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GCN Circular 13988

Subject
GRB 121123A: optical observations
Date
2012-11-24T01:50:55Z (12 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (SAO MSI, IKI), A. Stepura (UAFO), A. Matkin (UAFO),  D. 
Erofeev (UAFO), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf 
of larger GRB follow-up collaboration:

We observed the field of the Swift GRB 121123A (Helder et al., GCN 
13982) with VT-50 (0.5-m) telescope and GAS-250 of UAFO/ISON-Ussuriysk 
observatory starting on Nov. 23 (UT) 10:10:15, i.e. 6 minutes after 
burst trigger. We took several unfiltered images of 30 s. We do not 
detect detect afterglow (Helder et al., GCN 13982; Zhao et al., GCN 
13983) in a stacked images. Preliminary photometry of a stacked image 
obtained with VT-50 is based on USNO-B1.0 stars (R2):

T_start  T0+,    Filter, exposure, UL (3 sigma)
(UT) mid (d)     (s)

10:10:15 0.02793 none    90x30     18.1
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