[vsnet-grb-info 2775] GRB050121b: optical observation

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4612
SUBJECT: GRB050121b: optical observation
DATE:    06/01/28 02:17:21 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

D. Sharapov (MAO, and NOT La Palma),  M. Ibrahimov (MAO), A. Pozanenko
(IKI), V. Rumyantsev (CrAO) on behalf of larger GRB follow up collaboration
report:

We observed  error box of  GRB051221b (Boyd et al., GCN 4376) with 1.5m
telescope of Maidanak Astronomical Observatory on Dec. 22 between (UT) 15:41
and 16:06. A set of 7x180 s images were obtained in R-band. We do not detect
the object at the location of the candidate optical counterpart reported by
Halpern & Tyagi (GCN 4381). Limiting magnitude of the stacked image is based
on USNO-B1.0:

Obs. time,           Exposure,  mag.(UL),Seeing
(UT)                 (s)

Dec.22 15:41 - 16:06 1260       22.3     1.2"

Combined images can be found at

http://grb.rssi.ru/GRB051221b/grb051221b_051222_R_AZT22.jpg

The message may be cited.