   180 | 15.2 |        
    4802 |   MASTER-Kislovodsk |   C |   540 | 16.0 |  Coadd 
    4823 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
    4823 |   MASTER-Kislovodsk |   C |   180 | 16.0 |        
    5023 |   MASTER-Kislovodsk |   C |   180 | 14.0 |        
    5023 |   MASTER-Kislovodsk |   C |   180 | 15.4 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4833
TYPE = 35
DAYS = 0


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210820A ( A. P. Beardmore et al., GCN 30664) errorbox  4451 sec after notice time and 4532 sec after trigger time at 2021-08-20 18:53:33 UT, with upper limit up to  15.2 mag. The observations began at zenith distance = 84 deg. The sun  altitude  is -26.1 deg. 

The galactic latitude b = -57 deg., longitude l = 138 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1695760

We obtain a following upper limits.  

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

    4622 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
    4622 |   MASTER-Kislovodsk |   C |   180 | 15.2 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4832
TYPE = 35
DAYS = 0


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210820A ( A. P. Beardmore et al., GCN 30664) errorbox  4451 sec after notice time and 4532 sec after trigger time at 2021-08-20 18:53:33 UT, with upper limit up to  15.2 mag. The observations began at zenith distance = 84 deg. The sun  altitude  is -26.1 deg. 

The galactic latitude b = -57 deg., longitude l = 138 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1695760

We obtain a following upper limits.  

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

    4622 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
    4622 |   MASTER-Kislovodsk |   C |   180 | 15.2 |        
Filter C is a clear (unfiltred) band. 


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



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

  ID = 4831
TYPE = 34
DAYS = 0


MASTER-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SWIFT GRB 210820A ( A. P. Beardmore et al., GCN 30664) errorbox  4451 sec after notice time and 4532 sec after trigger time at 2021-08-20 18:53:33 UT, with upper limit up to  15.2 mag. The observations began at zenith distance = 84 deg. The sun  altitude  is -26.1 deg. 

The galactic latitude b = -57 deg., longitude l = 138 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1695760

We obtain a following upper limits.  

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

    4622 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
    4622 |   MASTER-Kislovodsk |   C |   180 | 15.2 |        
Filter C is a clear (unfiltred) band. 


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



 

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