TITLE: GCN GRB OBSERVATION REPORT NUMBER: 660 SUBJECT: GRB000424, optical observations DATE: 00/05/02 16:51:39 GMT FROM: Sarah Yost at Caltech S. Yost, A. Diercks, F. Harrison, R. Gal, V. Hradecky, D. Kaplan, A. Mahabal, P. Mao (Caltech) report: "We imaged the entire error circle of GRB000424 (Piro, GCN #644) with the CCD 13 instrument on the Palomar 60" telescope on two consecutive nights. Exposures consisted of R-band 6x600s on April 27.17 UT and 7x600s on April 28.19 UT with seeing of approximately 1.5" and 1" respectively. Subtraction of the two epochs reveals no variable candidates to the detection limit of approximately R ~ 22.8 (field calibration by comparison with USNO data)." This message may be cited.