{"paper":{"title":"X-ray flare in XRF 050406: evidence for prolonged engine activity","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"1), 12), 4), 7), A.A. Wells (8), A.D. Falcone (2), A. Moretti, A. Parsons (6), A.P. Beardmore (8), B. Zhang (5), C. Pagani (2, D.C. Morris, D. Grupe (2), D. Malesani (3), D.N. Burrows (2), G. Chincarini, G. Cusumano (10), G. Tagliaferri (1), J.A. Kennea (2), J. A. Nousek (2), J.E. Hill (6, J.P. Osborne (8), K.L. Page, L. Angelini (6, M. Capalbi (9), M. Perri (9), M.R. Goad, N. Gehrels (6), O. Godet (8), P. Giommi (11), P.L. Banat (1), P. Meszaros, P. Romano, P.T. O'Brien, S. Barthelmy (6), S. Campana, S. Covino (1), S. Kobayashi (2, V. La Parola, V. Mangano (10)","submitted_at":"2006-01-09T13:58:42Z","abstract_excerpt":"We present observations of XRF 050406, the first burst detected by Swift showing a flare in its X-ray light curve. During this flare, which peaks at t_peak ~210s after the BAT trigger, a flux variation of (delta F)/F~6 in a very short time (delta t)/t_peak<<1 was observed. Its measured fluence in the 0.2-10 keV band was ~1.4x10^-8 erg cm^-2, which corresponds to 1-15% of the prompt fluence. We present indications of spectral variations during the flare. We argue that the producing mechanism is late internal shocks, which implies that the central engine is still active at 210s, though with a re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0601173","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0601173/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}