{"paper":{"title":"Relation between the intrinsic and observed central engine activity time: implications for ultra-long GRBs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"He Gao, Peter M\\'esz\\'aros","submitted_at":"2014-11-10T22:34:41Z","abstract_excerpt":"The GRB central engine intrinsic activity time $T_{\\rm ce}$ is usually described through either the $\\gamma$-ray duration $T_{90}$ or through a generalized burst duration $t_{\\rm burst}$ which includes both the $\\gamma$-ray emission and (when present) an extended flaring X-ray plateau. Here, we define a more specific operational description of $T_{\\rm ce}$, and within the framework of the internal-external shock model, we develop a numerical code to study the relationship between $T_{90}$ and $T_{\\rm ce}$, as well as between $t_{\\rm burst}$ and $T_{\\rm ce}$, for different initial conditions. W"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.2650","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"}