TITLE:   GCN CIRCULAR
NUMBER:  30873
SUBJECT: Retraction of Fermi GBM GRB 210923A: the trigger is not a GRB
DATE:    21/09/23 22:03:59 GMT
FROM:    Joe Mangan at UCD  <joseph.mangan@ucdconnect.ie>

J.Mangan (UCD), S.Lesage (UAH) report on behalf of the Fermi Gamma-ray
Burst Monitor Team:

The Fermi Gamma-ray Burst Monitor (GBM) trigger 654090581/210923493 at
11:49:36.820 UT
on 23 September 2021, tentatively classified as a GRB (GCN 30865), is in
fact not due
to a GRB. This trigger is likely due to a terrestrial electron beam (TEB).