[vsnet-grb-info 15288] Swift Trigger 604111 is not a GRB

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16580
SUBJECT: Swift Trigger 604111 is not a GRB
DATE:    14/07/12 03:18:33 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at milkyway.gsfc.nasa.gov>

S. D. Barthelmy (GSFC), M. M. Chester (PSU),
J. R. Cummings (NASA/UMBC), J. A. Kennea (PSU), V. Mangano (PSU) and
D. M. Palmer (LANL) report on behalf of the Swift Team:

At 02:58:30 UT, the Swift Burst Alert Telescope (BAT) triggered on a noise
fluctuation on the rising background while entering the SAA. 

The XRT began observing the field at 03:00:00.6 UT, 89.9 seconds after
the BAT trigger and centroided on a cosmic ray hit. 

Because this is a marginal significance BAT image peak, as Swift was 
entering the SAA, and there is no corresponding source at the correct 
location in XRT, we believe that this is not an astrophysical source.