GCN Circular 4815
Subject
GRB 060223: Keck redshift
Date
2006-02-23T08:19:49Z (18 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
E. Berger (Carnegie), S. R. Kulkarni, A. Rau (Caltech), and D. B. Fox
(Penn State) report on behalf of a large collaboration:
"Starting on 2006, Feb 23.2875 UT (39 min after the burst) we obtained
spectroscopic observations of the optical afterglow of GRB 060223 (GCNs
4813,4814) using LRIS on the Keck-I 10-m telescope. In a single 720 sec
exposure we detect a broad absorption profile which we identify as
Lyman-alpha at a redshift z=4.41, as well as metal absorption features
from OI, SiII, SiII*, etc at the same redshift."