TITLE: GCN CIRCULAR NUMBER: 30816 SUBJECT: Fermi trigger No 653083551: Global MASTER-Net observations report DATE: 21/09/11 21:45:35 GMT 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-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) started inspect of the Fermi GRB210911.84 (trigger No 653083551,19h 06m 36.00s , +06d 22m 01.2s, R=29.37) errorbox 1503 sec after notice time and 1538 sec after trigger time at 2021-09-11 20:31:25 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 40 deg. The sun altitude is -39.3 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB210911.84 errorbox 4042 sec after notice time and 4077 sec after trigger time at 2021-09-11 21:13:44 UT, with upper limit up to 14.9 mag. The observations began at zenith distance = 56 deg. The sun altitude is -42.6 deg. The galactic latitude b = -1 deg., longitude l = 41 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1717890 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1569 | 2021-09-11 20:31:25 | MASTER-Tavrida | (20h 56m 20.36s , +07d 03m 29.2s) | C | 60 | 14.2 | 1807 | 2021-09-11 20:35:22 | MASTER-Tavrida | (20h 53m 55.45s , +10d 49m 34.2s) | C | 60 | 13.1 | 1965 | 2021-09-11 20:38:01 | MASTER-Tavrida | (21h 02m 29.75s , +12d 43m 32.0s) | C | 60 | 13.0 | 2297 | 2021-09-11 20:43:33 | MASTER-Tavrida | (20h 42m 48.09s , +10d 26m 49.8s) | C | 60 | 13.5 | 2376 | 2021-09-11 20:44:52 | MASTER-Tavrida | (20h 43m 02.82s , +12d 19m 47.6s) | C | 60 | 16.0 | 2534 | 2021-09-11 20:47:30 | MASTER-Tavrida | (21h 00m 41.98s , +06d 39m 18.0s) | C | 60 | 14.3 | 2613 | 2021-09-11 20:48:49 | MASTER-Tavrida | (20h 51m 17.14s , +12d 20m 00.7s) | C | 60 | 17.3 | 2838 | 2021-09-11 20:52:34 | MASTER-Tavrida | (20h 06m 05.89s , +18d 03m 18.5s) | C | 60 | 15.0 | 2917 | 2021-09-11 20:53:53 | MASTER-Tavrida | (20h 58m 44.19s , +12d 20m 39.0s) | C | 60 | 17.4 | 2996 | 2021-09-11 20:55:12 | MASTER-Tavrida | (21h 06m 50.09s , +12d 19m 40.7s) | C | 60 | 16.1 | 3075 | 2021-09-11 20:56:31 | MASTER-Tavrida | (20h 43m 02.17s , +08d 31m 41.4s) | C | 60 | 17.5 | 3154 | 2021-09-11 20:57:50 | MASTER-Tavrida | (20h 51m 04.91s , +08d 33m 01.4s) | C | 60 | 17.4 | 3233 | 2021-09-11 20:59:09 | MASTER-Tavrida | (20h 01m 15.80s , +16d 08m 42.0s) | C | 60 | 15.8 | 3312 | 2021-09-11 21:00:28 | MASTER-Tavrida | (20h 09m 30.25s , +16d 07m 58.6s) | C | 60 | 17.0 | 3392 | 2021-09-11 21:01:48 | MASTER-Tavrida | (20h 52m 35.14s , +06d 39m 08.5s) | C | 60 | 18.2 | 3471 | 2021-09-11 21:03:07 | MASTER-Tavrida | (21h 00m 44.87s , +06d 38m 10.0s) | C | 60 | 18.4 | 3688 | 2021-09-11 21:06:44 | MASTER-Tavrida | (20h 22m 07.75s , +18d 02m 57.9s) | C | 60 | 18.0 | 3767 | 2021-09-11 21:08:03 | MASTER-Tavrida | (19h 57m 46.68s , +18d 01m 40.7s) | C | 60 | 17.7 | 3846 | 2021-09-11 21:09:22 | MASTER-Tavrida | (20h 06m 07.44s , +18d 00m 41.9s) | C | 60 | 18.0 | 3925 | 2021-09-11 21:10:41 | MASTER-Tavrida | (20h 11m 41.77s , +19d 56m 42.2s) | C | 60 | 18.0 | 4005 | 2021-09-11 21:12:00 | MASTER-Tavrida | (20h 20m 13.05s , +19d 54m 58.8s) | C | 60 | 18.1 | 4084 | 2021-09-11 21:13:19 | MASTER-Tavrida | (20h 17m 01.04s , +16d 07m 38.6s) | C | 60 | 17.9 | 4108 | 2021-09-11 21:13:44 | MASTER-Kislovodsk | (19h 32m 57.91s , +16d 24m 17.0s) | C | 60 | 14.2 | 4108 | 2021-09-11 21:13:44 | MASTER-Kislovodsk | (19h 28m 40.86s , +16d 46m 48.5s) | C | 60 | 14.9 | 4163 | 2021-09-11 21:14:39 | MASTER-Tavrida | (20h 25m 21.66s , +16d 08m 40.8s) | C | 60 | 18.5 | 4188 | 2021-09-11 21:15:04 | MASTER-Kislovodsk | (19h 33m 49.95s , +14d 51m 50.1s) | C | 60 | 14.1 | 4242 | 2021-09-11 21:15:58 | MASTER-Tavrida | (20h 01m 17.24s , +16d 07m 23.9s) | C | 60 | 18.3 | 4321 | 2021-09-11 21:17:17 | MASTER-Tavrida | (20h 09m 30.83s , +16d 06m 25.3s) | C | 60 | 18.3 | 4679 | 2021-09-11 21:23:15 | MASTER-Tavrida | (20h 03m 59.04s , +19d 56m 13.8s) | C | 60 | 17.8 | 4758 | 2021-09-11 21:24:34 | MASTER-Tavrida | (20h 13m 48.20s , +18d 01m 14.2s) | C | 60 | 18.4 | 4837 | 2021-09-11 21:25:53 | MASTER-Tavrida | (20h 22m 07.55s , +18d 00m 16.0s) | C | 60 | 18.2 | 4916 | 2021-09-11 21:27:12 | MASTER-Tavrida | (19h 57m 48.39s , +18d 00m 00.1s) | C | 60 | 18.0 | 4996 | 2021-09-11 21:28:31 | MASTER-Tavrida | (20h 06m 09.91s , +18d 01m 52.4s) | C | 60 | 18.3 | 5075 | 2021-09-11 21:29:50 | MASTER-Tavrida | (20h 11m 41.97s , +19d 54m 23.0s) | C | 60 | 18.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.