TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3599 SUBJECT: Swift-BAT Trigger 145729 is not a GRB DATE: 05/07/13 20:37:12 GMT FROM: Scott Barthelmy at NASA/GSFC S. Barthelmy (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC), on behalf of the Swift-BAT team: At 08:50:21.82 UT, the Swift-BAT instrument triggered (trigger=145729). After careful analysis of the full Malindi data set, this trigger has been determined to not be due to a real GRB. It is most likely due to a particle shower event. And to review the recent activity of BAT triggers and bursts: TrigNum Date Time Comment 145563 050712 12:05:37.98 Non-burst, retraction Notice issued 145581 050712 14:00:27.51 Burst, GCN 3573 145675 050713 04:29:02.39 Bright burst, GCN 3581 145729 050713 08:50:21.82 Non-burst, this Circular 145754 050713 12:07:17.62 Burst, GCN 3590 145767 050713 14:17:24.34 Non-burst, retraction Notice issued