  Primordial black holes are black holes that may have formed from density
fluctuations in the early universe. It has been theorized that black holes
slowly evaporate. If primordial black holes of initial mass of $10^{14}$g were
formed, their evaporation would end in this epoch, in a bright burst of
very-high-energy gamma rays. A Cherenkov telescope experiment like VERITAS can
look for these primordial black hole bursts in its archival data, constraining
the rate-density of their final evaporation. New analysis techniques and search
methodologies were used and will be presented here, leading to new constraints
on the rate-density evaporation of primordial black holes, using 750 hours of
archival VERITAS data.
