GCN Circular 12429
Subject
GRB 111008A: Gemini spectroscopic redshift
Event
Date
2011-10-09T06:31:58Z (14 years ago)
From
Andrew Levan at U.of Leicester <A.J.Levan@warwick.ac.uk>
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."