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GCN Circular 30788

Subject
Fermi GRB 210909A: Global MASTER-Net observations report
Date
2021-09-09T17:30:49Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, 
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov,  D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile 
(Observatorio Astronomico Felix Aguilar OAFA),

R. Rebolo, M. Serra 
(The Instituto de Astrofisica de Canarias),

D. Buckley 
(South African Astronomical Observatory),

O.A. Gres, N.M. Budnev, O.Ershova 
(Irkutsk State University, API),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich, Yu. Sergienko 
(Blagoveschensk Educational State University)




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) started inspect of the Fermi GRB 210909A ( Fermi GBM team, GCN 30786) errorbox  20793 sec after notice time and 20835 sec after trigger time at 2021-09-09 16:30:34 UT, with upper limit up to  18.9 mag. Observations started at twilight.  The observations began at zenith distance = 51 deg. The sun  altitude  is -11.3 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 210909A errorbox  22297 sec after notice time and 22338 sec after trigger time at 2021-09-09 16:55:38 UT, with upper limit up to  18.3 mag. Observations started at twilight.  The observations began at zenith distance = 53 deg. The sun  altitude  is -9.8 deg. 

The galactic latitude b = 31 deg., longitude l = 129 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1714989

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   20865 | 2021-09-09 16:30:34 |   MASTER-Kislovodsk | (10h 14m 28.70s , +82d 47m 53.6s) |   C |    60 | 16.3 |        
   20865 | 2021-09-09 16:30:34 |   MASTER-Kislovodsk | (09h 41m 16.73s , +83d 05m 01.4s) |   C |    60 | 17.1 |        
   20945 | 2021-09-09 16:31:54 |   MASTER-Kislovodsk | (08h 23m 41.35s , +84d 39m 01.6s) |   C |    60 | 16.6 |        
   20946 | 2021-09-09 16:31:54 |   MASTER-Kislovodsk | (07h 38m 58.88s , +84d 54m 26.6s) |   C |    60 | 17.3 |        
   21026 | 2021-09-09 16:33:15 |   MASTER-Kislovodsk | (08h 12m 17.57s , +82d 43m 50.6s) |   C |    60 | 16.5 |        
   21026 | 2021-09-09 16:33:15 |   MASTER-Kislovodsk | (07h 40m 00.71s , +83d 01m 22.3s) |   C |    60 | 17.2 |        
   21106 | 2021-09-09 16:34:35 |   MASTER-Kislovodsk | (09h 42m 52.34s , +80d 51m 36.6s) |   C |    60 | 16.7 |        
   21106 | 2021-09-09 16:34:35 |   MASTER-Kislovodsk | (09h 17m 11.18s , +81d 09m 45.3s) |   C |    60 | 17.5 |        
   21186 | 2021-09-09 16:35:55 |   MASTER-Kislovodsk | (08h 06m 09.13s , +80d 51m 24.3s) |   C |    60 | 16.9 |        
   21186 | 2021-09-09 16:35:55 |   MASTER-Kislovodsk | (07h 40m 44.78s , +81d 09m 58.0s) |   C |    60 | 17.6 |        
   21266 | 2021-09-09 16:37:15 |   MASTER-Kislovodsk | (11h 10m 25.24s , +84d 40m 57.4s) |   C |    60 | 17.0 |        
   21266 | 2021-09-09 16:37:15 |   MASTER-Kislovodsk | (10h 24m 16.27s , +84d 54m 54.2s) |   C |    60 | 17.8 |        
