GCN Circular 12576
Subject
GRB 111117A: optical upper limit in CrAO
Event
Date
2011-11-20T15:51:37Z (14 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev, N. Pit (CrAO), A. Pozanenko (IKI) report on behalf of larger
GRB follow-up collaboration:
We observed field of the Swift GRB 111117A (Mangano et al. GCN 12559)
with AZT-11 telescope of CrAO in R filter between Nov. 17 (UT) 16:11:05 -
17:14:24, i.e. starting ~ 4 h after burst trigger. We took several images of
180 exposure under variable weather conditions and mean seeing (FWHM) of
about 2.7". We do not detect any source within XRT position (Melandri et
al. GCN 12565). A photometry is based on the USNO B1.0 1130-0013895 star
(00:50:46.48 +23:01:28.8) assuming R=16.98:
T0+ Filter, Exposure, OT, UpperLimit
(mid, d) (s)
0.1879 R 22x180 n/d 20.6