{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"8ad6b01b97a287966ad9a3c730680b51bb19c17f6fdf2026780529130fae5b4e","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1a34de46495672bd272792f95f8c87d5f95f846afeabcdd75e74b7d241e1c4f3","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":"1","parents":[],"plain":"One magnetar in our own galaxy (a neutron star with a magnetic field of about $2e14\\ \\mathrm{G}$) 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 $1e3\\,\\text{per day}$ above a few Jy ms at $600\\,\\mathrm{MHz}$, isotropic energies $1e36 \\text{ to } 1e43\\,\\mathrm{erg}$, 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":null,"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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