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More than a decade ago we identified a class of VSGRB (T90 < 100 ms) ashaving unusual properties: (1) galactic position asymmetry, (2) very hard gammaspectrum, (3) possible evidence for galactic origin of these events. We nowstudy the recent Swift data and show that a VSGRB enhancement consistent BATSEand KONUS exists. We estimate that this is now a total 4.5sigma observation. Wethen study the VSB for evidence of the time structure expected for PBHevaporation. Several of the events show the general time structure expected forPBH evaporation. If correct, then PBH must exist in this galaxy. Since evenlarge detectors like BATSE record only a few VSB per year the density of PBHcan still be very small and it is hard to predict a rate for the Fermispacecraft LAT.

Evidence for Primordial Black Hole Final Evaporation: Swift, BATSE and  KONUS and Comparisons of VSGRBs and Observations of VSB That Have PBH Time  Signatures