GCN Circular 3657
Subject
GRB 050721: optical afterglow confirmed
Date
2005-07-21T06:59:54Z (20 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
S. Covino, P. D'Avanzo (INAF/OABr), S. Bagnulo, T. Szeifert (ESO), D.
Malesani (SISSA), G. Tagliaferri (INAF/OABr), G. Chincarini (Univ.
Milano-Bicocca), S. Piranomonte, L.A. Antonelli, and L. Stella
(INAF/OAR), on behalf of the MISTICI collaboration, report:
We observed the field of GRB 050721A (Antonelli et al., GCN 3654) with
the ESO-VLT UT2. Observations were carried out with the FORS1 instrument
in the R filter, starting on 2005 Jul 21, 4:54 UT (~25 minutes after the
GRB) and are still in progress.
Inside the XRT error box, we find a fiding source at the approximate
coordinates:
alpha = 16:53:44.53
delta = -28:22:51.8
with an error of ~1".
This lies 1.1" E, 0.7" N of the USNO star U0600_22125777, and is likely
the same source reported by Torii (GCN 3655).
This rapid response by an 8m-class telescope was possibile thanks to the
special Rapid Response Mode provided by ESO.
This message can be cited.