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Power density spectra (PDSs) of long gamma-ray bursts (GRBs) provide useful information on GRBs, indicating their self-similar temporal structure. The best power-law PDSs are displayed by the longest bursts s) in which the range of self-similar timescales covers more than 2 decades. Shorter (T 90 [ 100 bursts have apparent PDS slopes more strongly a †ected by statistical Ñuctuations. The underlying power law can then be reproduced with high accuracy by averaging the PDSs for a large sample ofdoi:10.1086/308836 fatcat:7o4gytu5z5hidkyco7n2bdggza