[vsnet-grb-info 4020] Swift-BAT trigger 239987 is not a GRB

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5835
SUBJECT: Swift-BAT trigger 239987 is not a GRB
DATE:    06/11/22 09:23:47 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

S. McBreen (MPE), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), D. N. Burrows (PSU),
P. A. Evans (U Leicester), J. A. Kennea (PSU),
W. B. Landsman (NASA/GSFC), V. Mangano (INAF-IASFPA),
C. B. Markwardt (GSFC/UMD), K. L. Page (U Leicester),
D. M. Palmer (LANL), S. B. Pandey (UCL-MSSL),
P. Romano (Univ. Bicocca & INAF-OAB), T. Sakamoto (NASA/ORAU),
M. Stamatikos (NASA/ORAU) and H. Ziaeepour (UCL-MSSL) report on
behalf of the Swift Team:

At 08:58:16 UT, the Swift Burst Alert Telescope (BAT) triggered on
the count rate increase during entry into the SAA, and
located a marginal-significance peak in the resulting image 
(trigger=239987).  Swift slewed immediately to the derived location. 
The BAT light curve shows no significant burst activity overlying 
the particle background increase. 

The XRT began observing the field at 08:59:31 UT, 74 seconds after the
BAT trigger. The XRT centroided on a cosmic ray in the image. The quicklook
downlinked image shows no evidence for a source in 3s of data.