[vsnet-grb-info 13949] GRB 130925A: optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15263
SUBJECT: GRB 130925A: optical upper limit
DATE:    13/09/27 10:43:49 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the  field of GRB 130925A (Lien, et al., GCN 15246) with 
AZT-8 (0.7m) telescope of Gissar observatory in R filter starting on 
Sep. 25 (UT) 22:15. We do not detect optical afterglow (Sudilovsky et 
al., GCN 15247). A preliminary photometry of combined image is following

T_start              T0+       Filter, Exposure, OT,  UL(3 sigma)
(UT)                 (mid, d)            (s)

2013-09-25T22:16:55  0.7766    R       60x60     n/d  19.9


The photometry is based on the reference star USNO-B1.0 0638-0038928
RA 02:45:02.36 Dec -26:10:50.2 (J2000), assuming R = 17.07