   21347 | 2021-09-09 16:38:36 |   MASTER-Kislovodsk | (08h 48m 42.49s , +86d 34m 16.5s) |   C |    60 | 17.1 |        
   21347 | 2021-09-09 16:38:36 |   MASTER-Kislovodsk | (07h 36m 57.06s , +86d 43m 45.6s) |   C |    60 | 18.0 |        
   21427 | 2021-09-09 16:39:56 |   MASTER-Kislovodsk | (09h 22m 34.63s , +78d 57m 41.8s) |   C |    60 | 17.1 |        
   21427 | 2021-09-09 16:39:56 |   MASTER-Kislovodsk | (09h 01m 28.93s , +79d 16m 31.4s) |   C |    60 | 17.9 |        
   21507 | 2021-09-09 16:41:16 |   MASTER-Kislovodsk | (11h 19m 46.37s , +80d 54m 45.8s) |   C |    60 | 17.0 |        
   21507 | 2021-09-09 16:41:16 |   MASTER-Kislovodsk | (10h 53m 28.11s , +81d 12m 50.5s) |   C |    60 | 17.9 |        
   21587 | 2021-09-09 16:42:36 |   MASTER-Kislovodsk | (10h 21m 26.17s , +79d 17m 57.3s) |   C |    60 | 18.1 |        
   21667 | 2021-09-09 16:43:56 |   MASTER-Kislovodsk | (11h 43m 38.91s , +83d 04m 51.6s) |   C |    60 | 18.1 |        
   21827 | 2021-09-09 16:46:36 |   MASTER-Kislovodsk | (10h 14m 37.26s , +82d 47m 18.5s) |   C |    60 | 17.1 |        
   21827 | 2021-09-09 16:46:36 |   MASTER-Kislovodsk | (09h 41m 27.54s , +83d 03m 49.6s) |   C |    60 | 18.3 |        
   21908 | 2021-09-09 16:47:56 |   MASTER-Kislovodsk | (08h 23m 51.07s , +84d 38m 06.6s) |   C |    60 | 17.3 |        
   21908 | 2021-09-09 16:47:56 |   MASTER-Kislovodsk | (07h 39m 11.29s , +84d 53m 15.1s) |   C |    60 | 18.3 |        
   21988 | 2021-09-09 16:49:17 |   MASTER-Kislovodsk | (08h 12m 33.75s , +82d 45m 28.3s) |   C |    60 | 17.1 |        
   21988 | 2021-09-09 16:49:17 |   MASTER-Kislovodsk | (07h 40m 03.60s , +83d 02m 47.9s) |   C |    60 | 18.1 |        
   22068 | 2021-09-09 16:50:37 |   MASTER-Kislovodsk | (09h 42m 51.64s , +80d 51m 47.2s) |   C |    60 | 17.3 |        
   22068 | 2021-09-09 16:50:37 |   MASTER-Kislovodsk | (09h 17m 06.72s , +81d 09m 47.4s) |   C |    60 | 18.5 |        
   22148 | 2021-09-09 16:51:57 |   MASTER-Kislovodsk | (07h 40m 48.78s , +81d 10m 07.3s) |   C |    60 | 18.2 |        
   22148 | 2021-09-09 16:51:57 |   MASTER-Kislovodsk | (08h 06m 15.07s , +80d 51m 34.7s) |   C |    60 | 17.3 |        
   22228 | 2021-09-09 16:53:17 |   MASTER-Kislovodsk | (11h 10m 34.85s , +84d 41m 30.5s) |   C |    60 | 17.2 |        
   22228 | 2021-09-09 16:53:17 |   MASTER-Kislovodsk | (10h 24m 21.62s , +84d 55m 25.0s) |   C |    60 | 18.4 |        
   22309 | 2021-09-09 16:54:38 |   MASTER-Kislovodsk | (08h 49m 05.00s , +86d 32m 02.9s) |   C |    60 | 17.3 |        
   22309 | 2021-09-09 16:54:38 |   MASTER-Kislovodsk | (07h 38m 03.19s , +86d 42m 03.9s) |   C |    60 | 18.5 |        
   22369 | 2021-09-09 16:55:38 |      MASTER-Tavrida | (06h 55m 26.00s , +82d 42m 36.7s) |   C |    60 | 16.4 |        
   22389 | 2021-09-09 16:55:58 |   MASTER-Kislovodsk | (09h 22m 47.49s , +78d 56m 52.4s) |   C |    60 | 17.4 |        
   22389 | 2021-09-09 16:55:58 |   MASTER-Kislovodsk | (09h 01m 42.46s , +79d 15m 41.5s) |   C |    60 | 18.3 |        
   22469 | 2021-09-09 16:57:18 |   MASTER-Kislovodsk | (11h 19m 54.63s , +80d 53m 59.4s) |   C |    60 | 17.2 |        
