[vsnet-grb-info 7137] GRB 081222: Gemini-N confirmation of redshift z=2.77
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Dec 24 05:14:53 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8718
SUBJECT: GRB 081222: Gemini-N confirmation of redshift z=2.77
DATE: 08/12/23 20:14:39 GMT
FROM: John Graham at STScI <graham at 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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