TITLE: GCN CIRCULAR NUMBER: 32520 SUBJECT: Fermi GRB 220905A: Global MASTER-Net observations report DATE: 22/09/05 18:45:27 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 220905A ( Fermi GBM team, GCN 32518) errorbox 20955 sec after notice time and 20989 sec after trigger time at 2022-09-05 17:18:33 UT, with upper limit up to 18.8 mag. Observations started at twilight. The observations began at zenith distance = 64 deg. The sun altitude is -12.3 deg. The galactic latitude b = -65 deg., longitude l = 12 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2079144 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 21020 | 2022-09-05 17:18:33 | MASTER-SAAO | (22h 51m 26.96s , -33d 15m 04.5s) | C | 60 | 17.6 | 21113 | 2022-09-05 17:20:06 | MASTER-SAAO | (23h 00m 57.10s , -33d 13m 29.5s) | C | 60 | 17.6 | 21196 | 2022-09-05 17:21:29 | MASTER-SAAO | (22h 45m 20.59s , -35d 07m 28.2s) | C | 60 | 18.3 | 21287 | 2022-09-05 17:23:01 | MASTER-SAAO | (22h 55m 02.43s , -35d 08m 23.4s) | C | 60 | 18.4 | 21463 | 2022-09-05 17:25:56 | MASTER-SAAO | (22h 50m 13.38s , -31d 21m 29.9s) | C | 60 | 18.2 | 21870 | 2022-09-05 17:32:43 | MASTER-SAAO | (22h 42m 48.49s , -33d 13m 47.0s) | C | 60 | 18.4 | 22163 | 2022-09-05 17:37:36 | MASTER-SAAO | (22h 51m 19.35s , -33d 13m 37.9s) | C | 60 | 18.3 | 22245 | 2022-09-05 17:38:58 | MASTER-SAAO | (23h 00m 59.57s , -33d 14m 37.1s) | C | 60 | 18.5 | 22338 | 2022-09-05 17:40:31 | MASTER-SAAO | (22h 45m 14.95s , -35d 09m 35.5s) | C | 60 | 18.7 | 22420 | 2022-09-05 17:41:53 | MASTER-SAAO | (22h 55m 06.18s , -35d 09m 31.0s) | C | 60 | 18.8 | 22607 | 2022-09-05 17:45:00 | MASTER-SAAO | (22h 50m 14.90s , -31d 21m 29.0s) | C | 60 | 18.5 | 23017 | 2022-09-05 17:51:50 | MASTER-SAAO | (22h 42m 42.57s , -33d 13m 51.6s) | C | 60 | 18.6 | 23324 | 2022-09-05 17:56:57 | MASTER-SAAO | (22h 51m 17.95s , -33d 15m 51.9s) | C | 60 | 18.7 | 23600 | 2022-09-05 18:01:33 | MASTER-SAAO | (22h 55m 02.30s , -35d 09m 28.6s) | C | 60 | 18.8 | 23774 | 2022-09-05 18:04:27 | MASTER-SAAO | (22h 50m 09.71s , -31d 20m 56.2s) | C | 60 | 18.4 | 23950 | 2022-09-05 18:07:23 | MASTER-SAAO | (22h 42m 46.64s , -33d 14m 54.1s) | C | 60 | 18.8 | 24258 | 2022-09-05 18:12:31 | MASTER-SAAO | (22h 58m 38.98s , -31d 20m 17.1s) | C | 60 | 18.4 | 24610 | 2022-09-05 18:18:23 | MASTER-SAAO | (23h 03m 45.94s , -35d 09m 57.1s) | C | 60 | 18.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.