TITLE: GCN CIRCULAR NUMBER: 18877 SUBJECT: GRB 160117B: MASTER-Amur OT observations DATE: 16/01/17 15:09:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University 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 A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik Kislovodsk Solar Station of the Pulkovo Observatory D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory 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) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB160117B (Sonbas et. al. GCN 18875) and made first exposition 19 sec after notice time and 35 sec after trigger time at 2016-01-17 14:04:35 UT. But due to some problem with mount on strong frost (-40 deg) we have a ~4 deg. poining error and do not cover GRB160117B error box. We correct this error and made first (60 sec exposure) image with GRB160117B error box at 2016-01-17 14:21:31 i.e. 1323 sec. after the trigger with upper limit 17.0. On one of coadd image (with total exposure 180 sec, 1696 sec after the trigger) we see GRB160117B optical counterpart (Sonbas et. al. GCN 18875) with 17.5 mag. All magnitudes are unfiltered (0.2B+0.8R) with respect to number USNO B1.0 stars. The message may be cited.