TITLE: GCN CIRCULAR NUMBER: 16507 SUBJECT: GRB 140703A: MASTER optical observations DATE: 14/07/03 10:11:14 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya, P.Balanutsa, V.Kornilov, D.Kuvshinov, N.Tyurina, 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, A. Gabovich 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 GRB 140703A (Kocevski et. al., GCN 16503) 2 sec after notice time and 45 sec after trigger time at 2014-07-03 00:38:03 UT on morning sky in two polarizations. We have 10 good frames with an increasing exposition from 10 to 70 seconds that of that as there overlighting came. On our first (10s exposure) set we haven`t see optical transient (Cunniffe et. al., GCN 16504; Castro-Tirado et. al., GCN 16505) on our single and coadd image. Pro.type T-T_trig T_start Exp.time Limit Filt. Tube. (mean) (UT) Alert 51 00:38:03 10 15.9 P- EAST Alert 51 00:38:03 10 15.7 P| WEST Coadd 77 00:38:03 40 16.8 P- EAST Coadd 77 00:38:03 40 16.5 P| WEST Coadd 169 00:38:03 180 16.7 P| WEST Coadd 244 00:38:03 310 17.5 P- EAST Coadd 244 00:38:03 570 18.0 White WEST+EAST Alert 72 00:38:24 10 15.9 P- EAST Alert 72 00:38:24 10 15.8 P| WEST Alert 98 00:38:45 20 16.0 P| WEST Alert 98 00:38:45 20 16.2 P- EAST Alert 129 00:39:16 20 15.7 P| WEST Alert 129 00:39:16 20 16.2 P- EAST Coadd 174 00:39:16 90 17.1 P- EAST Coadd 174 00:39:16 90 16.4 P| WEST Alert 164 00:39:47 30 16.4 P- EAST Alert 164 00:39:47 30 15.7 P| WEST Alert 210 00:40:27 40 15.7 P| WEST Alert 210 00:40:27 40 16.5 P- EAST Alert 266 00:41:18 50 15.5 P| WEST Alert 266 00:41:18 50 16.4 P- EAST Coadd 342 00:41:18 80 16.5 P- EAST The message may be cited. [GCN OPS NOTE(03jul14): As per GCN Circ 16508, the Subject-line was changed from 140629A to 140703A.]