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GCN Circular 14322

Subject

GRB 130313A: optical upper limit in CrAO

Date

2013-03-16T19:54:45Z (11 years ago)

From

Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>

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

We observed the field of the Swift GRB 130313A (Gompertz  et al., GCN 
14293Not found
 
 
) with ZTSh telescope of CrAO observatory (Mondy) on March 14
between (UT) 00:23:52 - 02:11:00. We took several images in R-filter of 60 
s exposure which cover  the  refined BAT error box (Barthelmy et al., GCN 
14296Not found
 
 
). Within  XRT position (Gompertz et al., GCN  14297Not found
 
 
; Osborne et al., 
GCN  14300Not found
 
 
) we do  not detect any source. Preliminary photometry of a 
combined image is following

UT start,    t-t0           filter      Exp.   OT      UL (3 sigma)
             (mid, days)                (s)

00:23:52    0.3818        R     24x60   n/d     22.7

The photometry is based on USNO-B1.0  star
0896-0256107 15:45:37.83 -00:22:18.2 R=16.04