TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3321 SUBJECT: Swift-BAT Trigger 115881 is not a real GRB DATE: 05/04/30 17:58:00 GMT FROM: Scott Barthelmy at NASA/GSFC S. Barthelmy (GSFC), C. Markwardt (GSFC/UMD), D. Palmer (LANL), B. Zhang (UNLV) on behalf of the Swift-BAT team: The Swift-BAT triggered (trigger=115881, GCN Circ 3320) at 13:29:35 UT is not due to a GRB. The trigger occured on the rising edge of the SAA. Ground analysis has confirmed the very low image-domain detection significance. A visual inspection of the mask-tagged light curve also shows no significant emission.