TITLE: GCN CIRCULAR NUMBER: 7254 SUBJECT: GRB 080205: OA evolution from KAIT observations DATE: 08/02/05 16:25:04 GMT FROM: Alex Filippenko at UC Berkeley W. Li, D. Perley, and A. V. Filippenko, University of California, Berkeley, on behalf of the KAIT GRB team, report: We report further analysis of the KAIT observations of GRB 080205 (Swift Trigger 302506; Markwardt et al. GCN 7250) announced by Li et al. (GCN 7251). Preliminary reduction of the unfiltered data shows that the optical afterglow (OA) has a nearly constant brightness of mag 18.1 from t = 65 s to 90 s, declines to mag 19.1 by t = 171 s, rises to mag 16.9 by t = 537 s, and has a steep power-law decline (with index around -1.6) thereafter until at least t = 50 min. The OA is also detected in multiple I-band and V-band images, suggesting that the redshift of the GRB is lower than roughly 4 or 5. The overall behavior of the OA of GRB 080205 is similar to that of GRB 060206 (Monfardini et al. 2006, ApJ, 648, 1125). This message may be cited.