TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4592 SUBJECT: GRB 060124: Keck Absorption Redshift DATE: 06/01/25 09:40:11 GMT FROM: S. Bradley Cenko at Caltech 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."