TITLE: GCN CIRCULAR NUMBER: 30817 SUBJECT: Fermi trigger No 653084584: Global MASTER-Net observations report DATE: 21/09/11 21:45:42 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 GRB210911.85 (trigger No 653084584,20h 06m 38.40s , +17d 48m 00.0s, R=6.02) errorbox 1419 sec after notice time and 1775 sec after trigger time at 2021-09-11 20:52:34 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 40 deg. The sun altitude is -40.5 deg. The galactic latitude b = -8 deg., longitude l = 58 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1717913 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1805 | 2021-09-11 20:52:34 | MASTER-Tavrida | (20h 06m 05.89s , +18d 03m 18.5s) | C | 60 | 15.0 | 2200 | 2021-09-11 20:59:09 | MASTER-Tavrida | (20h 01m 15.80s , +16d 08m 42.0s) | C | 60 | 15.8 | 2280 | 2021-09-11 21:00:28 | MASTER-Tavrida | (20h 09m 30.25s , +16d 07m 58.6s) | C | 60 | 17.0 | 2655 | 2021-09-11 21:06:44 | MASTER-Tavrida | (20h 22m 07.75s , +18d 02m 57.9s) | C | 60 | 18.0 | 2735 | 2021-09-11 21:08:03 | MASTER-Tavrida | (19h 57m 46.68s , +18d 01m 40.7s) | C | 60 | 17.7 | 2814 | 2021-09-11 21:09:22 | MASTER-Tavrida | (20h 06m 07.44s , +18d 00m 41.9s) | C | 60 | 18.0 | 2893 | 2021-09-11 21:10:41 | MASTER-Tavrida | (20h 11m 41.77s , +19d 56m 42.2s) | C | 60 | 18.0 | 2972 | 2021-09-11 21:12:00 | MASTER-Tavrida | (20h 20m 13.05s , +19d 54m 58.8s) | C | 60 | 18.1 | 3051 | 2021-09-11 21:13:19 | MASTER-Tavrida | (20h 17m 01.04s , +16d 07m 38.6s) | C | 60 | 17.9 | 3130 | 2021-09-11 21:14:39 | MASTER-Tavrida | (20h 25m 21.66s , +16d 08m 40.8s) | C | 60 | 18.5 | 3209 | 2021-09-11 21:15:58 | MASTER-Tavrida | (20h 01m 17.24s , +16d 07m 23.9s) | C | 60 | 18.3 | 3288 | 2021-09-11 21:17:17 | MASTER-Tavrida | (20h 09m 30.83s , +16d 06m 25.3s) | C | 60 | 18.3 | 3646 | 2021-09-11 21:23:15 | MASTER-Tavrida | (20h 03m 59.04s , +19d 56m 13.8s) | C | 60 | 17.8 | 3725 | 2021-09-11 21:24:34 | MASTER-Tavrida | (20h 13m 48.20s , +18d 01m 14.2s) | C | 60 | 18.4 | 3805 | 2021-09-11 21:25:53 | MASTER-Tavrida | (20h 22m 07.55s , +18d 00m 16.0s) | C | 60 | 18.2 | 3884 | 2021-09-11 21:27:12 | MASTER-Tavrida | (19h 57m 48.39s , +18d 00m 00.1s) | C | 60 | 18.0 | 3963 | 2021-09-11 21:28:31 | MASTER-Tavrida | (20h 06m 09.91s , +18d 01m 52.4s) | C | 60 | 18.3 | 4042 | 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.