TITLE: GCN CIRCULAR NUMBER: 38751 SUBJECT: Swift GRB250101.56: Global MASTER-Net observations report DATE: 25/01/01 13:34:39 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB250101.56 (trigger No 1278305,02h 28m 14.64s , +19d 09m 14.4s, R=0.05) errorbox 35 sec after notice time and 86 sec after trigger time at 2025-01-01 13:24:16 UT, with upper limit up to 20.7 mag. The observations began at zenith distance = 32 deg. The sun altitude is -38.6 deg.
The galactic latitude b = -38 deg., longitude l = 153 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2730214
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________
96 | MASTER-Tunka | C | 20 | 19.8 | 121 | MASTER-Tunka | C | 70 | 20.5 | Coadd 120 | MASTER-Tunka | C | 20 | 19.9 | 148 | MASTER-Tunka | C | 30 | 20.1 | 182 | MASTER-Tunka | C | 30 | 20.1 | 227 | MASTER-Tunka | C | 120 | 20.7 | Coadd 220 | MASTER-Tunka | C | 40 | 20.2 | 269 | MASTER-Tunka | C | 50 | 20.2 | 327 | MASTER-Tunka | C | 60 | 20.3 | 396 | MASTER-Tunka | C | 70 | 20.4 | 480 | MASTER-Tunka | C | 90 | 20.4 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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