GRB 221009A: A light dark matter burst or an extremely bright Inverse Compton component?

Abstract

Gamma-ray bursts (GRBs) have been considered as potential very high-energy photon emitters due to the large amount of energy released as well as the strong magnetic fields involved in their jets. However, the detection of TeV photons is not expected from bursts beyond a redshift of $z\gtrsim 0.1$ due to their attenuation with the extragalactic background light (EBL). For these reasons, the recent observation of photons with energies of 18 and 251 TeV from GRB 221009A (z=0.151) last October 9th, 2022 has challenged what we know about the TeV-emission mechanisms and the extragalactic background. In order to explain the TeV observations, recent works exploring candidates of dark matter have started to appear. In this paper, we discuss the required conditions and limitations within the most plausible scenario, synchrotron-self Compton (SSC) radiation in the GRB afterglow, to interpret the one 18-TeV photon observation besides the EBL. To avoid the Klein-Nishina effect, we find an improbable value of the microphysical magnetic parameter below $10^{-6}$ for a circumburst medium value $>1\mathrm{c}{\mathrm{m}}^{-3}$ (expected in the collapsar scenario). Therefore, we explore possible scenarios in terms of ALPs and dark photon mechanisms to interpret this highly-energetic photon and we discuss the implications in the GRB energetics. We find that the ALPs and dark photon scenarios can explain the 18 TeV photon but not the 251 TeV photon.

15 pages, 5 figures, 4 tables

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Cited by in corpus (14)

• Observability of the very-high-energy emission from GRB 221009A
• GRB 221009A: An ordinary nearby GRB with extraordinary observational properties
• Invisible Neutrino Decays as Origin of TeV Gamma Rays from GRB221009A
• GRB 221009A Gamma Rays from Radiative Decay of Heavy Neutrinos?
• Constraints on Axion-like Particles from the Observation of GRB 221009A by LHAASO
• Light scalar explanation for 18 TeV GRB 221009A
• Can Sterile Neutrino Explain Very High Energy Photons from GRB221009A?
• GRB 221009A: Spectral signatures based on ALPs candidates
• Observing axions through photon ring dimming of black holes
• Prospects for detection rate of very-high-energy γ-ray emissions from short γ-ray bursts with the HADAR experiment
• Jitter Mechanism as a Kind of Coherent Radiation: Constrained by the GRB 221009A Emission at 18 TeV
• Constraints on axion-like particles from ultra-high-energy observations of M87 with the HAWC observatory
• Photon Ring Dimming as a Signature of Photon-Axion Conversion in Janis-Newman-Winicour Naked Singularity
• Axion-like Particles and their Possible Impact on the Very High-Energy Spectrum of M87 Observed by LHAASO