[vsnet-grb-info 11204] GRB 111204A: MASTER optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12616
SUBJECT: GRB 111204A: MASTER optical observations 
DATE:    11/12/04 18:06:51 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at 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 12612) 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.