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We demonstrate that distinguishable gamma-ray burst pulses exhibit similarbehaviors as evidenced by correlations among the observable pulse properties ofduration, peak luminosity, fluence, spectral hardness, energy-dependent lag,and asymmetry. Long and Short burst pulses exhibit these behaviors, suggestingthat a similar process is responsible for producing all GRB pulses. That theseproperties correlate in the observer's frame indicates that intrinsiccorrelations are strong enough to not be diluted into insignificance by thedispersion in distances and redshift. We show how all correlated pulsecharacteristics can be explained by hard-to-soft pulse evolution, and wedemonstrate that "intensity tracking" pulses not having these properties arenot single pulses; they instead appear to be composed of two or moreoverlapping hard-to-soft pulses. In order to better understand pulsecharacteristics, we recognize that hard-to-soft evolution provides a moreaccurate definition of a pulse than its intensity variation. This realization,coupled with the observation that pulses begin near-simultaneously across awide range of energies, leads us to conclude that the observed pulse emissionrepresents the energy decay resulting from an initial injection, and that onesimple and as yet unspecified physical mechanism is likely to be responsiblefor all gamma-ray burst pulses regardless of the environment in which they formand, if GRBs originate from different progenitors, then of the progenitors thatsupply them with energy.

Unification of Pulses in Long and Short Gamma-Ray Bursts: Evidence from Pulse Properties and their Correlations