[vsnet-grb-info 2418] GRB 051111: Keck HIRES redshift

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4255
SUBJECT: GRB 051111: Keck HIRES redshift
DATE:    05/11/11 08:13:00 GMT
FROM:    Jason Prochaska at UCO/Lick Obs  <xavier at ucolick.org>

G. Hill (Keck),  J.X. Prochaska (UCO/Lick),  D. Fox (Penn State),
B. Schaefer (Keck), M. Reed (Keck):

"We have observed GRB 051111 with HIRESr on the Keck telescope
for 1800s starting UT 07:03.  We detect a series of strong MgII,
FeII and SiII absorption features at a redshift z=1.55.  Because we
detect no additional features redward of the MgII doublet, we
adopt this as the redshift of GRB 051111."

A full analysis is underway.