TITLE: GCN CIRCULAR NUMBER: 15946 SUBJECT: GRB 140311A: MASTER early optical observations DATE: 14/03/11 21:53:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, M. Pruzhinskaya, D.Denisenko, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Kuvshinov Lomonosov Moscow State University, Sternberg Astronomical Institute K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB140311A 27 sec after trigger time and 127 sec after trigger time at 2014-03-11 21:07:23 UT in two polarizations. On our first (30s exposure) set we haven`t found optical transient within SWIFT error-box (Racusin et. al GCN 15944). The 5-sigma upper limit has been about 16.27mag MASTER II robotic telescope located in Blagoveschensk was pointed to the GRB140311A 10 sec after notice time and 89 sec after trigger time at 2014-03-11 21:06:45 UT in two polarizations. On our first (20s exposure) set we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 14mag. The observations made on the morning sky. The message may be cited.