TITLE: GCN CIRCULAR NUMBER: 19455 SUBJECT: The nature of the Fermi/GBM trigger 160523919 is unknown. DATE: 16/05/24 18:55:25 GMT FROM: Peter Jenke at MSFC P. Jenke (UAH) reports on behalf of the Fermi GBM Team: The nature of the Fermi Gamma-ray Burst Monitor (GBM) trigger 485733821/160523919 at 22:03:37.13 UT on 23 May 2016, tentatively classified as a GRB, can not be verified.