{
  "abstract": "The bright, variable early X-ray emission of GRB 241030A at z = 1.411 motivates investigating continued central-engine activity before the smoother afterglow emerges. We model a possible underlying magnetar contribution to the unabsorbed 0.3–10 keV XRT flux over 80–430 s, evolving the spin under fallback-disk and electromagnetic torques. A descriptive estimate gives P0 ≃ 4.25 ms, B ≃ 3.04 × 1015 G and source-frame tfb ≃ 143 s, with exploratory temporal-block uncertainty ranges. The effective efficiency reaches its geometry-dependent ceiling of 81.2. At observer time 200 s, this realization has P* ≃ 4.82 ms and magnetospheric, corotation and light-cylinder radii rm ≃ 235 km, rco ≃ 48 km and rLC ≃ 230 km. It is on the ejector branch; light-cylinder entry near 255 s initiates negative propeller torque and steepens the decline. The smooth component declines throughout the fitted interval; additional variable emission contributes to the observed maximum near 180 s. A correlated-residual Bayesian analysis permits a fainter component and broader dynamical histories, with median P0 = 16.8 ms and central 68 per cent interval 2.76–286 ms. However, posterior predictive checks reveal that this statistical description typically underpredicts the observed flux level and variability, limiting its physical interpretation. Fallback-modified magnetar activity remains a possible descriptive scenario, but these analyses do not establish a unique underlying component or robust constraints on the initial spin and disk-interaction history. We also discuss Lense–Thirring precession and alternative mechanisms as possible origins of the early X-ray variability.",
  "abstract_shown": true,
  "affiliations": [
    "Instituto de Astronomía, Universidad Nacional Autónoma de México , Circuito Exterior, C.U., A. Postal 70-264, 04510 México City ,",
    "The Pennsylvania State University Department of Astronomy and Astrophysics, , 525 Davey Lab, University Park, PA 16802 ,"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Nissim Fraija"
    },
    {
      "affs": [
        1
      ],
      "name": "Simone Dichiara",
      "orcid": "0000-0001-6849-1270"
    },
    {
      "affs": [
        0
      ],
      "name": "Antonio Galván"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dqasascqthd5b.bib",
  "cited_by": 0,
  "doi": "10.1093/mnras/stag2044",
  "fulltext_url": null,
  "id": "dqasascqthd5b",
  "issns": [
    "0035-8711",
    "1365-2966"
  ],
  "landing_url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2044/9005620",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [],
  "openalex": null,
  "pdf_url": "https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stag2044/72621450/stag2044.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-30",
  "publisher": "Oxford University Press (OUP)",
  "ris": "https://research.draconitic.com/paper/dqasascqthd5b.ris",
  "sources": [
    {
      "first_seen": "2026-10-31T00:20:43Z",
      "native_id": "10.1093/mnras/stag2044",
      "source": "crossref",
      "url": "https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2044/9005620"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "GRB 241030A: A fallback-accreting magnetar description of the early X-ray emission",
  "title_text": "GRB 241030A: A fallback-accreting magnetar description of the early X-ray emission",
  "type": "peer-reviewed",
  "updated_at": "2026-10-31T00:20:43Z",
  "url": "https://research.draconitic.com/paper/dqasascqthd5b",
  "venue": "Monthly Notices of the Royal Astronomical Society",
  "versions": []
}