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 8987

GRB 090306B: Confirmation of the X-ray afterglow
2009-03-13T13:51:35Z (15 years ago)
Phil Evans at U of Leicester <>
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:

Swift has performed follow-up observations of the BAT Slew Survey GRB
090306B (Copete et al, GCN Circ. 8944), gathering 4 ks of data in the
interval T0+484 ks to T0+555 ks. The X-ray source reported by Evans et
al. (GCN Circ 8947) is no longer detected, with a 3-sigma upper limit of
1.9e-3  counts/sec. We thus confirm that it was the afterglow of GRB

This circular is an official product of the Swift-XRT team.
Looking for U.S. government information and services? Visit