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

GCN Circular 6262

Subject
GRB 070406: Bright galaxy in XRT error circle is a quasar
Date
2007-04-09T14:55:06Z (17 years ago)
From
Edo Berger at Carnegie Obs <eberger@ociw.edu>
E. Berger (Carnegie), D.B. Fox (Penn State), and E. Ofek (Caltech) report 
on behalf of a larger collaboration:

"Starting on 2007 April 8.31 UT we used the Gemini Multi-Object 
Spectrograph (GMOS) on Gemini-North to obtain a spectrum of the bright 
galaxy located in the XRT error circle of the possible afterglow of GRB 
070406 (GCNs 6255,6256,6259).  We detect a narrow [OII] emission line and 
broad H-gamma and H-delta emission features at z=0.703.  The broad H-gamma 
and H-delta lines are indicative of a quasar spectrum, and it is therefore 
likely that the X-ray emission detected with XRT is due to AGN activity 
and not the afterglow of GRB 070406.  Further XRT observations are 
essential to confirm fading versus long-term variability."
Looking for U.S. government information and services? Visit USA.gov