TITLE: GCN CIRCULAR NUMBER: 12300 SUBJECT: GRB 110820A: MASTER-NET first hour observations DATE: 11/08/23 06:09:31 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 O. Gres, K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Chuvalaev Irkutsk State University A. Tlatov, A. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka E. Sinyakov, 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 one in each tube. During the analysis of the data of the first hour of observation following results have been received: T-T(GRB) T-T(GRB) T-T(GRB) Exptime Limit Filter Coadd start[s] stop[s] mean [s] [s] (5-sigma) --------------------------------------------------------------- 133 163 148 30 16.4 P_ no 133 163 148 30 16.5 P| no 133 2797 1465 2040 19.3 P_ 14 133 2797 1465 2040 19.6 P| 14 133 2797 1465 4080 19.9 P|+P_ 28 Image in filter P_+P| available here http://observ.pereplet.ru/images/evgeny/GRB110820A.jpg The message may be cited.