TITLE: GCN CIRCULAR NUMBER: 30761 SUBJECT: Swift GRB210903.58: Global MASTER-Net observations report DATE: 21/09/04 13:56:08 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) was pointed to the Swift GRB210903.58 (trigger No 1071765,12h 24m 38.93s , -62d 40m 53.8s, R=0.0016) errorbox 34282 sec after notice time and 34506 sec after trigger time at 2021-09-03 23:31:41 UT, with upper limit up to 17.3 mag. Observations started at twilight. The observations began at zenith distance = 59 deg. The sun altitude is -16.1 deg.
MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB210903.58 errorbox 41864 sec after notice time and 42088 sec after trigger time at 2021-09-04 01:38:04 UT, with upper limit up to 15.9 mag. The observations began at zenith distance = 84 deg. The sun altitude is -41.4 deg.
The galactic latitude b = -0 deg., longitude l = 300 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1708696
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________
34596 | MASTER-OAFA | C | 180 | 16.8 | 34796 | MASTER-OAFA | C | 180 | 17.3 | 36393 | MASTER-OAFA | C | 180 | 17.3 | 36831 | MASTER-OAFA | C | 180 | 16.6 | 38319 | MASTER-OAFA | C | 180 | 16.5 | 38749 | MASTER-OAFA | C | 180 | 16.9 | 40189 | MASTER-OAFA | C | 180 | 16.6 | 40622 | MASTER-OAFA | C | 180 | 16.9 | 42179 | MASTER-SAAO | C | 180 | 15.9 | 42378 | MASTER-SAAO | C | 180 | 15.6 | 42623 | MASTER-OAFA | C | 180 | 17.0 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.