Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 12429

GRB 111008A: Gemini spectroscopic redshift
2011-10-09T06:31:58Z (13 years ago)
Andrew Levan at U.of Leicester <>
A.J. Levan (Warwick), K. Wiersema, N.R. Tanvir (Leicester) report
for a larger collaboration:

"We obtained optical spectroscopy of the candidate counterpart of
GRB 111008A (Saxton et al. GCN 12423, Levan et al. GCN 12426),
with GMOS on Gemini-South. Observations were centred at 6000A, 
and cover the region from 3900-8100A. We see flux from the 
candidate afterglow down to ~5500A, and a broad absorption feature 
centred at ~7300A, with a brighter continuum red-ward of this.  If 
interpreted as a DLA then this suggests that the redshift of 
GRB 111008A is z~5. We also find weak absorption lines of 
Ly-beta, OI(1302), CII(1334) and SiII (1260.5), consistent with a 
common redshift of z=5.0.

We note that there was a typographical error in the co-ordinates
of GCN 12426, which should have read

RA(J2000) 04:01:48.24 
DEC(J2000) -32:42:33.4

We thank Javier Gorosabel for pointing this error out, and apologise
for any confusion."
Looking for U.S. government information and services? Visit