[vsnet-grb-info 7053] GRB 081203B: Additional Gemini imaging
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon Dec 8 14:07:40 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8637
SUBJECT: GRB 081203B: Additional Gemini imaging
DATE: 08/12/08 05:07:27 GMT
FROM: Daniel Perley at U.C. Berkeley <dperley at 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.
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