{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"5102539c52dc32fa560f707bef484cd37ab78ab8e24215c5898c073c9af432bd","created":"2026-10-03T07:17:55Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"8bbffada1301bd1f0effc1e49df3115efaa4758ab88b041acd59129db01e66ca","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"astro.grb-engines-jets.tev-afterglow","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Some bursts emit photons above $1e12\\,\\mathrm{eV}$ for hours after the explosion, more energetic than electrons spiraling in the shock's magnetic field are thought able to make.","posed_since":"2019","precise":"GRB 180720B, 190114C, 190829A and 221009A (photons up to $\\sim 1\\mathrm{e}13\\,\\mathrm{eV}$ with LHAASO) show TeV afterglows. Determine whether synchrotron self-Compton emission from the forward shock, synchrotron emission beyond the classical maximum ($\\sim 50\\,\\Gamma\\,\\mathrm{MeV}$ for bulk Lorentz factor $\\Gamma$), or hadronic processes produce them, and what the resolved TeV onset implies for the initial Lorentz factor and the surrounding density. Answer: a mechanism with physical parameters consistent across all TeV bursts.","problem_ref":null,"references":"","settled_by":"Simultaneous X-ray and TeV spectra over the afterglow of several bursts that either show the separate inverse-Compton component or a single synchrotron spectrum.","status_note":"2021: H.E.S.S. found the X-ray and TeV spectra of GRB 190829A consistent with one synchrotron component extending past the standard maximum energy; 2023: LHAASO resolved the TeV onset of GRB 221009A.","title":"What emits the TeV photons in gamma-ray burst 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