{
  "bibcode": "2006GCN..4815....1B",
  "body": "E. Berger (Carnegie), S. R. Kulkarni, A. Rau (Caltech), and D. B. Fox\n(Penn State) report on behalf of a large collaboration:\n\n\"Starting on 2006, Feb 23.2875 UT (39 min after the burst) we obtained\nspectroscopic observations of the optical afterglow of GRB 060223 (GCNs\n4813,4814) using LRIS on the Keck-I 10-m telescope.  In a single 720 sec\nexposure we detect a broad absorption profile which we identify as\nLyman-alpha at a redshift z=4.41, as well as metal absorption features\nfrom OI, SiII, SiII*, etc at the same redshift.\"",
  "circularId": 4815,
  "createdOn": 1140682789000,
  "email": "eberger@ociw.edu",
  "subject": "GRB 060223: Keck redshift",
  "submitter": "Edo Berger at Carnegie Obs  <eberger@ociw.edu>",
  "eventId": "GRB 060223"
}