TITLE: GCN CIRCULAR NUMBER: 18719 SUBJECT: Fermi GBM trigger 151221730 is not a GRB DATE: 15/12/23 18:41:32 GMT FROM: Peter Jenke at MSFC P. Jenke (UAH) reports on behalf of the Fermi GBM team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 151221730/472411854 at 17:30:50.36 UT on the 21 of December 2015, tentatively classified as GRB, is in fact not due to GRB. This trigger is due to V404 Cyg.”