Interpretation of the unprecedentedly long-lived high-energy emission of GRB 130427A

Abstract

High energy photons (>100 MeV) are detected by the Fermi/LAT from GRB 130427A up to almost one day after the burst, with an extra hard spectral component being discovered in the high-energy afterglow. We show that this hard spectral component arises from afterglow synchrotron-self Compton emission. This scenario can explain the origin of >10 GeV photons detected up to ~30000s after the burst, which would be difficult to be explained by synchrotron radiation due to the limited maximum synchrotron photon energy. The lower energy multi-wavelength afterglow data can be fitted simultaneously by the afterglow synchrotron emission. The implication of detecting the SSC emission for the circumburst environment is discussed.

4 pages, 2 figures, ApJL in press

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• Two Predictions of supernova: GRB 130427A / SN 2013cq and GRB 180728A / SN 2018fip
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• Probing gamma-ray bursts observed at very high energies through their afterglow
• Multi-messenger astronomy with very-high-energy gamma-ray observations
• Hard TeV Gamma-Ray Afterglows of Nearby GRB 190829A as a Tentative Signature of Ultra-High-Energy Cosmic Rays Accelerated in Gamma-Ray Burst Jets
• Probing Gamma-Ray Burst afterglows with the Cherenkov Telescope Array
• Relativistic shock acceleration and some consequences
• Spectral Diversities of Gamma-ray Bursts in High Energy Bands: Hints from Turbulent Cascade
• New Insights on Gamma-Ray Burst Radiation Mechanisms from Multiwavelength Observations
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• Magnetar giant flare origin for GRB 200415A inferred from a new scaling relation and its implications