Epeak Estimator For Gamma-ray Bursts Observed By Swift BAT

Details Epeak Estimator For Gamma-ray Bursts Observed By Swift BAT Epeak Estimator For Gamma-ray Bursts Observed By Swift BAT

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1704s&link_type=abstract

American Astronomical Society, HEAD meeting #9, #17.04; Bulletin of the American Astronomical Society, Vol. 38, p.380

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Scientific paper

We report a correlation based on the spectral simulation study in the prompt emission spectrum of gamma-ray bursts (GRBs). The correlation is between the photon index derived from a simple
power-law model by the Swift Burst Alert Telescope (BAT) and the Epeak energy, which is the peak energy in the nuF_nu spectrum. We take into account not only the various range of Epeak energies and fluences, but also distributions for both the low-energy photon index and the high-energy photon index in the smoothly broken power-law model. Our correlation is consistent with the photon index observed by BAT and Epeak measured by BAT and other GRB instruments. Since about 80% of GRBs observed by BAT are acceptably fit with the simple power-law model because of the relatively narrow energy range of BAT, this relationship can be used to estimate Epeak for most of the Swift GRBs.

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