GCN Circular 18487
Subject
GRB 151027A: Keck/HIRES redshift
Date
2015-10-27T13:57:31Z (9 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley (DARK/NBI), L. Hillenbrand (Caltech), and J. X. Prochaska
(UCO/Lick) report:
We obtained a 900s spectrum of the optical afterglow of GRB 151027A
(Maselli et al., GCN 18478) with Keck/HIRES starting at UT 06:54 on
2015-10-27. In the preliminary reduction, we identify a series of
strong absorption lines including the MgII doublet at z=0.81. Associated
MgI, FeII, and (likely) FeII* are also present, indicating that this is
the redshift of the GRB. Analysis is ongoing.