   22469 | 2021-09-09 16:57:18 |   MASTER-Kislovodsk | (10h 53m 37.55s , +81d 11m 58.5s) |   C |    60 | 18.4 |        
   22550 | 2021-09-09 16:58:38 |   MASTER-Kislovodsk | (10h 21m 29.34s , +79d 16m 51.5s) |   C |    60 | 18.6 |        
   22630 | 2021-09-09 16:59:58 |   MASTER-Kislovodsk | (11h 43m 39.94s , +83d 05m 55.2s) |   C |    60 | 18.4 |        
   22790 | 2021-09-09 17:02:39 |   MASTER-Kislovodsk | (09h 41m 32.34s , +83d 03m 39.8s) |   C |    60 | 18.5 |        
   22790 | 2021-09-09 17:02:39 |   MASTER-Kislovodsk | (10h 14m 43.09s , +82d 47m 07.3s) |   C |    60 | 17.3 |        
   22870 | 2021-09-09 17:03:59 |   MASTER-Kislovodsk | (07h 39m 26.26s , +84d 53m 54.7s) |   C |    60 | 18.4 |        
   22870 | 2021-09-09 17:03:59 |   MASTER-Kislovodsk | (08h 24m 14.18s , +84d 38m 32.4s) |   C |    60 | 17.4 |        
   22951 | 2021-09-09 17:05:19 |   MASTER-Kislovodsk | (07h 40m 17.83s , +83d 00m 58.2s) |   C |    60 | 18.2 |        
   22951 | 2021-09-09 17:05:19 |   MASTER-Kislovodsk | (08h 12m 42.35s , +82d 43m 28.0s) |   C |    60 | 17.2 |        
   23031 | 2021-09-09 17:06:40 |   MASTER-Kislovodsk | (07h 41m 27.45s , +83d 01m 00.4s) |   C |    60 | 15.4 |        
   23031 | 2021-09-09 17:06:40 |   MASTER-Kislovodsk | (08h 13m 26.89s , +82d 43m 28.5s) |   C |    60 | 14.3 |        
   23111 | 2021-09-09 17:08:00 |   MASTER-Kislovodsk | (07h 42m 25.79s , +83d 01m 02.0s) |   C |    60 | 15.2 |        
   23111 | 2021-09-09 17:08:00 |   MASTER-Kislovodsk | (08h 14m 51.39s , +82d 43m 31.1s) |   C |    60 | 14.5 |        
   23191 | 2021-09-09 17:09:20 |   MASTER-Kislovodsk | (11h 10m 37.44s , +84d 40m 37.1s) |   C |    60 | 17.4 |        
   23191 | 2021-09-09 17:09:20 |   MASTER-Kislovodsk | (10h 24m 33.41s , +84d 54m 34.9s) |   C |    60 | 18.5 |        
   23272 | 2021-09-09 17:10:40 |   MASTER-Kislovodsk | (08h 49m 39.01s , +86d 33m 30.5s) |   C |    60 | 17.4 |        
   23272 | 2021-09-09 17:10:40 |   MASTER-Kislovodsk | (07h 38m 03.59s , +86d 43m 53.2s) |   C |    60 | 18.6 |        
   23352 | 2021-09-09 17:12:00 |   MASTER-Kislovodsk | (09h 22m 46.92s , +78d 57m 13.9s) |   C |    60 | 17.5 |        
   23352 | 2021-09-09 17:12:00 |   MASTER-Kislovodsk | (09h 01m 41.45s , +79d 16m 06.2s) |   C |    60 | 18.6 |        
   23431 | 2021-09-09 17:13:20 |   MASTER-Kislovodsk | (11h 19m 55.59s , +80d 54m 05.9s) |   C |    60 | 17.5 |        
   23431 | 2021-09-09 17:13:20 |   MASTER-Kislovodsk | (10h 53m 39.60s , +81d 12m 03.4s) |   C |    60 | 18.6 |        
   23512 | 2021-09-09 17:14:40 |   MASTER-Kislovodsk | (10h 21m 38.29s , +79d 17m 13.7s) |   C |    60 | 18.9 |        
   23592 | 2021-09-09 17:16:00 |   MASTER-Kislovodsk | (11h 43m 46.21s , +83d 03m 59.1s) |   C |    60 | 18.6 |        
   24005 | 2021-09-09 17:22:54 |      MASTER-Tavrida | (06h 40m 04.63s , +84d 43m 17.7s) |   C |    60 | 18.3 |        
Filter C is a clear (unfiltred) band. 


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