TITLE: GCN GRB OBSERVATION REPORT NUMBER: 744 SUBJECT: GRB000630, optical observations DATE: 00/07/02 02:11:33 GMT FROM: Sarah Yost at Caltech S. Yost, F. Harrison and A. Burgasser (Caltech) report on behalf of a larger collaboration: "We imaged the entire error box of GRB000630 (Hurley, GCN 736) with the CCD 13 instrument of the Palomar 60". Exposures consisted of R-band 4X900 seconds on the half of the error box containing the positions of Bertolini et. al.'s optical candidate (GCN 737) and Berger & Frail's radio source (GCN 738), and 2X900 seconds on the other half, on July 1.23 UT. The seeing was approximately 0.9". Preliminary analysis reveals no objects at either the optical or the radio candidate positions, to an approximate limiting magnitude of R ~ 22.5. We will report a more precise limit after further calibration of the field." This message may be cited.