{"paper":{"title":"The 1.4 GHz light curve of GRB 970508","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"4), 5), 7), 8) ((1) Amsterdam NL (2) IoA, A.G. de Bruyn (4, AL, Cambridge, C. Kouveliotou (6, C.R. Robinson (6, France (4) NFRA, Huntsville, J. van Paradijs (1, M. Bremer (3), NL (5) Groningen, NL (6) USRA (7) NASA/MSFC, P.J. Groot (1), R.A.M.J. Wijers (2), R.G. Strom (1, T.J. Galama (1), UK (3) IRAM, USA), USA (8) UAH","submitted_at":"1998-04-20T11:13:41Z","abstract_excerpt":"We report on Westerbork 1.4 GHz radio observations of the radio counterpart to $\\gamma$-ray burst GRB~970508, between 0.80 and 138 days after this event. The 1.4 GHz light curve shows a transition from optically thick to thin emission between 39 and 54 days after the event. We derive the slope $p$ of the spectrum of injected electrons ($dN/d\\gamma_{e}\\propto\\gamma_{e}^{-p}$) in two independent ways which yield values very close to $p=2.2$. This is in agreement with a relativistic dynamically near-adiabatic blast wave model whose emission is dominated by synchrotron radiation and in which a sig"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9804190","kind":"arxiv","version":1},"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"}