[vsnet-grb-info 10868] GRB 110820A: MASTER-NET observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12289
SUBJECT: GRB 110820A: MASTER-NET observations
DATE:    11/08/20 18:05:47 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at observ.inetcomm.ru>

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.Kuznetsov, D.Zimnukhov, M. Kornilov, 
A.Sankovich
Sternberg Astronomical Institute, Moscow State University

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

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 Tunka(Siberia) was pointed to the  GRB110820A 45 sec after 
notice time and 133 sec after GRB time at 2011-08-20 17:40:40.275 UT in 
two polarizations. On  our first (30s exposure) set we haven`t found 
optical transient  within SWIFT error-box.

The 5-sigma upper limit has been about 16.5 mag
  The message may be cited.