{
  "abstract": "Persistent radio sources (PRSs) are the continuum counterparts of fast radio bursts (FRBs), the latter being extragalactic transients of millisecond duration and Jy-level flux density. An FRB-PRS system is thought to be a flaring magnetar surrounded by an highly magnetized, baryon-loaded nebula. We aim to constrain the size of 20181030A-S1, a new PRS candidate, potentially associated with the repeating FRB 20181030A. The latter is localized with $\\sim 1'$ uncertainties in the outskirts of NGC 3252, which is a spiral galaxy at a luminosity distance of $20$ Mpc. We report very long baseline interferometric (VLBI) observations using the European VLBI Network at $1.7$ GHz of this PRS candidate at an angular resolution of $20$ milliarcseconds. Our observations reveal the presence of an unresolved radio source (20181030A-S1) at the position of the PRS candidate, confirming its compactness at milli-arcsecond angular scales. A fit to the position of the point-source yields a peak flux density of $280 \\pm 30$ $μ$Jy and a transverse physical size constrained to be $R < 0.5$ pc at $68\\%$ confidence level (CL). This flux density converts to a spectral luminosity of $(9 \\pm 1) \\times 10^{25}$ erg s$^{-1}$ Hz$^{-1}$, $\\sim 3$ orders of magnitude lower than confirmed PRSs, making 20181030A-S1 the closest and faintest PRS candidate known. Its low luminosity and modest rotation measure are consistent with the $L_ν-$rotation measure (RM) relation followed by confirmed FRB--PRS systems, supporting a common physical origin in magnetar-powered nebulae. We show how a magnetized wind nebula powered by an initially weak ($B_\\star \\simeq 10^{15}$ G) and young ($t_{\\rm age} \\simeq 15 - 150$ yrs) magnetar can account for both the observed spectral luminosity and RM of the system. Other possible origin scenarios for 20181030A-S1, in the case in which it is unrelated to the FRB source, are also discussed.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.35730",
  "author_total": 13,
  "authors": [
    {
      "name": "D. Pelliciari"
    },
    {
      "name": "G. Bernardi"
    },
    {
      "name": "B. Margalit"
    },
    {
      "name": "B. D. Metzger"
    },
    {
      "name": "C. Nanci"
    },
    {
      "name": "L. Bruno"
    },
    {
      "name": "M. Pilia"
    },
    {
      "name": "L. Beduzzi"
    },
    {
      "name": "C. Spingola"
    },
    {
      "name": "C. Stanghellini"
    },
    {
      "name": "P. Esposito"
    },
    {
      "name": "A. Geminardi"
    },
    {
      "name": "M. Giroletti"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6c4ypnvewhzrv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.35730",
  "fulltext_url": null,
  "id": "6c4ypnvewhzrv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.35730",
  "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": "W7214796234",
  "pdf_url": "https://arxiv.org/pdf/2609.35730",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6c4ypnvewhzrv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.35730",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.35730"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Fast radio burst - persistent radio source systems II. A faint PRS associated with the nearby FRB 20181030A?",
  "title_text": "Fast radio burst - persistent radio source systems II. A faint PRS associated with the nearby FRB 20181030A?",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/6c4ypnvewhzrv",
  "venue": "arXiv",
  "versions": []
}