TITLE: GCN CIRCULAR NUMBER: 11897 SUBJECT: GRB 110407A: MASTER early optical observations DATE: 11/04/07 14:51:40 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk 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 K.Ivanov, S.Yazev, N.M.Budnev, E.Konstantinov, V.Lenok, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB110407 25 sec s after notice time and 107 sec after GRB time at 2011-04-07 14:08:28.65 UT. On our first (20s exposure) set we haven`t found optical transient within SWIFT-BAT error-box. The 5-sigma unfiltred upper limit has been about 17.8 mag MASTER II robotic telescope in Tunka also pointed on GRB110407 at same time in two polarizations. Unfortunately during this moment there was a strong clouds in the given direction and a upper limit very small. The message may be cited.