{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"ffaa2dc27ef1ad5ecc30535a60a37bf8b6a06192781225c7b62ea402768fb4eb","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["997a83a752692da19c88ef180ae42817b0c36089c368916c3212fcdcaad7ce2c","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"927c82d5d57148631b47033f9791306320741dde75cf50fa6147461d3b8253ba","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":"2","parents":[],"plain":"Some bursts emit photons above $10^{12}\\,\\mathrm{eV}$ 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":"997a83a752692da19c88ef180ae42817b0c36089c368916c3212fcdcaad7ce2c","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 afterglows?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"5aafef5c7e8e0d03d7539de5961338208149efc06e19528361e30d5bb060f74f","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"16569e9ca812be1912a6af267db2dde0bc74ae879425d6e3d3491d7441f69a07","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"PylrkEBmvCp-tJWPYihAzjd4Jry-0bCBIiZPe_BTumRAWF3xsl6oKChlM6eWqVFnZ6B_iPpQWHqMKkX1IT-4CQ"},"schema":"pubphys.envelope/1"},"record_hash":"5aafef5c7e8e0d03d7539de5961338208149efc06e19528361e30d5bb060f74f","leaf_index":2370}