[vsnet-grb-info 2572] GRB 051227: Keck Spectroscopy

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4409
SUBJECT: GRB 051227: Keck Spectroscopy
DATE:    05/12/28 14:04:14 GMT
FROM:    Ryan Foley at UC Berkeley  <rfoley at astro.berkeley.edu>

R. J. Foley, J. S. Bloom (UC Berkeley), J. X. Prochaska, G. D.
Illingworth, B. P. Holden, D. Magee (UCO/Lick), P. Challis, and A. Garg
(CfA) report:

"We obtained 2x1500 sec spectra of the object found inside, S1 (GCN 4404,
4407, 4408), and the galaxy north-east, G1 (GCN 4408), of the XRT error
box of GRB 051227 (GCN 4402) with Keck II (+ DEIMOS).  We detect
absorption lines at the position of the galaxy which we identify as Ca II
H&K at z = 0.714.  We also detect emission lines which we identify as
[O II] 3727 and H beta.

If the GRB afterglow is S1 and at this redshift, then the offset from G1
to S1 would amount to 33.7 kpc in projection."