[vsnet-grb-info 11811] BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Apr 4 05:37:40 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 13202
SUBJECT: BAT trigger 519207 was a burst from Cyg X-1, was not GRB 120402A
DATE: 12/04/03 20:32:51 GMT
FROM: Jay R. Cummings at NASA/GSFC/Swift <james.r.cummings at nasa.gov>
J. R. Cummings (GSFC/UMBC), C. B. Markwardt (GSFC), and
T. Sakamoto (NASA/UMBC) on behalf of the Swift-BAT team
The BAT trigger# 519207 (Barthelmy et al, GCN Circ# 13190) has been
identified as due to a flare from Cyg X-1, not a GRB. The maskweighted
BAT lightcurve for Cyg X-1 shows a single symmetric pulse in the
15-50 keV band, about 4 seconds long at the same time as the BAT
trigger. The BAT triggered on the Cyg X-1 flare. While the on-board
processing ignores known bright sources, a portion of the Cyg X-1 flare
appeared in a spatially separate side-lobe, which the BAT did
trigger on.
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