TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3941 SUBJECT: Swift trigger 154073 is not a GRB DATE: 05/09/08 05:49:13 GMT FROM: Hans Krimm at NASA-GSFC H. Krimm (GSFC/USRA), S. Barthelmy (GSFC), N. Gehrels (GSFC), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC) on behalf of the Swift team: After analysis of the full data set from the recent Swift-BAT trigger (trigger=154073) at 01:20:29.72 UT on 8-Sep-2005 we have determined that this event is due to a cosmic ray hit on the detector array and not a GRB. The spacecraft did not slew to the burst because it was located 39 degrees from the sun, within the spacecraft sun constraint. Due to the sun constraint there were no observations with the XRT or UVOT and no observations are planned. NOTE: This trigger (154073) is not to be confused with trigger (154112) which we are currently analyzing.