{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"6577e65ddb540fc466b09de7066f9594f0eafaee465c5ddccc6e973e6b0b05db","created":"2026-10-03T07:17:55Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"62925c30c78bb622b885bda2153adeb1554ad526b93f671e758a272ce1a07055","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"astro.pulsars-magnetars.long-period-transients","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Radio telescopes have found, mostly since 2022, sources that pulse once every few minutes to hours, far slower than any known pulsar should still emit radio waves.","posed_since":"2005","precise":"Long-period radio transients (periods from $\\sim 1\\,\\mathrm{min}$ to several hours, for example GCRT J1745-3009 at $77\\,\\mathrm{min}$, GLEAM-X J1627-52 at $18\\,\\mathrm{min}$ and GPM J1839-10 at $21\\,\\mathrm{min}$) emit coherent, highly polarized pulses below conventional pulsar death lines. Two, ILT J1101+5521 and GLEAM-X J0704-37, are white dwarf-M dwarf binaries. Determine whether all are white-dwarf systems or whether some are ultra-long-period magnetars, and identify the emission mechanism. Answer: a classification per source with a mechanism consistent with spin-down or binary energy budgets.","problem_ref":null,"references":"","settled_by":"Optical and X-ray identification of counterparts and measured period derivatives for the isolated sources.","status_note":"2024-2025: ILT J1101+5521 (2.1 h) and GLEAM-X J0704-37 (2.9 h) were shown to be white dwarf-M dwarf binaries, while ASKAP J1832-0911 (44 min) showed X-ray pulses at the radio period; the nature of sources without optical companions is debated.","title":"What are the long-period radio 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