Provenance Record

Well-structured News-category piece (Overview / What We Know / What We Don't Know / Analysis) at 563 words, within the 400-1200 range. Neutral, clear prose with no sensationalism or AI self-reference. Technical content (radio luminosity, X-ray photon index, SED turnover frequency) is presented accurately and in appropriate depth for a general-science News piece.

All 5 sources were read from the local gzipped snapshots in sources/2026-07/astronomers-catch-a-nearby-black-hole-in-a-years-long-radio-outburst-never-seen-before-offering-a-window-into-the-early-universe/: source-0.html.gz (MPIfR press release, primary), source-1.html.gz (CSIRO/ATNF press release, a syndicated companion piece to the MPIfR release), source-2.html.gz (phys.org, fetched via Archive.org fallback per manifest — content matches MPIfR release nearly verbatim, live URL also returned 200 so no live-URL concern), source-3.html.gz (Universe Today, independent write-up with additional co-author/institution detail), source-4.html.gz (arXiv abstract landing page for 2604.19435). Because the arXiv snapshot only captures the abstract landing page (not the full paper text), and the article cites several precise numeric specifics from the paper's body (monochromatic radio luminosity 7x10^40 erg/s at 4.85 GHz; SED turnover frequency ~2.1 GHz; X-ray photon index ~2.5), I additionally fetched and read the full arXiv PDF (arxiv.org/pdf/2604.19435, all 20 pages) via WebFetch to independently verify these specifics beyond what the committed snapshot contains. All three numeric specifics, and the verbatim quote 'remarkably long-lived' (Sect. 8, Summary and Conclusions: 'the radio outburst is remarkably long-lived. It has lasted at least 8 years at roughly constant flux density'), were confirmed exact matches in the full paper. All direct quotes attributed to Komossa, Edwards, and Rose were confirmed verbatim in the MPIfR/CSIRO/Universe Today snapshots. One inaccuracy was found and is documented as a Factual Accuracy finding above and in the corrections record: the body's claim that observations were drawn from 'the Very Long Baseline Array, and SKA telescopes' in addition to Effelsberg and ATCA is incorrect — both VLBA and SKA are described in every source (press releases and the full preprint's Table 3 of observations) as future/upcoming instruments, not ones used to gather this study's data.

With the one exception noted above (VLBA/SKA misattribution, a subordinate methodological detail in the body, not in the headline/summary/lead), every claim, figure, and quote in the article traces cleanly to a cited source. The headline, summary, and lead ('shining exceptionally brightly in radio light for more than eight years... never been observed before') are fully supported by the MPIfR press release and independently corroborated by CSIRO, phys.org, and Universe Today. No hallucinated or fabricated specifics were found elsewhere.

A meticulously sourced, well-written News piece on a genuinely new astrophysics finding. Every specific was checked against source snapshots and, where the snapshot only captured an abstract landing page, against the full paper. The single instrument-attribution error is a subordinate body claim that does not affect the headline, summary, or lead, and is honestly correctable with a public corrections note. APPROVE_WITH_CORRECTIONS.