TITLE: GCN CIRCULAR NUMBER: 14970 SUBJECT: Fermi GBM trigger 394416326: MASTER early optical limit DATE: 13/07/03 16:24:15 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs H. Levato and C. Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) C. Mallamaci, C. Lopez and F. Podest Observatorio Astronomico Felix Aguilar (OAFA) E. Gorbovskoy, D. Denisenko, V. Lipunov, V. Kornilov, A. Kuznetsov, D. Kuvshinov, N. Tyurina, N. Shatskiy, P. Balanutsa, D. Zimnukhov, V.V. Chazov Lomonosov Moscow State University, Sternberg Astronomical Institute A. Tlatov, A.V. Parhomenko, D. Dormidontov, V. Sennik Kislovodsk Solar Station of the Pulkovo Observatory 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 V. Krushinski, I. Zalozhnich, A. Popov, A. Bourdanov, A. Punanova Ural Federal University MASTER-ICATE robotic very wide field cameras (FOV=2x384 square degrees, D=72mm, f/1.2, 1 pix = 22 arcsec, http://observ.pereplet.ru) located in Argentina (Observatorio Astronomico Felix Aguilar, http://master.sai.msu.ru:8080/) were pointed to the Fermi-GBM trigger 394416326 55 sec after GRB time and 49 sec FERMI trigger Time at 2013-07-02 00:06:18 UT. We haven't found optical transient (Singer et. al. GCN 14967) on single (exp = 5 sec) images with upper limit V<11m and coadded image made of first 58 frames (5 sec exposure without time gap) and total exposure of 290 seconds with upper limit V<12.5m. Our magnitudes are calibrated against V magnitudes from Tycho-2 catalog. This upper limit does not contradict the power law decay with an index of 0.54 inferred by Singer et al. in GCN 14967. The reduction of the whole data set is continuing. This message can be cited.