[vsnet-grb-info 13872] GRB 130831A: optical observation in Gissar AO

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15186
SUBJECT: GRB 130831A: optical observation in Gissar AO
DATE:    13/09/07 23:43:47 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Volnova (IKI), N. Minikulov (Institute of Astrophysics), M.Gulyamov 
(Institute of Astrophysics), I. Molotov (KIAM), A. Pozanenko (IKI) 
report on behalf of  larger GRB follow-up collaboration:

We observed the afterglow  (Hagen et al., GCN  15139; Guidorzi et al., 
GCN 15140) of the Swift GRB 130831A (Hagen et al., GCN  15139)  with 
AZT-8 (0.7m) telescope of Gissar observatory in R filter starting on 
Aug. 31 (UT) 17:47:54. A preliminary photometry of combined image is 
based on  SDSS DR9 stars

T_start              T0+       Filter, Exposure, OT,    OT_err
(UT)                 (mid, d)            (s)

2013-08-31T17:47:54  0.21932   R       57x60     18.28  0.04

Reference stars SDSS-DR9, (R mag, transformation by Lupton 2005)

N	SDSS id			R(Lupton)errR
1	J235443.71+292539.3	13.491	 0.016
2	J235438.60+292547.3	14.136	 0.015
3	J235423.64+292452.8	17.120	 0.016