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GCN Circular 12756

Subject
GRB 111228A: MASTER OT observations
Date
2011-12-29T07:29:24Z (13 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda,
  Blagoveschensk Educational State University, Blagoveschensk

  E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski,
N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov,  A.Kuznetsov,
D.Zimnukhov, M. Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov,
A.Sankovich, S. Shurpakov
  Sternberg Astronomical Institute, Moscow State University

  K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, 
O.Chuvalaev,E.Konstantinov,
  Irkutsk State University

  A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
  Kislovodsk Solar Station of the Pulkovo Observatory

  V.Krushinski, I.Zalozhnich, A. Popov
  Ural State University, Kourovka


MASTER II  robotic double telescope (MASTER-Net: 
http://observ.pereplet.ru) located in Blagoveschensk was pointed
to the  GRB111228.66 191 sec  after notice time and 244 sec after
GRB time at 2011-12-28 15:48:47.127 UT. The some delay was due to weather conditions.
  On our first (20s exposure, two polarizations, unfiltered) set we found 
optical transient  at Swift OT position (Ukwatta et al., GCN Circ R12737).
The OT magnitude is  about 16.5 mag in both polarizations.

The reduction is continuated.

The message may be cited.
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