GCN Circular 6839
Subject
GRB 071003: P60 Confirmation of Optical Afterglow
Date
2007-10-03T10:58:39Z (17 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. B. Cenko (Caltech) and D. B. Fox (Penn State) report on behalf of a
larger collaboration:
We have imaged the field of GRB071003 (Schady et al., GCN 6837) with the
automated Palomar 60-inch telescope. Observations began approximately 3
minutes after the burst (~ 07:44 UT 10 October) and were taken at high
airmass (~ 2.5). At the location of the optical afterglow candidate (Li,
GCN 6838) we detect a fading source in the g, R, i', and z' filters.
While photometry is complicated by the nearby bright star (Li, GCN 6838),
we estimate a magnitude of R ~ 14.5 in our first 60 s image (photometric
calibration was performed relative to several nearby objects from the
USNO-B catalog). The corresponding decay index is ~ -1.0.