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GCN Circular 12615

GRB 111123A: optical upper limit in CrAO: correction to the GCN circ. 12613
2011-12-04T16:57:12Z (12 years ago)
Alexei Pozanenko at IKI, Moscow <>
The text of the GCN circular  #12613 should be corrected as following. I 
apologize for possible inconvenience.

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

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
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