[AAVSO-HEN] Swift-BAT trigger 278809 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 CIRCULAR
NUMBER:  6381
SUBJECT: Swift-BAT trigger 278809 is not a GRB
DATE:    07/05/07 15:45:36 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott at lheamail.gsfc.nasa.gov>

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

The Swift-BAT trigger (trigger=278809) at 13:24:51 UT on 07 May 2007,
tentatively labelled GRB 070507 (GCN 6380, Vetere et al.),
is not due to a GRB or any other astrophysical source.  This trigger 
is due to a cosmic ray shower event in the instrument.  All 128 events
occurred in the same 100 microsec window.