TITLE: GCN CIRCULAR NUMBER: 5781 SUBJECT: Swift-BAT Trigger 236481 is a Cosmic Ray Shower event DATE: 06/11/02 09:51:01 GMT FROM: Scott Barthelmy at NASA/GSFC L. Barbier (GSFC), S.D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), S.T Holland (GSFC/USRA), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team: The BAT trigger 236481 (Holland et al, GCN Circ 5778) is not a GRB. It is due to a cosmic ray shower in the spacecraft. All 60 events recorded in the BAT detector array occurred within a single 100 microsecond timestamp interval.