TITLE: GCN CIRCULAR NUMBER: 30808 SUBJECT: Fermi trigger No 653031163: Global MASTER-Net observations report DATE: 21/09/11 06:15:39 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB210911.23 (trigger No 653031163,19h 31m 19.20s , +12d 09m 36.0s, R=4.94) errorbox 159 sec after notice time and 200 sec after trigger time at 2021-09-11 05:35:58 UT, with upper limit up to 15.8 mag. The observations began at zenith distance = 83 deg. The sun altitude is -59.5 deg. The galactic latitude b = -4 deg., longitude l = 49 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1717161 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 215 | 2021-09-11 05:35:58 | MASTER-OAFA | (19h 29m 27.70s , +12d 47m 25.6s) | C | 30 | 15.1 | 270 | 2021-09-11 05:36:48 | MASTER-OAFA | (19h 29m 21.22s , +12d 46m 29.5s) | C | 40 | 15.3 | 339 | 2021-09-11 05:37:48 | MASTER-OAFA | (19h 29m 27.35s , +12d 46m 58.3s) | C | 60 | 15.5 | 424 | 2021-09-11 05:39:07 | MASTER-OAFA | (19h 29m 23.11s , +12d 48m 31.7s) | C | 70 | 15.8 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.