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 8065

GRB080804: Gemini South redshift confirmation
2008-08-05T15:34:42Z (16 years ago)
Antonino Cucchiara at PSU <>
A. Cucchiara, D. B. Fox (Penn State), S. B. Cenko (Caltech) and E. Berger
(Harvard U.) report on behalf of a larger collaboration:

Starting at 01:27 UT on 2008 August 5 we observed  the optical counterpart
of GRB 080804 (Rujopakarn et al., GCN 8056, Racusin et al., GCN 8057) using
Gemini-South with GMOS spectrograph (R~1200).
We acquired 2x900s spectra which covered the wavelength range 4000A-8000A
and 2x900s spectra covering the range 6000A-10000A.

We detect some of the metal absorption features identified by Thoene et al.
(GCN 8058), like FeII (1608, 2260), NiII (1741 and 1751) and we also detect
MgII doublet (2796,2803). We also detect part of the red wing of the Lyman
break indicating a possible DLA associated with the grb host galaxy.

All these features confirm that the grb redshift is z = 2.20.

We thank the Gemini staff for conducting these observations.
Looking for U.S. government information and services? Visit