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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 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