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GCN Circular 12616

Subject

GRB 111204A: MASTER optical observations

Date

2011-12-04T18:06:51Z (13 years ago)

From

Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>

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


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

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


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

  V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina
  Blagoveschensk Educational State University, Blagoveschensk

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Kislovodsk was pointed to the  GRB111204A (Sonbas et al., GCN 
Circ 12612Loading...
 
 ) 115 sec after GRB trigger time  after sunset.
Unfortunately our first (20s exposure) images are saturated.

The first unsaturated  images was 2828 sec after GRB 
time at 2011-12-04 14:24:36.065 UT. On our 180s exposure white+polarizator 
set we  haven`t found optical transient  within SWIFT error-box.
The 5-sigma upper limit has been about 15.0  mag.

Our coaded image (started at 2011-12-04 15:00:58 UT, 3240s effective 
exposition) has limit 19.2 mag.

  The message may be cited.