[vsnet-grb-info 13137] GRB 130427A: optical observations in CrAO

[GCN Circulars]

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  <apozanen at iki.rssi.ru>

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.