Origin of the GeV Emission During the X-ray Flaring Activity in GRB 100728A
Hao-Ning He, Bin-Bin Zhang, Xiang-Yu Wang, Zhuo Li, Peter M\'esz\'aros
TL;DR
This paper investigates the origin of GeV emission during X-ray flares in GRB 100728A, proposing that external inverse-Compton scattering of X-ray flare photons by relativistic electrons explains the observed emission.
Contribution
It demonstrates that anisotropic external inverse-Compton scattering can account for the temporal and spectral features of GeV emission during X-ray flares in GRBs.
Findings
External inverse-Compton scattering explains GeV emission.
Anisotropic scattering effects are crucial for modeling.
The scenario reproduces observed temporal and spectral properties.
Abstract
Recently, Fermi-LAT detected GeV emission during the X-ray flaring activity in GRB 100728A. We study various scenarios for its origin. The hard spectrum of the GeV emission favors the external inverse-Compton origin in which X-ray flare photons are up-scattered by relativistic electrons in the external forward shock. This external IC scenario, with anisotropic scattering effect taken into account, can reproduce the temporal and spectral properties of the GeV emission in GRB 100728A.
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