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

GCN Circular 8393

Swift trigger 332287 is not a GRB
2008-10-21T14:47:15Z (16 years ago)
Jay R. Cummings at NASA/GSFC/Swift <>
J. R. Cummings (NASA/UMBC/CRESST) on behalf of the Swift team:

We have analyzed BAT event data from trigger 332287 (Lyons et al.
GCN# 8392).  We cannot improve the weak peak in the image domain
at the position of the source that was reported onboard. We see a
weak peak from Cyg X1 in an image at the trigger time, and a weak
peak in the maskweighted lightcurve at the position of Cyg X1. We
conclude that the trigger was due to a weak burst from Cyg X1 and
a chance peak in the image domain, and not from a GRB.
Looking for U.S. government information and services? Visit