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These transient events are very likely to be cosmic GRBs, but
they show some strange
features, either in the light curves, resembling
background variations, or in the arrival directions,
very close to the Sun, or to the Earth direction.
Other cases that have been classified as likely GRBs,
include those off-line triggers showing typical light curves,
but with unusually softer HRs than normal GRBs.
On principle, one cannot exclude the possibility
that an intermediate HR class of GRBs might indeed exist;
on the other hand, since the GRB selection is aimed to extract
a conservative catalog of GRBM bursts, these potential GRBs
have not been accepted.