TITLE: GCN CIRCULAR NUMBER: 14474 SUBJECT: GRB 130427A: optical observations in CrAO DATE: 13/04/27 21:13:31 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova ( IKI), D. Shakhovskoy (CrAO), V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We started observation of the field of the Swift GRB 130427A (Maselli et al., GCN 14448) with AZT-11 telescope of CrAO observatory on Apr. 27 (UT) 18:21:45 in VRI filters. We clearly detect still bright optical counterpart of GRB 130427A (Maselli et al., GCN 14448, Elenin et al. GCN 14450, Perley GCN 14451). Preliminary photometry is following filter tstart (UT) exp,s T-t0,d OT +/- err R 18:21:45 120 0,76580 16,71 +/- 0,06 R 18:27:52 120 0,77005 16,87 +/- 0,06 R 18:34:00 120 0,77431 16,83 +/- 0,07 R 18:40:07 120 0,77855 16,81 +/- 0,06 Observation is continuing.