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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.
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