{
  "abstract": "A significant fraction of GRB early afterglows exhibit fast and bright X-ray flares, discovered by Swift X-ray Telescope. Their rapid temporal variability and spectral evolution have suggested an internal shock origin, analogous to prompt MeV emission. However, their physical origin and radiation mechanism remain debated. High-energy (> 100 MeV) and very-high-energy (> 30 GeV) gamma-ray observations provide a powerful probe of flare dissipation region, constraining its size, magnetic field strength, and particle acceleration under the synchrotron self-Compton scenario in optically thin relativistic jets. We present a systematic multi-wavelength study of 66 X-ray flares from 47 GRBs observed by X-ray Telescope over 17 years, all within field of view of Fermi Large Area Telescope. We investigate their GeV counterparts and find that only five flares exhibit significant high-energy emission (> 3 sigma). Broadband spectral modeling indicates that this GeV emission is consistent with standard forward shock afterglow. We further investigate correlations between flare spectral properties and energy fluxes at 1 keV, 10 keV, and 1 GeV. Using a synchrotron self-Compton model, we constrain the physical conditions of the emitting region, including magnetic field strength, bulk Lorentz factor, and emission radius. For the most stringent GeV upper limits, we find a magnetic-to-electron luminosity ratio greater than or equal to 1, implying a highly magnetized emitting region. We predict very-high-energy gamma-ray emission from X-ray flares at early (~500s) and late (~5000s) times and assess their detectability with Cherenkov Telescopes. We find that later X-ray flares provide the most promising targets for follow-up observations owing to improved observational accessibility, sensitivity, and reduced response-time constraints of facilities such as Cherenkov Telescope Array Observatory.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.00684",
  "author_total": 8,
  "authors": [
    {
      "name": "Pawan Tiwari"
    },
    {
      "name": "Biswajit Banerjee"
    },
    {
      "name": "Gor Oganesyan"
    },
    {
      "name": "Ansh Chopra"
    },
    {
      "name": "Annarita Ierardi"
    },
    {
      "name": "Marica Branchesi"
    },
    {
      "name": "Stefano Ascenzi"
    },
    {
      "name": "Maria Edvige Ravasio"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0n7gh02pfktc2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.00684",
  "fulltext_url": null,
  "id": "0n7gh02pfktc2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.00684",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3103|Gamma-ray bursts and supernovae"
    ]
  ],
  "openalex": "W7206163413",
  "pdf_url": "https://arxiv.org/pdf/2609.00684",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0n7gh02pfktc2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:00Z",
      "native_id": "2609.00684",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.00684"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "X-ray Flares in Gamma-Ray Bursts at High and Very-High-Energies",
  "title_text": "X-ray Flares in Gamma-Ray Bursts at High and Very-High-Energies",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:00Z",
  "url": "https://research.draconitic.com/paper/0n7gh02pfktc2",
  "venue": "arXiv",
  "versions": []
}