GCN Circular 2335
Subject
GRB 030725: optical observations.
Date
2003-07-29T18:40:59Z (21 years ago)
From
Javier Gorosabel at LAEFF-INTA, Madrid <jgu@laeff.esa.es>
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)."