GCN Circular 3004
Subject
GRB 050128 Optical observation with REM
Date
2005-02-01T19:14:52Z (19 years ago)
From
Angelo Antonelli at Obs. Astro. di Roma <a.antonelli@mporzio.astro.it>
A. Melandri, E. Palazzi, L. A. Antonelli, S. Covino, P. D'Avanzo,
G. Tagliaferri, G. Chincarini, F. M. Zerbi, G. Tosti, A. Monfardini,
N. Masetti, L. Nicastro, G. Cutispoto, E. Molinari, M. Rodono' and
F. Vitali on behalf of the REM/ROSS team, report:
"We imaged the field of GRB050128 (Antonelli, et al., GCN 2991) with
the 60cm REM robotic telescope located in La Silla (Chile).
Optical observations were carried out in V, R, I filters starting on
2005
Jan 28, at 7:10 UT, and ending at 9:45 UT (approximately 3 hours after
the burst) . Observations have been partly affected by the presence
of the bright Moon close to the field, so only frames with short
exposure
time can be used. The field was imaged in each filter for a total
exposure
time of 50s.
No new sources are detected within the XRT error circle (Antonelli et
al. GCN 2991) down to a limiting magnitude of V >18.2, R >18.2 and
I >17.9.
The source noted in the H band (Covino, et al., GCN 2999) at RA=
14:38:18.16, DEC=-34:45:44.7 (J2000) at about 13 arcsec far from the
XRT position is not visible in the optical bands. We derive a 3-sigma
upper limit of R > 18.2 at the position of this source.
Further optical-infrared observations with REM are planned to look for
any variability.
This message can be cited."