[vsnet-grb-info 10974] Swift-BAT trigger 503926 is noise

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12392
SUBJECT: Swift-BAT trigger 503926 is noise
DATE:    11/09/24 16:05:45 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

S. D. Barthelmy (GSFC), D. Burrows (PSU), J. R. Cummings (GSFC/UMBC),
E. A. Hoversten (PSU), H. A. Krimm (GSFC/USRA), S. Oates (UCL-MSSL),
C Pagani (UL)
(for the Swift team):
 
Using the BAT data set from T-239 to T+963 sec from recent telemetry downlinks,
we report further analysis of Swift-BAT trigger #503926 (Hoversten, et al.,
GCN Circ. 12391).  This trigger is due to chance coincidence
of noise fluctuations in the rate and image domains.

XRT observations in Photon Counting mode data started 126 s after the 
BAT trigger. In 2ks of PC data no source is detected inside the BAT
error circle.  The three sigma upper limit is 4e-3 counts/second.

This trigger is a noise event, and is not anything astrophysical.