GCN Circular 4379
Subject
GRB 051221B: BOOTES optical observations.
Date
2005-12-22T01:36:01Z (19 years ago)
From
Javier Gorosabel at Danish Space Res Inst <jgu@spacecenter.dk>
A. de Ugarte Postigo, M. Jelinek, S. Vitek, A.J. Castro-Tirado,
J. Gorosabel, S.B. Pandey, S. Guziy (IAA-CSIC, Granada), P. Kubanek and
R. Hudec (Astronomical Institute of the Academy of Sciences, Ondrejov),
report:
"BOOTES-1 in South Spain (El Arenosillo, INTA, Huelva), responded under
non-optimal conditions to GRB 051221 (Swift trigger 173904, Boyd et al.
GCNC 4376). A sequence of RVI-band exposures started at 20:07:15 UT
(235s after the GRB onset). Preliminary analysis does not reveal any
transient optical source in the 3' radius SWIFT/BAT error box, and in
particular at the position reported by SWIFT/XRT (Page et al. GCNC
4378). We set the following R-band upper limits:
=============================================
T-To (s) Exp. Time Lim. Mag. R-band
Mid Exposure (s) (3 sigma)
---------------------------------------------
235 5 14.5
307 10 16.0
353 6x10 16.5
665 5x100+12x10 18.5
=============================================
We notice an important Galactic extinction in the GRB line of sight
(E(B-V)=1.39, Schlegel et al. 1998)"