TITLE:   GCN CIRCULAR
NUMBER:  33025
SUBJECT: Swift/BAT trigger #1143281 is not a GRB
DATE:    22/12/06 17:42:49 GMT
FROM:    David Palmer at LANL  <palmer@lanl.gov>

David Palmer, on behalf of the Swift Team, reports:

Swift/BAT trigger #1143281, at 2022-12-04 20:45:05 UT, was due
to the misidentification of Cyg X-1 during a star tracker Loss of Lock.

Therefore, the optical limits reported in GCN #33018 (Lipunov et al.)
and GCN #33020 (Odeh) are not relevant to an astrophysical event.