[vsnet-grb-info 5040] Swift Trigger 28742: False trigger due to star tracker loss

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6749
SUBJECT: Swift Trigger 28742: False trigger due to star tracker loss
DATE:    07/08/10 20:29:15 GMT
FROM:    David Palmer at LANL  <palmer at lanl.gov>

P. J. Brown (PSU), J. R. Cummings (NASA/UMBC),
P. A. Evans (U Leicester), C. Guidorzi (Univ Bicocca&INAF-OAB),
J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC),
J. P. Osborne (U Leicester), K. L. Page (U Leicester),
D. M. Palmer (LANL), P. Romano (Univ. Bicocca & INAF-OAB),
T. Sakamoto (NASA/ORAU), G. Sato (GSFC/ISAS) and
M. Stamatikos (NASA/ORAU) report on behalf of the Swift Team:

At 19:54 UT, Swift suffered a loss of star tracker lock, and
the Burst Alert Telescope (BAT) then interpreted Sco X-1 as a GRB
(trigger=287421).

The BAT position notice correctly contained the comment line:
COMMENTS:        This trigger occured while the StarTracker had lost 
lock, so it is possibly bogus.

Star tracker recovery is currently underway.
--