{"paper":{"title":"GRB 990704: the most X-ray rich BeppoSAX gamma-ray burst","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"E. Costa (IAS/CNR), E. Pian (OAT, F. Frontera (ITESRE, Itesre), J. Heise (SRON), J.J.M. in 't Zand (SRON), L.A. Antonelli (OAR), L. Amati (ITESRE/CNR), L. Nicastro (IFCAI/CNR), L. Piro (IAS/CNR), M. Feroci (IAS/CNR), P. Soffitta (IAS/CNR), Univ. Ferrara)","submitted_at":"2001-08-27T14:35:37Z","abstract_excerpt":"We present the X- and $\\gamma$-ray detection of GRB 990704 and the discovery and study of its X-ray afterglow, 1SAX J1219.5-0350. Two pointed BeppoSAX observations with the narrow field instruments were performed on this source, separated in time by one week. The decay of the X-ray flux within the first observation appears unusually slow, being best-fit by a power law with negative index 0.83$\\pm$0.16. Such a slow decay is consistent with the non-detection in our second observation, but its back-extrapolation to the time of the GRB largely underestimates the detected GRB X-ray prompt emission."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0108414","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"}