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GCN Circular 21028

Fermi GBM trigger 514436208/170421123 is not a GRB
2017-04-21T08:49:42Z (7 years ago)
Andreas von Kienlin at MPE <>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: 

 "The Fermi Gamma-ray Burst Monitor (GBM) trigger 514436208/170421123 
at 02:56:43.38 UT on 21 April 2017, tentatively classified as a GRB, 
is in fact not due to a GRB. This trigger is due to local particles."
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