GCN Circular 8024
Subject
GRB 080727B: KAIT observations
Event
Date
2008-07-27T10:03:20Z (18 years ago)
From
Weidong Li at UC Berkeley KAIT/LOSS <weidong@astron.berkeley.edu>
W. Li, R. Chornock, D. A. Perley, J. S. Bloom, and A. V. Filippenko,
University of California at Berkeley, on behalf of the KAIT
GRB team, report:
The robotic 0.8-m KAIT located at Lick Observatory responded to
GRB 080727B (Immler et al. GCN 8022) automatically on July 27
starting at 08:14:12 UT (48 seconds after the burst). A series of
images were taken in the V, I, and clear filters. We detected a
fading new object at the following location:
RA (J2000) = 18h27m26.05s +/- 0.3"
Dec (J2000) = +01d09'47.7" +/- 0.3" ,
suggesting that this is the optical afterglow of the GRB.
We report the following preliminary photometry (calibrated
to USNO B1):
UT start exptime filter mag err
08:14:12 2 s clear 18.20 0.16
08:14:17 2 s clear 18.38 0.16
08:14:20 2 s clear 18.45 0.23
The power-law decay index between t = 49 s and 72 s after the
burst is -1.44 +/- 0.59. Further analysis is ongoing.