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Title: A universal GRB photon energy-peak luminosity relation
Authors: Willingale, R.
O'Brien, P. T.
Goad, M. R.
Osborne, J. P.
Page, K. L.
Tanvir, N. R.
First Published: 19-Oct-2007
Citation: arXiv:0710.3727 [astro-ph]
Abstract: The energetics and emission mechanism of GRBs are not well understood. Here we demonstrate that the instantaneous peak flux or equivalent isotropic peak luminosity, L_iso ergs s^-1, rather than the integrated fluence or equivalent isotropic energy, E_iso ergs, underpins the known high-energy correlations. Using new spectral/temporal parameters calculated for 101 bursts with redshifts from BATSE, BeppoSAX, HETE-II and Swift we describe a parameter space which characterises the apparently diverse properties of the prompt emission. We show that a source frame characteristic-photon-energy/peak luminosity ratio, K_z, can be constructed which is constant within a factor of 2 for all bursts whatever their duration, spectrum, luminosity and the instrumentation used to detect them. The new parameterization embodies the Amati relation but indicates that some correlation between E_peak and E_iso follows as a direct mathematical inference from the Band function and that a simple transformation of E_iso to L_iso yields a universal high energy correlation for GRBs. The existence of K_z indicates that the mechanism responsible for the prompt emission from all GRBs is probably predominantly thermal.
Version: Pre-print
Type: Preprint
Rights: Copyright © The Author(s), 2007.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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