[AAVSO-HEN] Retraction of Swift Trigger 317393

[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:  7987
SUBJECT: Retraction of Swift Trigger 317393 
DATE:    08/07/20 13:47:47 GMT
FROM:    Craig Markwardt at NASA/GSFC/UMD  <craigm at milkyway.gsfc.nasa.gov>

C. B. Markwardt (CRESST/UMD/GSFC),  J. K. Cannizzo (NASA/UMBC), J. R. 
Cummings (NASA/UMBC), C. Gronwall (PSU), C. Guidorzi (INAF-OAB)
report on behalf of the Swift team:


On 2008-07-20 at 00:23:41 UT, Swift BAT detected an excess, and reported 
as a possible GRB (Trigger #317393; Cannizzo et al., GCN Circ. #7986). 
After refined BAT ground analysis, the excess is no longer significant. 
Furthermore, no uncatalogged sources were detected by Swift XRT or UVOT.
Therefore, we conclude that this trigger is not a GRB.