GCN Circular 10272
Subject
GRB 091208B: Keck HIRES redshift confirmation
Date
2009-12-09T06:11:31Z (15 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
D. A. Perley (UC Berkeley), J. X. Prochaska (UCSC), P. Kalas, A. Howard,
M. Fitzgerald, G. Marcy, and J. Graham (UCB) report:
Starting at 10:58:17 UT on December 8 we initiated a single 1200 second
exposure of the afterglow of GRB 091208B (GCN 12055, de Ugarte Postigo
et al.; GCN 10256, Pagani et al.) with HIRES-r on the 10m Keck I
telescope. Consistent with the result of Wiersema et al. (GCN 10263),
we detect absorption lines from MgII and MnII at a redshift of
z=1.0633+/-0.0003. Additionally, we detect fine-structure transitions
of FeII confirming that this is the redshift of the GRB.