GCN Circular 29880
Subject
Fermi Gamma-ray Burst Monitor trigger 210421C is not a GRB
Date
2021-04-22T02:18:40Z (4 years ago)
From
Oliver J Roberts at USRA/NASA <oliver.roberts@nasa.gov>
O.J. Roberts (USRA/MSFC) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:
���The Fermi Gamma-ray Burst Monitor (GBM) trigger 640728778/210421842 (210421C)
at 20:12:53.03 UT on 21 April 2021 (Fermi-GBM Team 2021, GCN 29871), tentatively classified
as a GRB, is in fact not due to a GRB. This trigger is likely due to a Terrestrial Electron Beam."