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Temporal Evolution of GRB Spectra: Leptonic and Hadronic

Published online by Cambridge University Press:  05 September 2012

Katsuaki Asano  and
Peter Mészáros
Katsuaki Asano
Affiliation:
Interactive Research Center of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan email: asano@phys.titech.ac.jp
Peter Mészáros
Affiliation:
Department of Astronomy & Astrophysics; Department of Physics; Center for Particle Astrophysics; Pennsylvania State University, University Park, PA 16802 email: nnp@astro.psu.edu
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Abstract

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As the Fermi observatory has revealed, the GRB light curves show variant behaviours in different energy bands. Especially, the onset of GeV emission tend to lag that at lower energy. Various models to explain the GeV-delay, including early afterglow models or hadronic models, have been proposed. We have developed a time-dependent code for emission processes with one-zone approximation. The temporal evolution of GRB spectra is discussed based on leptonic inverse Compton and hadronic cascade models. This offers important predictions for future observations such as CTA.

Keywords

gamma rays: burstsradiation mechanisms: nonthermalcosmic rays
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S279: Death of Massive Stars: Supernovae and Gamma-Ray Bursts , April 2011 , pp. 319 - 320
Copyright
Copyright © International Astronomical Union 2012

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