{
  "abstract": "Reanalyzing the multi-wavelength data of GRB 240825A, we identify two distinct prompt-emission episodes, i.e. an early, spectrally soft plateau and a subsequent bright, spectrally hard gamma-ray pulse. We show that this signature is consistent with a two-stage central engine model, in which the early soft plateau is powered by the dipolar spin-down radiation of a transient proto-magnetar, while the later hard pulse arises from a relativistic jet launched by fallback accretion onto the nascent black hole via the Blandford-Znajek mechanism. Adopting simulation-motivated initial black hole (BH) masses ($M_{\\rm BH,0}$) and spins ($a_0$), our fits to the second episode yield total masses supplied to the post-collapse disk of $M_{\\rm fb}=0.45$--$0.96 M_\\odot$, fallback radii of $r_{\\rm fb}=16.9$--$17.6 r_g$, and characteristic fallback timescales of $t_{\\rm fb}=0.13$--$0.25$ s. The corresponding maximum inner accretion rates range from $0.18$ to $0.70 M_\\odot \\mathrm{s}^{-1}$, which is sensitive to $a_0$. Joint spectral fits with optical-X-ray afterglow data reveal a coupled temporal evolution of dust extinction and equivalent hydrogen column density. Incorporating this extinction evolution, an external forward-reverse shock model in a wind-like medium can account for the radio-to-GeV band afterglow data. Although ambient dust and the bright host galaxy may obscure any associated supernova, late-time optical reddening remains compatible with a supernova contribution. Applying the empirical relation between the prompt spectral peak energy and the SN peak bolometric magnitude gives an illustrative estimate of $M_{\\rm bol,peak}=-19.46\\pm0.35$ mag for a putative associated SN. These results support a two-stage evolution of the central engine and variable dusty environment of GRB 240825A, which provides insights into the nature of its progenitor.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.15703",
  "author_total": 4,
  "authors": [
    {
      "name": "Ren-Jie Xiong"
    },
    {
      "name": "Zi-Qi Wang"
    },
    {
      "name": "Xiao-Li Huang"
    },
    {
      "name": "En-Wei Liang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6wa46rye13mrg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.15703",
  "fulltext_url": null,
  "id": "6wa46rye13mrg",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.15703",
  "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": "W7221832914",
  "pdf_url": "https://arxiv.org/pdf/2610.15703",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-11",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6wa46rye13mrg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.15703",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.15703"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Revisiting the Multiwavelength Data of GRB 240825A: Implications for a Two-Stage Central Engine and a Dusty Environment",
  "title_text": "Revisiting the Multiwavelength Data of GRB 240825A: Implications for a Two-Stage Central Engine and a Dusty Environment",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/6wa46rye13mrg",
  "venue": "arXiv",
  "versions": []
}