TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3881 SUBJECT: Swift-BAT trigger 152038 is definitely not a GRB DATE: 05/08/25 19:15:22 GMT FROM: Scott Barthelmy at NASA/GSFC S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), C. Markwardt (GSFC/UMD) on behalf of the Swift-BAT team: Using the full BAT data from the recent telemetry downlink, the Swift-BAT trigger 152038 (at 17:43:37 UT on 25 August 2005) is not due to a GRB. This was a cascade shower event from a high energy cosmic ray in the spacecraft.