TITLE: GCN CIRCULAR NUMBER: 31170 SUBJECT: Fermi GRB 211204B: Global MASTER-Net observations report DATE: 21/12/04 15:00:15 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, 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 (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (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 211204B ( Fermi GBM team, GCN 31169) errorbox 9427 sec after notice time and 9453 sec after trigger time at 2021-12-04 14:27:39 UT, with upper limit up to 17.5 mag. Observations started at twilight. The observations began at zenith distance = 60 deg. The sun altitude is -9.2 deg. The galactic latitude b = 19 deg., longitude l = 39 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1803767 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 9484 | 2021-12-04 14:27:39 | MASTER-Kislovodsk | (18h 03m 36.78s , +14d 27m 59.2s) | C | 60 | 13.5 | 9565 | 2021-12-04 14:29:01 | MASTER-Kislovodsk | (17h 57m 48.43s , +16d 22m 15.0s) | C | 60 | 13.2 | 9646 | 2021-12-04 14:30:21 | MASTER-Kislovodsk | (17h 41m 55.16s , +16d 23m 20.5s) | C | 60 | 12.6 | 9646 | 2021-12-04 14:30:21 | MASTER-Kislovodsk | (17h 37m 46.68s , +16d 45m 20.5s) | C | 60 | 15.0 | 9726 | 2021-12-04 14:31:41 | MASTER-Kislovodsk | (17h 39m 27.88s , +12d 33m 20.9s) | C | 60 | 12.7 | 9726 | 2021-12-04 14:31:41 | MASTER-Kislovodsk | (17h 35m 25.80s , +12d 55m 14.3s) | C | 60 | 14.1 | 9806 | 2021-12-04 14:33:01 | MASTER-Kislovodsk | (18h 03m 15.18s , +10d 41m 33.4s) | C | 60 | 12.6 | 9806 | 2021-12-04 14:33:01 | MASTER-Kislovodsk | (17h 59m 13.52s , +11d 03m 34.1s) | C | 60 | 14.1 | 9886 | 2021-12-04 14:34:22 | MASTER-Kislovodsk | (17h 47m 40.77s , +10d 40m 25.3s) | C | 60 | 12.5 | 9967 | 2021-12-04 14:35:42 | MASTER-Kislovodsk | (17h 52m 55.02s , +18d 17m 25.3s) | C | 60 | 13.4 | 10047 | 2021-12-04 14:37:02 | MASTER-Kislovodsk | (18h 10m 40.56s , +12d 34m 48.2s) | C | 60 | 12.9 | 10047 | 2021-12-04 14:37:02 | MASTER-Kislovodsk | (18h 06m 35.75s , +12d 56m 55.0s) | C | 60 | 15.0 | 10127 | 2021-12-04 14:38:22 | MASTER-Kislovodsk | (17h 32m 11.63s , +14d 26m 58.4s) | C | 60 | 13.4 | 10207 | 2021-12-04 14:39:42 | MASTER-Kislovodsk | (17h 48m 01.00s , +14d 27m 36.9s) | C | 60 | 13.7 | 10207 | 2021-12-04 14:39:42 | MASTER-Kislovodsk | (17h 43m 56.31s , +14d 49m 36.3s) | C | 60 | 15.8 | 10287 | 2021-12-04 14:41:02 | MASTER-Kislovodsk | (17h 53m 05.90s , +09d 09m 03.4s) | C | 60 | 15.6 | 10367 | 2021-12-04 14:42:22 | MASTER-Kislovodsk | (17h 55m 02.32s , +12d 33m 22.2s) | C | 60 | 14.4 | 10367 | 2021-12-04 14:42:23 | MASTER-Kislovodsk | (17h 50m 59.68s , +12d 55m 22.8s) | C | 60 | 16.3 | 10447 | 2021-12-04 14:43:43 | MASTER-Kislovodsk | (18h 03m 41.65s , +14d 29m 26.8s) | C | 60 | 15.0 | 10447 | 2021-12-04 14:43:43 | MASTER-Kislovodsk | (17h 59m 35.55s , +14d 51m 31.8s) | C | 60 | 16.8 | 10527 | 2021-12-04 14:45:03 | MASTER-Kislovodsk | (17h 57m 43.44s , +16d 22m 19.5s) | C | 60 | 14.9 | 10527 | 2021-12-04 14:45:03 | MASTER-Kislovodsk | (17h 53m 34.94s , +16d 44m 24.5s) | C | 60 | 16.4 | 10608 | 2021-12-04 14:46:23 | MASTER-Kislovodsk | (17h 41m 51.06s , +16d 22m 59.9s) | C | 60 | 13.6 | 10608 | 2021-12-04 14:46:23 | MASTER-Kislovodsk | (17h 37m 43.92s , +16d 44m 58.7s) | C | 60 | 15.5 | 10688 | 2021-12-04 14:47:43 | MASTER-Kislovodsk | (17h 39m 31.33s , +12d 33m 55.3s) | C | 60 | 13.0 | 10688 | 2021-12-04 14:47:43 | MASTER-Kislovodsk | (17h 35m 32.52s , +12d 55m 47.8s) | C | 60 | 16.0 | 10768 | 2021-12-04 14:49:03 | MASTER-Kislovodsk | (18h 03m 09.60s , +10d 39m 24.1s) | C | 60 | 14.7 | 10768 | 2021-12-04 14:49:03 | MASTER-Kislovodsk | (17h 59m 11.21s , +11d 01m 23.4s) | C | 60 | 16.8 | 10848 | 2021-12-04 14:50:23 | MASTER-Kislovodsk | (17h 47m 48.46s , +10d 39m 13.7s) | C | 60 | 14.5 | 10848 | 2021-12-04 14:50:23 | MASTER-Kislovodsk | (17h 43m 51.51s , +11d 01m 07.6s) | C | 60 | 16.7 | 10928 | 2021-12-04 14:51:44 | MASTER-Kislovodsk | (17h 52m 57.28s , +18d 16m 48.2s) | C | 60 | 14.9 | 11008 | 2021-12-04 14:53:04 | MASTER-Kislovodsk | (18h 10m 37.58s , +12d 33m 54.2s) | C | 60 | 15.2 | 11008 | 2021-12-04 14:53:04 | MASTER-Kislovodsk | (18h 06m 36.33s , +12d 55m 58.0s) | C | 60 | 17.5 | 11089 | 2021-12-04 14:54:24 | MASTER-Kislovodsk | (17h 32m 16.73s , +14d 28m 32.1s) | C | 60 | 15.4 | 11169 | 2021-12-04 14:55:44 | MASTER-Kislovodsk | (17h 47m 54.17s , +14d 27m 54.3s) | C | 60 | 15.7 | 11169 | 2021-12-04 14:55:44 | MASTER-Kislovodsk | (17h 43m 52.73s , +14d 49m 51.0s) | C | 60 | 17.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.