[AAVSO-HEN] Swift-BAT trigger 180931 is not a GRB

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4721
SUBJECT: Swift-BAT trigger 180931 is not a GRB
DATE:    06/02/09 22:17:14 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott at lheamail.gsfc.nasa.gov>

S. Barthelmy (GSFC), L. Barbier (GSFC), J. Cummings (GSFC/ORAU),
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL),
A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (ISAS),
J. Tueller (GSFC)
on behalf of the Swift-BAT team:

The Swift-BAT trigger (trigger=180931) at 19:08:55 UT on 09 Feb 2006
is not due to a GRB or any other astrophysical source.  This trigger 
is due to a cosmic ray shower event in the instrument.