GCN Circular 1467
Subject
GRB 020715, optical observations
Date
2002-08-12T12:02:08Z (22 years ago)
Edited On
2024-11-18T10:04:15Z (2 months ago)
From
Javier Gorosabel at LAEFF-INTA, Madrid <jgu@laeff.esa.es>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
J. Gorosabel (IAA-CSIC), J.M. Castro Cerón (ROA),
A.J. Castro Tirado (IAA-CSIC), A. Guijarro (CAHA),
F. Hoyo (CAHA), S. Pedraz (CAHA) and C. Wolf (Oxford Univ.),
report:
We have performed Ic-band observations of the central part
(coverage 40%) of the GRB 020715 (GCN 1456) error box with
the 2.2m Telescope of Calar Alto (+BUSCA) as follows:
========================================================
Date Seeing Exp.Time Lim.Mag. Time Since
(2002 UT) (") (s) (3 sigma) GRB (days)
--------------------------------------------------------
17.945-18.007/07 1.2 5x900 24.4 2.2
18.872-18.947/07 1.0 6x900 24.7 3.1
05.864-05.931/08 1.5 6x900 24.3 21.1
--------------------------------------------------------
Marginal variability (< 0.2 mag) is detected for 3 sources.
None of these objects shows flux variability consistent with
a monotonic decay, as expected for an optical afterglow
2.2-21.1 days after the gamma ray event.