TITLE: GCN CIRCULAR NUMBER: 32598 SUBJECT: Fermi GRB 220927A: Global MASTER-Net observations report DATE: 22/09/27 22:45:17 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
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 220927A ( Fermi GBM team, GCN 32594) errorbox 43499 sec after notice time and 61090 sec after trigger time at 2022-09-27 22:34:31 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 74 deg. The sun altitude is -56.2 deg.
The galactic latitude b = -17 deg., longitude l = 236 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2102352
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
61121 | 2022-09-27 22:34:31 | MASTER-SAAO | (06h 17m 38.05s , -29d 19m 22.8s) | C | 60 | 17.4 | 61203 | 2022-09-27 22:35:54 | MASTER-SAAO | (06h 26m 53.28s , -29d 18m 55.6s) | C | 60 | 17.1 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.