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The Terrestrial Gamma-ray Flashes (hereafter TGFs) are
charachterized by very short duration (1-4 ms) pulses
and they have been discovered with BATSE ([Fishman et al., 1994b]).
They seem to be connected with powerful thunderstorm activity.
All the GRBM events lasting within single 1 s bins and that
seem likely to come from the Earth atmosphere, are classified
as Suspected TGFs.