TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4698 SUBJECT: GRB060204A: Swift/UVOT observations DATE: 06/02/06 22:26:26 GMT FROM: Antonino Cucchiara at PSU A. Cucchiara, D. Fox, S. Hunsberger, A. Retter, J. Nousek (PSU), W. Voges (MPE), N. Gehrels (GSFC), on behalf of the Swift UVOT team. The Swift/UVOT began observing the field of GRB 060204A, detected by INTEGRAL (Mereghetti et al., GCN 4654) at 00:17:07 UT on 2006-02-05, 10.8 hours after the trigger. Within the XRT error circle reported by Morris et al. (GCN 4685) we found a DSS/USNO catalogued object (USNO B1 0505-0367492, B magnitude = 15.48). This is only 2 arcsecond from the XRT position. A preliminary analysis of this known source shows a fading behaviour followed by a rebrightening on a timescale of a day. For comparison, our B magnitude at the beginning of the observation was 14.14 (+/- 0.03), corrected for galactic extinction (E(B-V)=0.182)). At the moment, we cannot infer whether this is the optical afterglow of this GRB or a kind of activity due to the catalogued object. More XRT observations are ongoing to see if the XRT source fades away. Further analyses are forthcoming.