TITLE: GCN CIRCULAR NUMBER: 21092 SUBJECT: Fermi GBM trigger 516459580/170514541 is not a GRB DATE: 17/05/14 16:20:21 GMT FROM: Elisabetta Bissaldi at U.Innsbruk/IAPP E. Bissaldi (Politecnico & INFN Bari) reports on behalf of the Fermi GBM Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 516459580/170514541 at 12:59:35.75 UT on 14 May 2017, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to local particles."