Study of Very Short Gamma‐Ray Bursts

We have carried out a detailed study of the morphology of gamma-ray bursts(GRBs) with time duration less than 100 ms that includes: (1) a fast-Fourierspectrum analysis, (2) a comparison with the Stern analysis of longer bursts,(3) an inner comparison of the properties of the short bursts, and (4) acomparison of the short burst properties with the bulk of the GRBs from theBurst and Transient Source Experiment (BATSE) 4B catalogue. We have used thetime tagged event (TTE) BATSE 3B data, which is available to the public, forpart of the analysis. We show that these bursts are very different from therest of the GRB events. The short bursts appear to be nearly identical,suggesting a separate class of GRBs. We also show that the short bursts have aEuclidean space-time distribution, in sharp contrast to the longer bursts with$\tau_{duration} >$ 100 ms that implies that these sources are likely local.Finally we compare the bursts with a model of primordial black hole (PBH)evaporation at the quark-gluon (Q-G) phase transition temperature and othershock wave models.Comment: Text and 9 figure