[vsnet-grb-info 1933] Retraction of Swift Trigger 149131 (GRB 050805B)

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3772
SUBJECT: Retraction of Swift Trigger 149131 (GRB 050805B)
DATE:    05/08/06 01:08:12 GMT
FROM:    Craig Markwardt at NASA/GSFC/UMD  <craigm at milkyway.gsfc.nasa.gov>

C. Markwardt (GSFC/UMD), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC)
J. Kennea (PSU), C. Pagani (PSU)
on behalf Swift team:

We report that trigger number 149131, previously designated GRB
050805B, is retracted.  This trigger is consistent with a cosmic ray
shower event in the detector, and a simultaneous random image
fluctuation.

Ground analysis of the XRT data does not show any X-ray source in the 
field. We therefore conclude from the XRT data that Trigger 149131 is not 
a GRB.

As a separate note, the BAT position notice was delayed by ~42 seconds
on board the spacecraft, due to a backlog of TDRSS telemetry caused by
a commanded procedure.