Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000nva..conf...49b&link_type=abstract
NEW VISTAS IN ASTROPHYSICS. Proceedings of the International School of Cosmic Ray Astrophysics 20th Anniversary, 11th Course. He
Astronomy and Astrophysics
Astrophysics
Scientific paper
It has recently been proposed that ultrahigh energy (≳ 1019 eV) cosmic rays (UHE-CRs) are accelerated by the blast waves associated with GRBs. We calculate the observed synchrotron spectrum from protons and energetic leptons formed in the cascades initiated by photopion production, taking into account γγ attenuation at the source. Normalizing to the emission characteristics of GRB 970508, we predict ~ 10 MeV - 100 GeV fluxes at a level which may have been observed with EGRET from bright GRBs, and could be detected with the proposed GLAST experiment or with ground-based air Cerenkov telescopes having thresholds ≲ several hundred GeV. The temporal decay of the UHECR-induced high-energy γ-ray afterglows is significantly slower than that of the primary electron synchrotron and associated synchrotron self-Compton (SSC) radiation and thus provides a direct way to test the hadronic origin of a high-energy GRB afterglow. In addition, the short wavelength emission and afterglows can be used to probe the level of the diffuse intergalactic infrared radiation field or constrain redshifts of GRB sources.
Böttcher Markus
Dermer Carles D.
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