TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1531 SUBJECT: XRF 020903, optical observations DATE: 02/09/03 20:02:15 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia XRF 020903, optical observations ------------------------- P. Tristram (Univ. of Auckland) A. J. Castro-Tirado (IAA-CSIC, Granada) J. Gorosabel (IAA-CSIC, Granada) J. M. Castro Cerón (ROA, San Fernando) P. Kilmartin (Mt. John Univ. Observatory) Y. Furuta (Univ. of Nagoya) Ph. Yock (Univ. of Auckland) communicate: "Following the detection of the X-ray flash 020903 by HETE (Ricker et al. GCN Circ. 1530), we have imaged the entire error box with the 0.6-m (+MOA camera) at Mt. John Observatory in a wide B- and wide R-band filters (600-s and 1200-s respectively) starting on Sep 3.5944 UT (i.e. 4.18 hr after the event). Comparison of the frames with the DSS-2 (R-band) reveals no optical transient down to the DSS-2 limiting magnitude."