TITLE: GCN CIRCULAR NUMBER: 5923 SUBJECT: Swift-BAT Trigger 250908 is a Cosmic Ray Shower event DATE: 06/12/14 19:58:34 GMT FROM: Ann M. Parsons at NASA/GSFC/Swift J. Cummings (GSFC/UMBC), A. Parsons (GSFC) for BAT, S. Oates (UCL-MSSL), S. B. Pandey (UCL-MSSL), P. Schady (UCL-MSSL) for UVOT, P. A. Evans (U Leicester), K. L. Page (U Leicester) for XRT on behalf of the Swift team: The Swift-BAT trigger 250908 (S. B. Pandey, et al. GCN Circ. 5918) at 12:16:53 UT, on 14 DEC 2006 is not a GRB. It is due to a cosmic ray shower in the spacecraft. All 29 events recorded in the BAT detector array occurred within a single 100 microsecond timestamp interval.