TITLE: GCN CIRCULAR NUMBER: 17279 SUBJECT: GRB 150103A: MASTER optical observations DATE: 15/01/04 13:53:58 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs D.Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory E. Gorbovskoy,V. Lipunov, N.Tyurina, P.Balanutsa, D.Denisenko, M.Pruzhinskaya, A.Kuznetsov, V.Kornilov, D.Kuvshinov, Lomonosov Moscow State University, Sternberg Astronomical Institute O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, V.A.Poleshchuk Irkutsk State University V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinsky, I.Zalozhnih, A. Popov Ural Federal University, Kourovka H. Levato and C. Saffe Instituto de Ciencias Astronomicas de la Tierra y del Espacio (ICATE), San Juan, Argentina C. Mallamacci, C. Lopez and F. Podest Observatorio Astronomico Felix Aguilar (OAFA), San Juan National University, Argentina MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in South Africa (Sutherland) was pointed to the GRB150103A 33 sec after notice time and 115 sec after trigger time at 2015-01-03 20:04:14 UT. On our first (20s exposure) set we haven`t found optical transient within SWIFT error-box (Hagen et al., GCN Circ 17269; Evans, GCN Circ 17270; Cummings et al., GCN Circ 17274; Stroh et al., GCN Circ 17277). The 5-sigma upper limit has been about 17.0mag This limit slightly yearly than Zadko (Klotz et al., GCN CIRC 17273) and Swift UVOT (Hagen, GCN CIRC 17275), but not contradict to them. This message may be cited.