TITLE: GCN CIRCULAR NUMBER: 11328 SUBJECT: GRB 101008A: MASTER prompt optical observations DATE: 10/10/10 18:46:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 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 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-Net robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located near Ekaterinburg (Kourovka) and Tunka (Baykal Lake) was pointed to the Swift GRB 101008A (Baumgartner et al., GCN#11318, GCN#11319; Beardmore et al., GCN#11321) 53 s after trigger time (immediately after roof opening and with last night focus) and 8309s after trigger time (the Tunka delay was due to weather conditions). Time duration of the GRB 101008A is 104 +- 35 sec (Barthelmy et al., GCN#11327). So we have prompt optical limit at Kourovka site. We see marginaly possible OT (S2, Moskvitin et al.,GCN#11324; Nardini et al., GCN#11326) at Tunka observations. We have next unfiltered estimation: t_start-t_trig(s) mean time exp_time(s) m Coadd? Site -------------------------------------------------------------------------- 53 58 10 >14.5 N Kourovka 53 141 410 >16.0 Y Kourovka 8309 10260 540 19.5+-1.0 Y Tunka -------------------------------------------------------------------------- MASTER II have 2 images per exposition time. The message may be cited. mailto: lipunov@sai.msu.ru