[vsnet-grb-info 13245] GRB 130427A: optical observations in CrAO

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14582
SUBJECT: GRB 130427A: optical observations in CrAO
DATE:    13/05/05 22:29:40 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

V. Rumyantsev (CrAO), K.Antoniuk (CrAO),  D. Shakhovskoy (CrAO), A. 
Pozanenko (IKI) report on  behalf of larger GRB follow-up collaboration:

We continue observation of the Swift GRB 130427A (Maselli et  al., GCN 
14448)  with AZT-11 telescope of CrAO observatory. Preliminary 
photometry the optical afterglow of GRB 130427A (Maselli et al., GCN 
14448, Elenin et al. GCN 14450, Perley GCN 14451) is following

T_start (UT)             T0+     Filter Exp.  OT
                          mid,days       s     mag
2013-05-02T19:34:45.35   5.5618  R      6120  19.75 +/- 0.15
2013-05-03T20:41:27.17   6.5581  R      3600  20.30 +/- 0.25
2013-05-04T18:26:22.25   7.4747  R      5400  20.20 +/- 0.18

Photometry is based on SDSS star
SDSS id             B      eB    V      eV    R      eR    I      eI
J113220,11+274133,5 17,421 0,020 16,911 0,020 16,561 0,015 16,124 0,016