We have carried out a detailed study of the morphology of gamma-ray bursts
(GRBs) with time duration less than 100 ms that includes the following: (1)
a fast-Fourier spectrum analysis, (2) a comparison with the Stern analysis
of longer bursts, (3) an inner comparison of the properties of the short b
ursts, and (4) a comparison of the short burst properties with the bulk of
the GRBs from the Burst and Transient Source Experiment (BATSE) 4B catalog.
We have used the time tagged event (TTE) BATSE 3B data, which is available
to the public, for part of the analysis. We show that these bursts are ver
y different from the rest of the GRB events. The short bursts appear to be
nearly identical, suggesting a separate class of GRBs. We also show that th
e short bursts have a Euclidean spacetime distribution, in sharp contrast t
o the longer bursts with tau(duration) > 100 ms that implies that these sou
rces are likely local. Finally we compare the bursts with a model of primor
dial black hole (PBH) evaporation at the quark-gluon (Q-G) phase transition
temperature and other shock wave models.