TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2314 SUBJECT: XRF 030723, optical observations DATE: 03/07/23 23:55:59 GMT FROM: Alberto Castro-Tirado at LAEFF-INTA XRF 030723, optical observations ------------------------- A. de Ugarte (IAA-CSIC, Granada), P. Tristram (Univ. of Auckland), T. Sekiguchi (Univ. of Nagoya), M. Jelinek (ASU-CAS, Obs. Ondrejov), J. Gorosabel (IAA-CSIC and STScI, Baltimore), S. Guziy (IAA-CSIC), J. M. Castro Cerón (STScI), P. Kilmartin (Mt. John Obs.), Ph. Yock (Univ. of Auckland) and A. J. Castro-Tirado (IAA-CSIC) communicate: "Following the detection of the X-ray flash 030723 by HETE-2, we have imaged the entire error box with the 0.6-m telescope (+MOA camera) at Mt. John Observatory in wide R- and B-band filters (3 x 300-s each) starting on July 23.59 UT (i.e. 7.6 hr after the event). Comparison of a single R-band frame with the DSS-2 (R- -band) reveals no optical transient down to the DSS-2 limiting magnitude."