TITLE: GCN CIRCULAR NUMBER: 15746 SUBJECT: GRB 140103A: MASTER-Net early OT detection DATE: 14/01/16 15:20:24 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 Lomonosov Moscow State University, Sternberg Astronomical Institute 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 SWIFT GRB 140103A (V. Mangano et. al. GCN 15656) 22 sec after notice time and 303 sec after trigger time at 00:35:54 UT (Gorbovskoy et al., GCN 15660). We finaly processed our data and found faint optical afterglow on ours coadd images starting from t_0 + 303 sec (exp=240 sec) the position reported by Volnova et. al. ( GCN 15744). The afterglow have a local maximum near 1560 sec after the burst, which, in the principle, can be result of long plato-like X-ray activity. Out photometry data available at table below. t_start t_mid t_finish t-t0 Exp. Mag. S/N coadd --------+----------+---------+------+-----+-------+---+----- 00:35:45 00:36:45 00:37:59 458 240 19.4 3.6 3 00:35:45 00:36:45 00:41:50 689 670 20.2 2.6 6 00:40:24 00:42:24 00:44:09 828 430 <20.7 --- 3 00:38:33 00:40:13 00:44:50 869 710 20.3 3.0 5 00:51:29 00:54:29 00:56:23 1562 540 19.8 4.3 3 00:48:06 00:51:06 00:58:08 1667 1080 20.2 3.8 6 01:08:39 01:11:39 02:11:41 6080 6660 22.0 2.5 37 The light curve available here http://master.sai.msu.ru/static/GRB/GRB140103A.png The message may be cited.