GCN Circular 4592
Subject
GRB 060124: Keck Absorption Redshift
Event
Date
2006-01-25T09:40:11Z (20 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. B. Cenko (Caltech), E. Berger (Carnegie Observatories) and J. Cohen
(Caltech) report on behalf of a larger collaboration:
"We obtained two 1800 sec spectra of GRB 060124 (Holland et al., GCN 4570)
with the Echellette Spectrograph and Imager (ESI) on the Keck 10-m
telescope starting on 2006 Jan. 25.23 UT. We detect the broad absorption
feature detected by Mirabal and Halpern (GCN 4591), which is clearly a
doublet, and identify it as CIV 1548,1550 at z=2.297. We also detect the
MgII 2796,2803 at the same redshift. At this redshift and given a
fluence of about 7e-6 erg/cm^2 (Fenimore et al., GCN 4586) we find an
isotropic-equivalent gamma-ray energy of 8.9e52 erg."