GCN Circular 3201
Subject
GRB 050408: Emission and absorption redshift
Event
Date
2005-04-09T07:17:46Z (21 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
Edo Berger, Mike Gladders, and Gus Oemler (Carnegie Observatories) report:
"On 2005, April 9.22 UT we obtained a spectrum of the optical afterglow
(GCN 3193) of GRB 050408 (GCN 3189) with LDSS-3 on the Magellan/Clay
telescope. We find a broad emission line which we interpret as [OII]3727
at a redshift of z=1.236 and an absorption doublet which we interpret as
MgII 2796/2803 at the same redshift.
Given a fluence of about 3.3e-6 erg/cm^2 the isotropic-equivalent
gamma-ray energy is 1.3e52 erg."