{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"513ff473156fec05088a06ea21e948e5aefdece17fa18501584cf2b6daa945db","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["c1e2a1cd2e6fbd4139fbfdc11f91c70a9fb7e50f5c04e9ce96b450ca2deceb7a","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"6a2907b0b323003170566d007cb361b1ccce1915b7f655ef0041f9f4ef2622e6","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"astro.fast-radio-bursts.source-population","kind":"phenomenon","literature_status":"contested","n":"2","parents":[],"plain":"One magnetar in our own galaxy (a neutron star with a magnetic field of about $2 \\times 10^{14}\\ \\mathrm{G}$) has emitted an FRB-like burst, but it is unknown whether magnetars make all FRBs. Bursts also come from an old star cluster and from dead galaxies, where young magnetars should be rare.","posed_since":"2007","precise":"Given the observed FRB population (all-sky rate of order $10^{3}\\,\\text{per day}$ above a few Jy ms at $600\\,\\mathrm{MHz}$, isotropic energies $10^{36} \\text{ to } 10^{43}\\,\\mathrm{erg}$, hosts ranging from star-forming spirals to quiescent ellipticals and a globular cluster of M81), determine which source classes produce it and in what proportions. An answer is a population model (young magnetars, merger-formed or accretion-induced neutron stars, accreting compact binaries, other) that reproduces the energy function, repetition statistics, and host and offset distributions.","problem_ref":"c1e2a1cd2e6fbd4139fbfdc11f91c70a9fb7e50f5c04e9ce96b450ca2deceb7a","references":"","settled_by":"A census of several hundred FRBs localized to parsec-scale environments, combined with X-ray or optical counterparts that fix the progenitor class of individual sources.","status_note":"2025: CHIME Outriggers localized the brightest one-off burst, FRB 20250316A, to a 13 pc region in NGC 4141, where JWST found a faint candidate counterpart consistent with a red giant or a massive star.","title":"Which astrophysical objects produce fast radio 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