GCN Circular 6322
Subject
GRB 070419: Keck/LRIS Absorption Redshift
Date
2007-04-19T21:54:28Z (17 years ago)
From
S. Bradley Cenko at Caltech <cenko@srl.caltech.edu>
S. B. Cenko, S. Gezari, T. Small (Caltech), D. B. Fox (Penn State), and E.
Berger (Carnegie) report on behalf of a larger collaboration:
We have obtained a spectrum of the optical afterglow of GRB070419A
(Chornock et al., GCN 6304) with the Low-Resolution Imaging Spectrometer
mounted on the 10-m Keck I telescope. Observations consisted of 2 x 900 s
spectra taken at a mean epoch of approximately 11:36 19 April UT (~ 1.62
hr after the burst).
We identify a single strong absorption system, including Mg II, Fe II, Mn
II, and Fe I features, at a preliminary redshift of z = 0.97. Coupled
with the lack of Lyman-alpha absorption down to ~ 3500 A, we consider
this system is likely from the host galaxy of GRB070419A.