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GCN Circular 8689

Subject
GRB 081221: further NOT observations
Date
2008-12-21T22:12:49Z (15 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@astro.ku.dk>
Daniele Malesani, Johan P. U. Fynbo (DARK/NBI), Tapio Pursimo (NOT), and 
Eric Stempels (Univ. St. Andrews) report on behalf of a larger 
collaboration:

Further to what reported in GCN 8688, we observed the field of GRB 
081221 (Hoversten et al., GCN 8687) in the I and z filters with the NOT 
equipped with ALFOSC. Exposure times were 18 and 16 min, respectively, 
with mean times Dec 21.844 and Dec 21.863 UT (3.89 and 4.37 hr after the 
GRB, respectively).

Inside the XRT error circle reported by Hoversten et al. (GCN 8687), we 
do not detect any source in either filters. The limiting magnitude is I 
~ 23 assuming I = 17.65 for the USNO star at RA = 01:03:09.59, Dec = 
-24:32:45.0.

We encourage deeper searches of the optical/NIR counterpart of this 
event, which had a bright gamma- and X-ray prompt emission.
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