GCN Circular 12617
Subject
GRB 110921A: optical observations in Maidanak observatory
Date
2011-12-04T20:50:27Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (SAI MSU), M. Ibrahimov (UBAI), A. Pozanenko (IKI) report on
behalf of larger GRB follow-up collaboration:
We update results of Maidanak observations preliminary reported in GCN
12380.
We observed the field of the Swift GRB 110921A (Baumgartner et al., GCN
12373) with AZT-22 telescope of Maidanak observatory starting Sep. 21 (UT)
17:45:30. Several images in R-filter of 300 s exposure were taken under
moderate seeing (FWHM ~ 1.7"). We detect a source in coordinates (J2000) 19
36 23.363 +36 19 43.02 with uncertainty of 0.2" and brightness of R = 22.0
+/- 0.15. This source is rather consistent both in position and brightness,
with the SDSS object (Xu et al. GCN 12385; Vreeswijk et al. GCN 12387).
So we do not detect afterglow reported by (Xu et al. GCN 12385; Breeveld et
al. GCN 12389; Tokoyoda et al. GCN 12410; Volnova et al. GCN 12438).
Tstart UT, T0+, Filter, Exposure, OT, Upper Limit (3 sigma)
(mid, d) (s)
17:45:30 0.17895 R 8*300 n/d 22.5