{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a204860d168c3a94d2f670ee5fd57c9d42bd3c7b74f6885eac27e72bf9a33edf","created":"2026-10-03T07:17:55Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"358cf25e8fe76d5fb777827d6c83a6551b0ef9a1662ddc3d248c37e4223b33f4","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"astro.grb-engines-jets.engine-identity","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"The engine could be a fast-spinning, highly magnetized neutron star or a newborn black hole swallowing a disk; each leaves different marks in the X-ray afterglow.","posed_since":"","precise":"For long and short GRBs, determine whether the engine is a millisecond proto-magnetar (rotational energy at most $\\sim 2e52\\ \\mathrm{erg}$, X-ray plateau followed by $L\\sim t^{-2}$ decay) or a hyperaccreting black hole (Blandford-Znajek power with fall-back accretion L ~ t^-5/3). 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