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GCN Circular 12289

Subject

GRB 110820A: MASTER-NET observations

Date

2011-08-20T18:05:47Z (13 years ago)

From

Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@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.