TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5512 SUBJECT: GRB 060904A: P60 Observations DATE: 06/09/04 07:40:17 GMT FROM: S. Bradley Cenko at Caltech S. B. Cenko and A. Rau (Caltech) report on behalf of a larger collaboration: We have imaged the error circle of GRB 060904a (Grupe et al; GCN 5502) with the automated Palomar 60-inch telescope. Observations began at 4:57 UT 4 September (3.9 hours after the burst) and consisted of 12 x 180 s images in the Kron R and Sloan i' and z' filters. We find no sources inside the XRT error circle, to a limiting magnitude of R > 22.0 (estimated by comparison with several USNO-B objects in the field).