TITLE: GCN GRB OBSERVATION REPORT NUMBER: 688 SUBJECT: GRB000604, optical observations, comparison with DPOSS DATE: 00/06/06 18:53:44 GMT FROM: Alan H. Diercks at Caltech I. Cotoros, A. Mahabal, S. Yost, and A. Diercks report on behalf of the Caltech-NRAO-CARA GRB collaboration: "We imaged the entire IPN error region of GRB000604 (Hurley et al, GCN #687) with the Palomar 60" telescope from June 6.24 - 6.28 UT. The error region was covered by two pointings with three 500s integrations in Gunn-r at each pointing. Although the seeing was rather poor (1.5" FWHM), the combined frames are significantly deeper than DPOSS (Djorgovski, astro-ph/9809187) images of the field (limiting magnitude Gunn-r~20.5). Visual inspection of the IPN error region reveals no new objects above the DPOSS limit." This message may be cited.