GCN Circular 6928
Subject
GRB 071010B: Keck/DEIMOS emission-line redshift
Event
Date
2007-10-17T04:47:44Z (18 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
D. Stern (JPL), D. A. Perley (UC Berkeley), N. Reddy (NOAO), J. X.
Prochaska (UCSC), H. Spinrad (UCB) and M. Dickinson (NOAO) report:
On the night of 2007 Oct. 11 we observed the afterglow of GRB 071010B
(GCN 6871, Markwardt et al.; GCN 6873, Okansen et al.) with the Keck II
10m telescope + DEIMOS, for a total integration time of 1260 seconds,
starting at 14:41 UT. The wavelength coverage was between 5230 and
10480 Angstroms.
The detection of MgII previously reported by Cenko et al. (GCN 6888) and
Prochaska et al. (GCN 6890) at a redshift of 0.947 is further confirmed,
as is a weak detection of MgI 2852.
In addition, the [OII] 3727 doublet emission feature is well-detected at
the same redshift, superimposed on the continuum. [OIII] 5008 is also
detected, as is (marginally) [OIII] 4960.
These results strongly suggest that the redshift of GRB 071010B and its
host galaxy is most likely 0.947.