TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2335 SUBJECT: GRB 030725: optical observations. DATE: 03/07/29 18:40:59 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid C. Vinter, S. Jorgensen (U. Copenhagen), J. Gorosabel (IAA-CSIC/STScI), J. Hjorth, B. L. Jensen (U. Copenhagen), J. P. U. Fynbo (U. Aarhus) report: "We observed the optical transient (Monard, GCN ##2324,2334) located inside the HETE-2 error box of GRB 030725 (Shirasaki et al., GCN #2322) with the Danish 1.5-m telescope on July 29.38 2003. The optical transient is detected at R = 21.2 +- 0.2 (preliminary calibration, partly based on zero points from previous nights, partly on USNO-B1.0 reference stars). The resulting decay rate is quite slow, with an average power-law decay index of ~ -0.9 since the detection 7 hours after the burst (Monard GCN #2324)."