GCN Circular 12290
Subject
GRB 110820A: CrAO optical upper limit
Date
2011-08-20T22:17:57Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev, K. Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of the Swift GRB 110820A (Troja et al., GCN 12288)
with AZT-11 telescope of CrAO between Aug. 20 (UT) 18:23
- 19:21. Within the XRT error box (Troja et al., GCN 12288) we do not
detect any source. The photometry is based on the USNO B1.0 star
1602-0161058 (22:52:45.06 +70:17:17.5) assuming R=18.23:
T0+ Filter, Exposure, OT, Upper Limit (3 sigma)
(mid, d) (s)
0.0520 R 20x180 n/d 21.6