GCN Circular 2602
Subject
GRB 040511, very fast decay?
Date
2004-05-20T22:07:46Z (21 years ago)
Edited On
2024-11-18T10:05:19Z (5 months ago)
From
David Bersier at STScI <bersier@stsci.edu>
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>
D. Bersier, J. M. Castro Cerón, J. Rhoads, A. Fruchter (STScI), A. Levan
(U. of Leicester), J. Gorosabel (IAA-CSIC), C. Kouveliotou (NASA/MSFC,
NSSTC), S. Patel (USRA, NSSTC), M. Merrill (NOAO), J. Bally, J.
Walawender, (U. Colorado), and B. Reipurth (Hawaii) report on behalf of
a larger collaboration:
We have observed the field of GRB 040511 (GCN Dullighan et al. 2004, GCN
2588) with the CTIO 4m telescope on the nights of May 11 and May 12.
Our R-band photometry of the candidate afterglow (Fox et al. 2004, GCN
2597) shows that this source decayed by 2.5 mag between 0.79d and 1.60d
after the burst. Assuming that the decay follows a power law, we derive
an index of -3.2. If the variable source is indeed the afterglow of GRB
040511, this would be among the fastest decay indices ever observed.