TITLE: GCN CIRCULAR NUMBER: 20868 SUBJECT: Fermi GBM trigger 510642159/170308210 is not a GRB DATE: 17/03/14 16:28:46 GMT FROM: C. Michelle Hui at MSFC/Fermi-GBM C.M.Hui (NASA/MSFC) reports on behalf of the Fermi GBM team: The Fermi Gamma-ray Burst Monitor (GBM) trigger 510642159/170308210 at 05:02:34.18 UT on 8 Mar 2017, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to local particles.