GCN Circular 8637
Subject
GRB 081203B: Additional Gemini imaging
Date
2008-12-08T05:07:27Z (15 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
D. A. Perley (UC Berkeley) reports on behalf of a larger collaboration:
During morning twilight on 2008-12-07 UT (starting at 15:40) we
undertook additional imaging of the optical transient associated with
GRB 081203B, using GMOS on Gemini-North. We report the following
magnitudes:
g = 22.67 +/- 0.11 (t = 4.076 day)
r = 22.41 +/- 0.10 (t = 4.079 day)
i = 22.16 +/- 0.20 (t = 4.082 day)
Assuming a burst time of 13:52:02 UT (GCN 8600).
The SED is well-fit by a power-law with beta = 1.0 +/- 0.3. The
power-law index of the light curve compared with our r-band measurement
the previous night (GCN 8631) is alpha = 1.6 +/- 0.3. Both values are
consistent with typical late-time GRB afterglow behavior.
We thank the Gemini staff for conducting these observations, which were
carried out under program GN-2008B-Q-6.