TITLE: GCN CIRCULAR NUMBER: 15701 SUBJECT: GRB 140108A: MASTER-Net OT detection DATE: 14/01/08 18:08:50 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, D.Denisenko, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov 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, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University 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 Kislovodsk was pointed to the GRB140108A 22 sec after notice time and 39 sec after trigger time at 2014-01-08 17:19:21.913 UT in two polarizations. On our first (10s exposure) set we haven`t found optical transient within SWIFT error-box ( Racusin et al. GCN 15699 ). The 5-sigma upper limit has been about 17.0 mag. MASTER II robotic telescope located in Blagoveschensk was pointed to the GRB140108A 30 sec after notice time and 47 sec after trigger time at 2014-01-08 17:19:29.211 UT in two polarizations. On our first (10s exposure) set we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 16.0 mag. The polarizations filters oriented by RA and DEC axis (0 and 90 degrees from RA axis) in Kislovodsk, and 45 and 135 degrees from RA axis in Blagoveschensk. The OT candidate apeared in two sites (Blagoveschensk and Kislovodsk) and at 2014-01-08 17:19:42 at position: (J2000) RA = 21 40 26.77 Dec = +58 44 41.4 Error=+-1 arcsc sigma The message may be cited.