TITLE: GCN CIRCULAR NUMBER: 11185 SUBJECT: GRB 100902A: MASTER Prompt Optical Observations DATE: 10/09/02 21:02:48 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located at Ural (Kourovka) was pointed to the Swift GRB 100902A (Sakamoto et al., GCN Circ 11181) 27 sec after Notice time (104 s after trigger time) in two polarizations. Thre is no optical transient at XRT position (Sakamoto et al., GCN Circ 1118) with next limits: start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd? Filter -------------------------------------------------------------------------- 19:33:38 19:33:58 20 17.0 104.0 N Polariz 19:34:12 19:34:42 30 17.3 132.0 N Polariz 19:34:57 19:35:57 40 17.3 177.0 N Polariz 19:35:51 19:36:41 50 17.4 231.0 N Polariz 19:33:38 19:36:41 140 18.0 104.0 Y Polariz -------------------------------------------------------------------------- The message may be cited. mailto: lipunov@sai.msu.ru