TITLE: GCN CIRCULAR NUMBER: 31034 SUBJECT: Fermi GRB 211102A: Global MASTER-Net observations report DATE: 21/11/02 15:30:24 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, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, 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 (Irkutsk State University, API),

A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),

A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)

MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 211102A ( Fermi GBM team, GCN 31029) errorbox 26099 sec after notice time and 26125 sec after trigger time at 2021-11-02 15:21:29 UT, with upper limit up to 17.3 mag. Observations started at twilight. The observations began at zenith distance = 56 deg. The sun altitude is -9.4 deg.

The galactic latitude b = -4 deg., longitude l = 133 deg.

Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1772827

We obtain a following upper limits.

Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________

26156 | 2021-11-02 15:21:29 | MASTER-Tavrida | (02h 19m 20.35s , +52d 42m 02.2s) | C | 60 | 17.2 | 26235 | 2021-11-02 15:22:48 | MASTER-Tavrida | (02h 32m 24.06s , +52d 41m 08.7s) | C | 60 | 17.3 | Filter C is a clear (unfiltred) band.

The observation and reduction will continue. The message may be cited.