GCN Circular 6700
Subject
GRB 070802: Confirmation of the optical afterglow
Date
2007-08-02T17:55:59Z (18 years ago)
From
Daniele Malesani at Niels Bohr Inst,Dark Cosmology Center <malesani@astro.ku.dk>
D. Malesani, J.P.U. Fynbo, J. Hjorth, and P.M. Vreeswijk (DARK) report
on behalf of a larger collaboration:
We report further analysis of our images (Malesani et al., GCN 6696) of
GRB 070802 (Barthelmy et al., GCN 6692). Observations span the range
08:01 - 10:09 UT, that is 0.9 - 3.0 hr after the GRB. The object
reported by Greiner et al. (GCN 6694) and Berger & Murphy (GCN 6695) is
well detected in all our images, and is clearly fading following a
power-law decay with index alpha = 0.6+-0.1. Based on instrumental
zeropoints, the afterglow looks significantly reddened, with a color R-I
= 0.55+-0.1.
We acknowledge excellent support from the VLT staff.