TITLE: GCN CIRCULAR NUMBER: 7666 SUBJECT: GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst DATE: 08/05/03 13:22:34 GMT FROM: Daniel Perley at U.C. Berkeley D. A. Perley (UC Berkeley), D. Lai, C. Rockosi (UCSC/Lick), and J. S. Bloom (UC Berkeley) report: After the GRB alert we slewed to the position with the Keck I telescope, equipped with LRIS. We detect a possible new source at a position consistent with the XRT position in the LRIS guider camera near the detection limit of the guider (~20-21st mag). Spectroscopic observations began at ~13:01 UT. Results will be reported in forthcoming circulars.