GCN Circular 8718
Subject
GRB 081222: Gemini-N confirmation of redshift z=2.77
Date
2008-12-23T20:14:39Z (15 years ago)
From
John Graham at STScI <graham@stsci.edu>
J. F. Graham (STScI/JHU), N. R. Tanvir (U. Leicester), A. S. Fruchter
(STScI), K. Wiersema (U. Leicester), A. J. Levan (U. Warwick) report on
behalf of a larger collaboration:
We observed the afterglow of GRB 081222 with Gemini-North/GMOS Nod &
Shuffle spectroscopy beginning 22 Dec 2008 06:38 UT, approximately 105
minutes post-burst. From absorption lines of SiII, CIV, and FeII, we
confirm the redshift reported in GCN 8713 (Cucchiara et al.) of z=2.77.
We also find tentative evidence for a lower redshift system at z=2.74.
We thank the Gemini staff, in particular Ricardo Schiavon, for
conducting these observations.