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\title{GeV--TeV Lightcurve of GRB Afterglow
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\ShortTitle{}

\author{\speaker{Katsuaki Asano}\\
        Institute for Cosmic Ray Research, The University of Tokyo
 \\
        E-mail: \email{asanok@icrr.u-tokyo.ac.jp
}}

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\abstract{
  We numerically simulate the gamma-ray burst (GRB) afterglow emission with a one-zone time-dependent code. The temporal evolutions of the decelerating shocked shell and energy distributions of electrons and photons are consistently calculated. The photon spectrum and light curves for an observer are obtained taking into account the relativistic propagation of the shocked shell and the curvature of the emission surface. Our results show that even if the emission mechanism is switching from synchrotron to synchrotron self-Compton, the gamma-ray light curves can be a smooth power law, which agrees with the observed light curve and the late detection of a 32 GeV photon in GRB 130427A.
}

\FullConference{7th Fermi Symposium 2017\\
		15-20 October 2017\\
		Garmisch-Partenkirchen, Germany}


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