GCN Circular 3101
Subject
GRB 050315: Absorption redshift
Event
Date
2005-03-16T09:57:54Z (21 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
Dan Kelson and Edo Berger (Carnegie Observatories) report:
"Using LDSS3 on Magellan we also obtained a 20-minute spectrum of the
afterglow candidate (GCN 3100). We find several absorption features which
we identify as AlIII (1854.7 and 1862.8) and SiII (1808.0) at a redshift
of z=1.949. We conclude that this is the redshift of GRB 050315.
Given a fluence of >2.8e-6 erg/cm^2 (GCN 3099), the isotropic-equivalent
gamma-ray energy is > 2.6e52 erg."