Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 3388

GRB 050509b: Optical Counterpart Candidate
2005-05-09T08:44:13Z (19 years ago)
Josh Bloom at Harvard/CFA <>
J. Bloom (UCB), C. Blake (Harvard), J. X. Prochaska (UCSC), J. Hennawi
(UCB), M. Gladders (Carnegie), B. Koester (U Michigan) and H. W. Chen
(MIT) report:

We have continued to observe GRB 050509b (GCN #3383) with the imager
on the 3.5m WIYN telescope. Under improving conditions, a 600s observation
in the sloan r band beggining at 06:05 UT revealed a apparent point source
within the XRT error circle (GCN #3383) and within the detectable light of
the nearby galaxy (GCN #3386).

A finding chart may be found at:

This message may be cited.
Looking for U.S. government information and services? Visit