GCN Circular 12613
Subject
GRB 111123A: optical upper limit in CrAO
Date
2011-12-04T16:11:41Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
We observed the field of GRB 111123A (Stamatikos et al. GCN 12587) with
Shajn telescope of CrAO observatory on Nov. 25 between (UT) 02:48 and 03:44
under a mean seeing of 2.0 arsces and large airmass. We took several frames
with exposure of 60 s in I-band. Within enhanced Swift-XRT position (Goad et
al. GCN 12590) we do not detected the optical counterpart (Xu et al., GCN
12589; Fugazza et al., GCN 12593). A photometry is based on the USNO B1.0
star 0693-0243552 (10 19 20.57, -20 39 18.7, J2000) assuming I=16.85.
T_start UT T0+ Filter, Exposure, OT, uplim (3 sigma)
(mid, d) (s)
02:48:33 1.89584 I 49x60 n/d 22.2