{"paper":{"title":"Observational constraints on the structure of gamma-ray burst jets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Ehud Nakar, Paz Beniamini","submitted_at":"2018-08-22T18:00:21Z","abstract_excerpt":"Motivated by GW170817 we examine constraints that observations put on the angular structure of long gamma-ray burst (GRB) jets. First, the relatively narrow observed distribution of $E_{X}/E_{\\gamma}$ (the isotropic equivalent early X-ray afterglow to prompt $\\gamma$-ray energy ratio) implies that at any angle that $\\gamma$-rays are emitted the Lorentz factor must be high. Specifically, the Lorentz factor of $\\gamma$-ray emitting material cannot drop rapidly with angle, and must be $\\Gamma(\\theta)\\gtrsim 50$ even if there are angles for which the gamma-ray received energy is lower by three ord"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.07493","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}