{
  "abstract": "Very-high-energy photons from gamma-ray bursts (GRBs) are absorbed by the extragalactic background light and partly reprocessed into the GeV band. We update previous estimates of the long-GRB contribution to the Fermi-LAT isotropic gamma-ray background (IGRB), using a time-integrated high-energy afterglow template of GRB 221009A, anchored by GeV-TeV data, together with an explicitly specified scaling with prompt energy and beaming. Despite the observed multi-TeV afterglow, the cascade component reaches only 1.6e-4 of the IGRB. Including direct GeV emission raises the maximum fraction to 1.1e-3, but makes the result more dependent on the population-averaged broadband template. Variations of the extragalactic background light, propagation implementation, intrinsic spectral cutoff, and population prescription do not change the conclusion: the multi-TeV detection of GRB 221009A does not make long GRBs a significant source of the IGRB.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28448",
  "author_total": 1,
  "authors": [
    {
      "name": "S. V. Troitsky"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2cfzkq252ph8d.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28448",
  "fulltext_url": null,
  "id": "2cfzkq252ph8d",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28448",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3103|Gamma-ray bursts and supernovae"
    ]
  ],
  "openalex": "W7204829506",
  "pdf_url": "https://arxiv.org/pdf/2608.28448",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2cfzkq252ph8d.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:45Z",
      "native_id": "2608.28448",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28448"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Reassessing the contribution of long-GRB high-energy afterglows to the isotropic gamma-ray background after GRB 221009A",
  "title_text": "Reassessing the contribution of long-GRB high-energy afterglows to the isotropic gamma-ray background after GRB 221009A",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:45Z",
  "url": "https://research.draconitic.com/paper/2cfzkq252ph8d",
  "venue": "arXiv",
  "versions": []
}