  Using three parametrizations of the gamma ray burst count data comparison is
made to cosmological source models. While simple models can fit <V/Vmax> and
faint end slope constraints, the addition of a logarithmic count range variable
describing the curvature of the counts shows that models with no evolution or
evolution power law in redshift with index less than 10 fail to satisfy
simultaneously all three descriptors of the burst data. The cosmological source
density that would be required for a fit is illustrated.
