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Gamma-ray bursts (GRBs) come in two types, short and long. The distributionof logarithmic durations of long GRBs is asymmetric rather than Gaussian. Suchan asymmetry, when modelled with a mixture of Gaussian distributions, requiresan introduction of an additional component, often associated with another classof GRBs. However, when modelled with inherently asymmetric distributions, thereis no need for such a component. The cosmological dilation was already ruledout as a source of the asymmetry, hence its origin resides in the progenitors.GRB light curves (LCs) are usually well described by a series offast-rise-exponential-decay pulses. A statistical analysis of ensembles ofsimulated LCs shows that the asymmetry is a natural consequence of the pulseshape and the multi-pulse character of the LCs.

How does the shape of gamma-ray bursts' pulses affect the duration distribution?