TITLE: GCN CIRCULAR NUMBER: 17957 SUBJECT: Fermi Gamma-ray Burst Monitor triggers that are not GRBs DATE: 15/06/23 22:18:48 GMT FROM: Hoi-Fung Yu at MPE H.-F. Yu (MPE) and G. Younes (GWU) report on behalf of the Fermi GBM Team: "The following Fermi Gamma-ray Burst Monitor (GBM) trigger, on 23 June 2015, tentatively classified as GRB, is in fact not due to GRB. This trigger is due to particle activity: 150623.466 at UT 11:10:32.53. The following Fermi Gamma-ray Burst Monitor (GBM) trigger, on 22 June 2015, tentatively classified as GRB, is in fact not due to GRB. This trigger is due to solar activity: 150622.751 at UT 18:01:29.71."