TITLE: GCN CIRCULAR NUMBER: 11791 SUBJECT: GRB 110315A: MASTER early optical observations DATE: 11/03/16 09:37:25 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, A.V.Krylov, V.Shumkov, S.Shurpakov 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 V.Krushinski, I.Zalozhnich, 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 MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB110315A (Melandri et al., GCN 11790) 44 sec s after notice time and 89 sec after GRB time at 2011-03-15 23:58:33.212 UT. On our first (20s exposure) set we haven`t found optical transient within SWIFT BAT error-box (ra=18 36 45 dec=+17 31 48 ). The 3-sigma upper limit has been about 17.3 mag The upper limit for 25 coadded images is 20.0 started 23:58:33.212 UT (mean time after trigger is 3240 sec ). The Galactic absroption in this direction is about 1 mag (Kalbela et al., 2005, A&A,440,775). The message may be cited. mailto: lipunov@sai.msu.ru