TITLE: GCN CIRCULAR NUMBER: 32456 SUBJECT: Fermi GRB 220810A: Global MASTER-Net observations report DATE: 22/08/11 00:15:15 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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 (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 220810A ( Fermi GBM team, GCN 32455) errorbox 445 sec after notice time and 476 sec after trigger time at 2022-08-10 23:23:38 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 39 deg. The sun altitude is -71.2 deg. The galactic latitude b = -22 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=2053838 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 521 | 2022-08-10 23:23:38 | MASTER-SAAO | (20h 45m 02.76s , +02d 31m 33.6s) | C | 90 | 17.6 | 656 | 2022-08-10 23:25:37 | MASTER-SAAO | (20h 36m 27.23s , +02d 32m 24.0s) | C | 120 | 17.8 | 821 | 2022-08-10 23:25:37 | MASTER-SAAO | (20h 36m 27.24s , +02d 32m 24.0s) | C | 450 | 18.3 | Coadd 821 | 2022-08-10 23:28:08 | MASTER-SAAO | (20h 36m 30.98s , +02d 34m 05.9s) | C | 150 | 17.9 | 1018 | 2022-08-10 23:31:09 | MASTER-SAAO | (20h 36m 24.61s , +02d 33m 36.9s) | C | 180 | 17.4 | 1228 | 2022-08-10 23:34:40 | MASTER-SAAO | (20h 36m 24.10s , +02d 34m 44.8s) | C | 180 | 17.9 | 1438 | 2022-08-10 23:38:10 | MASTER-SAAO | (20h 36m 29.40s , +02d 33m 51.2s) | C | 180 | 17.8 | 1649 | 2022-08-10 23:41:41 | MASTER-SAAO | (20h 36m 23.40s , +02d 32m 58.0s) | C | 180 | 17.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.