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Title:
Hadronic Models for the Extra Spectral Component in the Short GRB 090510
Authors:
Asano, Katsuaki; Guiriec, Sylvain; Mészáros, Peter
Affiliation:
AA(Interactive Research Center of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan ), AB(University of Alabama in Huntsville, Huntsville, AL 35899, USA ), AC(Department of Astronomy & Astrophysics, Department of Physics, Center for Particle Astrophysics, Pennsylvania State University, University Park, PA 16802, USA )
Publication:
The Astrophysical Journal Letters, Volume 705, Issue 2, pp. L191-L194 (2009). (ApJL Homepage)
Publication Date:
11/2009
Origin:
IOP
ApJ Keywords:
cosmic rays, gamma rays: bursts, gamma rays: theory, radiation mechanisms: non-thermal
DOI:
10.1088/0004-637X/705/2/L191
Bibliographic Code:
2009ApJ...705L.191A

Abstract

A short gamma-ray burst GRB 090510 detected by Fermi shows an extra spectral component between 10 MeV and 30 GeV, an addition to a more usual low-energy (<10 MeV) Band component. In general, such an extra component could originate from accelerated protons. In particular, inverse Compton emission from secondary electron-positron pairs and proton synchrotron emission are competitive models for reproducing the hard spectrum of the extra component in GRB 090510. Here, using Monte Carlo simulations, we test the hadronic scenarios against the observed properties. To reproduce the extra component around GeV with these models, the proton injection isotropic-equivalent luminosity is required to be larger than 1055 erg s-1. Such large proton luminosities are a challenge for the hadronic models.
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