  The cosmological expansion cannot produce the reported correlations of the
gamma-ray burst timescale and spectral energy with peak flux if the burst model
reproduces the BATSE 3B peak-flux distribution for a non-evolving burst source
density. Power law luminosity distribution models proportional to L^{-beta}
produce acceptables fits to the data for most values of the spectral parameters
when beta < 1.6. In this model, gamma-ray bursts of a given peak flux have a
distribution of redshifts, with a maximum redshift of > 3 for peak fluxes near
the BATSE threshold, and with an average redshift of < 1 for all values of peak
flux. The reported correlations of the burst timescale and the spectral energy
with peak flux are systematically 1 standard deviation above the monoluminous
model and 1.5 to 2 standard deviation above the power-law luminosity model.
These results suggest that an intrinsic correlation of burst timescale and
spectral energy with luminosity is present.
