TITLE: GCN CIRCULAR NUMBER: 12066 SUBJECT: GRB 110610A: MASTER-NET optical observations DATE: 11/06/10 15:52:40 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev,E.Konstantinov, Irkutsk State University 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.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 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 GRB110610.64 30 sec s after notice time and 55 sec after GRB time at 2011-06-10 15:22:27.062 UT. On our first (10s exposure) set we haven`t found optical transient within SWIFT error-box (ra=20 32 35 dec=+74 49 11 r=0.050000). The 5-sigma upper limit has been about 15.0 mag The message may be cited.