TITLE: GCN CIRCULAR NUMBER: 20930 SUBJECT: Fermi GBM trigger 511851891/170322212 is not a GRB DATE: 17/03/22 10:49:11 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 511851891/170322212 at 05:04:46.49 UT on 22 Mar 2017, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to local particles."