TITLE: GCN CIRCULAR NUMBER: 30827 SUBJECT: Fermi trigger No 653124492: Global MASTER-Net observations report DATE: 21/09/12 17:30:21 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-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 GRB210912.31 (trigger No 653124492,19h 37m 24.00s , +14d 11m 24.0s, R=5.57) errorbox 33104 sec after notice time and 33347 sec after trigger time at 2021-09-12 16:43:55 UT, with upper limit up to 16.7 mag. Observations started at twilight. The observations began at zenith distance = 26 deg. The sun altitude is -14.6 deg. The galactic latitude b = -4 deg., longitude l = 51 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1718336 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 33378 | 2021-09-12 16:43:55 | MASTER-Kislovodsk | (19h 43m 31.87s , +18d 28m 39.5s) | C | 60 | 16.4 | 33378 | 2021-09-12 16:43:55 | MASTER-Kislovodsk | (19h 48m 16.06s , +18d 04m 09.4s) | C | 60 | 16.3 | 33628 | 2021-09-12 16:48:05 | MASTER-Kislovodsk | (19h 41m 05.91s , +20d 21m 52.7s) | C | 60 | 16.3 | 33628 | 2021-09-12 16:48:05 | MASTER-Kislovodsk | (19h 45m 53.81s , +19d 57m 19.9s) | C | 60 | 15.5 | 33708 | 2021-09-12 16:49:25 | MASTER-Kislovodsk | (19h 47m 07.26s , +16d 34m 45.7s) | C | 60 | 16.5 | 33708 | 2021-09-12 16:49:25 | MASTER-Kislovodsk | (19h 51m 48.08s , +16d 10m 15.5s) | C | 60 | 16.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.