TITLE: GCN CIRCULAR NUMBER: 18651 SUBJECT: Fermi GBM trigger 470375959/151128166 is not a GRB DATE: 15/11/28 06:34:49 GMT FROM: Elisabetta Bissaldi at U.Innsbruk/IAPP E. Bissaldi (INFN Bari) reports on behalf of the Fermi GBM Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 470375959/151128166 at 03:59:15.95 UT on 28 November 2015, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is due to particle activity."