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This class includes transient events that are suspected to be
GRBs, but with a lower confidence level than the Likely GRBs.
The majority of these events
have durations 1 s, and did not trigger the on-board
logic (thus, no High Time Resolution -hereafter HTR-
count rates are available for them);
in other words, these events may be considered as mild
short burst candidates, for which no decisive inspection of
any HTR profile is feasible, unless the same short GRB
has triggered other experiments simultaneously, like BATSE;
only in this case, the non-triggered short burst candidate
is raised to the rank of GRB (1st class).
A strong contamination of spikes, owing
to high-energy particles, is possible; however, since this
class has not been taken into account any further, this kind of
non-GRB contamination will be ignored in the following.