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 4221

GRB 051109: HET Optical Spectrum and Absorption Redshift
2005-11-09T08:06:51Z (19 years ago)
Robert Quimby at U of Texas/ROTSE <>
R. Quimby (U. Texas), D. Fox (PSU), P. Hoeflich (U. Texas), B. Roman,
and J. C. Wheeler (U. Texas) report:

We observed the optical afterglow (Rykoff et al. GCN 4211) of GRB
051109 (Tagliaferri et al. GCN 4213) with the 9.2m Hobby-Eberly
Telescope (+ Marcario Low-Resolution Spectrograph) beginning November
9, 03:55:40 UT (~2.5 hrs after the burst trigger). Several absorption
lines are present in the spectrum corresponding to Si II (1526.7), C
IV, Cr II (2056.3, 2066.2), and Fe II (2344.2, 2382.8) among others
at a redshift of z=2.346.
Looking for U.S. government information and services? Visit