GCN Circular 8689
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.