Gamma-Ray Burst Peak Duration as a Function of Energy
arXiv:astro-ph/9504075 · doi:10.1086/309603
Abstract
Gamma-ray burst time histories often consist of many peaks. These peaks tend to be narrower at higher energy. If gamma-ray bursts are cosmological, the energy dependence of gamma-ray burst time scales must be understood in order to correct the time scale dependence due to the expansion of the universe. By using the average autocorrelation function and the average pulse width, we show that the narrowing with energy follows, quite well, a power law. The power law index is about -0.4. This is the first quantitative relationship between temporal and spectral structure in gamma-ray bursts. It is unclear what physics causes this relationship. The average autocorrelation has a universal shape such that one energy range scales linearly with time into all other energy ranges. This shape is approximately the sum of two exponential.
19 pages plus figures, uuencoded tar compressed Postscript. Submitted for publication. Also available in Postscript format at ftp://sstcx1.lanl.gov/pub/grb/energy_stretch.ps
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