GCN Circular 4613
Subject
GRB050121: optical observation
Event
Date
2006-01-28T02:21:35Z (20 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@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 GRB051221 (Parsons et al., GCN 4363, Cummings et
al., GCN 4365) with 1.5m telescope of Maidanak Astronomical Observatory on
Dec. 22 between (UT) 14:51 and 15:26. The source detected in J (Bloom, GCN
4367, 4368) and r (Berger et al., GCN 4369) is also detected in our stacked
R-image in the position (J2000) RA = 21 54 48.67, Dec = +16 53 27.53 with
an uncertainty in both coordinates of 0.3 arcsec. A photometry of the source
is following:
Obs. time, Exposure, R (mag), Mag.(UL), Seeing
(UT) (s)
Dec.22 14:51-15:26 1800 21.76+/-0.13 22.4 1.3"
(Astrometry and photometry reduction is based on USNO-B1.0). Using host
galaxy brightness obtained in astro-ph/0601455 (Soderberg et al.) we
estimate brightness of optical transient of short GRB050121 at 1.55 days
after the burst as R=23.00 +/- 0.35.
Combined images can be found at
http://grb.rssi.ru/GRB051221/grb051221_051222_R_AZT22.gif
The message may be cited.