[vsnet-grb-info 2253] Swift trigger 159578 is not a burst

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4092
SUBJECT: Swift trigger 159578 is not a burst
DATE:    05/10/13 21:25:11 GMT
FROM:    Hans Krimm at NASA-GSFC  <krimm at milkyway.gsfc.nasa.gov>

J. Cummings (GSFC-NRC), A. Beardmore (U. Leicester), D. Burrows (PSU),
N. Gehrels (GSFC), O. Godet (U. Leicester), C. Gronwall (PSU),
J. Kennea (PSU), H. Krimm (GSFC-USRA), F. Marshall (GSFC),
K. Page  (U. Leicester), D. Palmer (LANL), on behalf of the Swift team:

Analysis of the Swift-BAT event data, the Swift-XRT Image Mode frame and
the first two orbits of XRT PC mode data (1.2 ksec) for trigger 159578
(Cummings et al., GCN 4091) reveals no point source.  Therefore we
conclude that it is not due to a GRB or other astrophysical source.
This trigger was likely due to the chance coincidence of a rate increase
as the satellite was entering the SAA and a positive fluctuation in the
image domain.