TITLE: GCN CIRCULAR NUMBER: 19089 SUBJECT: GRB 160225A: MASTER-Amur observations DATE: 16/02/26 09:27:38 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs N.Tyurina, E. Gorbovskoy, V. Lipunov, V.Kornilov, P.Balanutsa, A.Kuznetsov, D.Kuvshinov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A.Gabovich, V.Yurkov, Yu.Sergienko, D.Varda Blagoveschensk Educational State University, Blagoveschensk D.Buckley, S. Potter, M.Kotze South African Astronomical Observatory K.Ivanov, N.M.Budnev, O.Gres, V.A.Poleshchuk Irkutsk State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian The Instituto de Astrofisica de Canarias MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB160225A 20 sec after notice time and 204 sec after Swift BAT trigger (Siegel et al, 19075) time at 2016-02-25 14:24:20 UT (Gabovich et al, 19076). We did not see any OT brighter 2-sigma. Our unfiltered camera sensitive up to 10 mk. Id t_start-t_trigger t_mean-t_trig Exp.time Limit s s s unfiltered 767291 204 224 40 17.4 767293 256 281 50 17.6 767295 318 348 60 17.0 769139 318 768 600 18.7 769244 318 1187 1200 19.0 Our unfiltered magnitude calibrated to USNOB1 stars as m =0.2B + 0.8R . The message may be cited.