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

Abstract

The observed hard TeV gamma-ray spectrum of the nearby gamma-ray burst (GRB) 190829A may challenge the conventional leptonic GRB afterglow model. It has been proposed that an ultra-high-energy (UHE; ${\epsilon }_{\mathrm{p}}^{{}^{\prime }}\sim 10^{20}$ eV) proton population can be pre-accelerated by internal shocks in GRB jets. We study possible signatures of the UHE protons embedded in the TeV afterglows when they escape the afterglow fireball. We show that the leptonic model can represent the observed multiwavelength lightcurves and spectral energy distributions of GRB 190829A by considering the uncertainties of the model parameters. Attributing the TeV gamma-ray afterglows to the emission of both the electron self-Compton scattering process and the UHE proton synchrotron radiations in the afterglow fireball, we obtain tentative upper limits of ${\log }_{10}{\epsilon }_{\mathrm{p}}^{\prime }/\mathrm{eV}\sim 20.46$ and ${\log }_{10}{E}_{\mathrm{p},\mathrm{total}}/\mathrm{erg}\le 50.75$, where $E_{\mathrm{p},\mathrm{total}}$ is the total energy of the proton population. The synchrotron radiations of the UHE protons should dominate the early TeV gamma-ray afterglows, implying that early observations are critical for revealing the UHE proton population.

9 pages, 4 figures, Accepted for Publication in ApJ

References in corpus (23)

• The Physics of Gamma-Ray Bursts and Relativistic Jets
• Time-integrated Neutrino Source Searches with 10 years of IceCube Data
• Synchrotron Self-Compton Analysis of TeV X-ray Selected BL Lacertae Objects
• Teraelectronvolt emission from the $\gamma$-ray burst GRB 190114C
• Energy spectra of gamma-rays, electrons and neutrinos produced at interactions of relativistic protons with low energy radiation
• A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. I. Spectral Components and Their Possible Physical Origins of LAT/GBM GRBs
• Observation of inverse Compton emission from a long $\gamma$-ray burst
• Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow
• On the Momentum Diffusion of Radiating Ultrarelativistic Electrons in a Turbulent Magnetic Field
• High Energy Afterglow from Gamma-ray Bursts
• Multi-wavelength view of the close-by GRB 190829A sheds light on gamma-ray burst physics
• Particle acceleration by relativistic magnetic reconnection driven by kink instability turbulence in Poynting flux dominated jets
• Radio Afterglows of Very High Energy Gamma-Ray Bursts 190829A and 180720B
• Study of the variable broadband emission of Markarian 501 during the most extreme Swift X-ray activity
• 10.4m GTC observations of the nearby VHE-detected GRB 190829A/SN 2019oyw
• Peculiar prompt emission and afterglow in H.E.S.S. detected GRB 190829A
• Monte Carlo simulations for the ANTARES underwater neutrino telescope
• Astrophysics: Extreme emission seen from $\gamma$-ray bursts
• The implications of TeV detected GRB afterglows for acceleration at relativistic shocks
• Constraining the Jet Launching Time of GRB 170817A by Utilizing the Baryon Loading
• Nearby SN-Associated GRB~190829A: Environment, Jet Structure, and VHE Gamma-Ray Afterglows
• Origin for the Prompt Spectral Evolution Characteristics and High Energy Emission during the X-Ray Flare in GRB 180720B
• Afterglow Synchrotron Radiations follow the $L_{\mathrm{p},\mathrm{iso}}-E_{\mathrm{p},\mathrm{z}}-{\Gamma }_0$ relation of Gamma-Ray Bursts? Cases of GRBs 190114C, 130427A, and 180720B

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