TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4646 SUBJECT: GRB 060203: P60 Confirmation of Optical Afterglow DATE: 06/02/04 04:07:04 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko, E. Ofek, A. M. Soderberg (Caltech), N. Cucchiara, D. B. Fox (Penn State) report on behalf of a larger collaboration: We have imaged the error circle of the possible Swift GRB060203 (Retter et al., GCN 4641) with the automated Palomar 60-inch telescope. Observations consisted of 5 x 150 images in the Kron R filter, taken at a mean epoch of approximately 03:38 UT February 4th. Inside the XRT error circle, we find the afterglow candidate proposed by Malesani et al. (GCN 4645). Furthermore, we find that since the observations described in Piranomonte et al. (GCN 4643), the object has faded. The approximate magnitude in our images, calibrated with respect to the USNOB-2 catalog, is 21.3 +/- 0.3. We therefore conclude this source is the optical afterglow of GRB060203.