External Inverse-Compton Emission from Low-Luminosity Gamma-Ray Bursts: Application to GRB 190829A

Abstract

The detection of TeV gamma-ray bursts (GRBs) brought new opportunities for studying the physics of particle acceleration at relativistic shocks. The \hess telescopes recently observed very-high-energy (VHE) emission from a nearby low-luminosity GRB, GRB 190829A. Follow-up observations with, e.g., Swift-XRT, revealed unusual flare activities at $\sim 10^3\mathrm{s}$, which can be caused by a long-lasting central engine. We show that the VHE emission during the H.E.S.S. observation time is naturally produced in the external inverse-Compton (EIC) scenario, where seed photons supplied by the flares or other late-time dissipation are upscattered to VHE energies by the non-thermal electrons accelerated at the external forward shock. Our calculations show that the EIC flare nearly coincides with the late-prompt flare, but extends $\sim 3-4$ times longer than the duration of the late-prompt flare. The preferred kinetic energy and initial Lorentz factor used in our model are $\sim 10^{52}\mathrm{erg}$ and $\sim 20$, respectively. Understanding the mechanisms of the VHE emission from low-luminosity GRBs will help us constrain the properties of the outflow and the central engine activities, as well as the particle acceleration mechanism.

12 pages, 6 figures, accepted for publication in ApJ. HESS data are added, figures are updated, appendix is extended, main conclusions unchanged

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• Multi-wavelength view of the close-by GRB 190829A sheds light on gamma-ray burst physics
• External Inverse-Compton and Proton Synchrotron Emission from the Reverse Shock as the Origin of VHE Gamma-Rays from the Hyper-Bright GRB 221009A
• Off-axis jet scenario for early afterglow emission of low-luminosity gamma-ray burst GRB 190829A
• The early afterglow of GRB 190829A
• GeV Signatures of Short Gamma-Ray Bursts in Active Galactic Nuclei
• The implications of TeV detected GRB afterglows for acceleration at relativistic shocks
• Synchrotron Self-Compton Emission in the Two-Component Jet Model for Gamma-Ray Bursts
• Analytic Modeling of Synchrotron-Self-Compton Spectra: Application to GRB 190114C
• Multi-wavelength radiation models for low-luminosity GRBs, and the implications for UHECRs
• Multi-wavelength afterglow emission from bursts associated with magnetar flares and fast radio bursts
• Time dependent numerical model for the very high energy emissions of distant gamma-ray busrt GRB 201216C
• Jitter radiation: towards TeV-photons of gamma-ray bursts