TITLE: GCN CIRCULAR NUMBER: 28327 SUBJECT: Fermi GRB 200830A: Global MASTER-Net observations report DATE: 20/08/30 18:00:25 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 GRB 200830A ( Fermi GBM team, GCN 28320) errorbox 26966 sec after notice time and 26992 sec after trigger time at 2020-08-30 17:24:11 UT, with upper limit up to 17.8 mag. Observations started at twilight. The observations began at zenith distance = 40 deg. The sun altitude is -11.4 deg. The galactic latitude b = -3 deg., longitude l = 108 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1430319 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 27023 | 2020-08-30 17:24:11 | MASTER-Tavrida | (22h 18m 55.98s , +49d 54m 04.7s) | C | 60 | 17.0 | 27103 | 2020-08-30 17:25:31 | MASTER-Tavrida | (22h 26m 08.03s , +51d 53m 06.1s) | C | 60 | 16.9 | 27184 | 2020-08-30 17:26:52 | MASTER-Tavrida | (22h 43m 43.82s , +49d 53m 04.9s) | C | 60 | 17.2 | 27345 | 2020-08-30 17:29:33 | MASTER-Tavrida | (22h 18m 49.49s , +49d 55m 01.4s) | C | 60 | 17.3 | 27425 | 2020-08-30 17:30:53 | MASTER-Tavrida | (22h 31m 20.87s , +49d 53m 49.1s) | C | 60 | 17.3 | 27506 | 2020-08-30 17:32:14 | MASTER-Tavrida | (22h 26m 02.03s , +51d 52m 56.0s) | C | 60 | 17.2 | 27586 | 2020-08-30 17:33:34 | MASTER-Tavrida | (22h 39m 05.41s , +51d 52m 58.3s) | C | 60 | 17.3 | 27667 | 2020-08-30 17:34:55 | MASTER-Tavrida | (22h 43m 43.82s , +49d 54m 30.6s) | C | 60 | 17.5 | 27748 | 2020-08-30 17:36:16 | MASTER-Tavrida | (22h 56m 09.16s , +49d 52m 33.7s) | C | 60 | 17.8 | 27828 | 2020-08-30 17:37:36 | MASTER-Tavrida | (22h 37m 46.61s , +47d 54m 37.7s) | C | 60 | 17.4 | 27908 | 2020-08-30 17:38:56 | MASTER-Tavrida | (22h 49m 34.87s , +47d 53m 33.4s) | C | 60 | 17.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.