TITLE: GCN CIRCULAR NUMBER: 14137 SUBJECT: GRB 130102B: MASTER synchronous observations DATE: 13/01/05 14:27:55 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, V. Lipunov, V. Kornilov, D. Denisenko, A. Kuznetsov, D. Kuvshinov, A. Belinski, 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://93.180.27.230:8080/) were imaging the sky area of MAXI/GSC GRB 130102B (M. Higa et al., GCN 14130) before, during and after trigger time with 2 sec exposures without time gap. Elevation of center of GRB error box at the moment of MAXI/GSC trigger was 16 deg. We have covered the whole interval of gamma-ray activity by KONUS-WIND (Golenetski et al., GCN 14135) which corresponds to T-20 sec to T+10 sec from MAXI/GSC trigger time. We haven't found optical transient within MAXI/GSC error box on our 2-s frames and on the coadded image made of 15 frames and total exposure of 30 seconds. The 3-sigma upper limit (with the reference to V magnitudes from Tycho-2 catalog) has been about 10.0 mag on single images and 11.5 mag on coadded image. The reduction of the whole data set is continuing. This message can be cited.