{"paper":{"title":"A new population of ultra-long duration gamma-ray bursts","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Cucchiara, A. de Ugarte Postigo, A. Gal-Yam, A.J. Levan, A.S. Fruchter, B.A. Zauderer, B.E. Cobb, B. Schmidt, C. Thone, D.A. Perley, D. Bersier, D.B. Fox, D. Malesani, D. Watson, E. Berger, E. Pian, G.A. Wynn, G.C. Brown, G. Tagliaferri, I. Skillen, J. Gorosabel, J. Hjorth, J.P. Osborne, K.L. Page, K. Wiersema, L. Kaper, N.R. Tanvir, O. Vaduvescu, P. Goldoni, P. Jakobsson, P.T. O'Brien, R.A.M.J. Wijers, R. Chornock, R. Karjalainen, R.L.C. Starling, R.L. Tunnicliffe, R. Sanchez-Ramirez, S.B. Cenko, S. Covino, S. Schulze, T. Kruehler","submitted_at":"2013-02-10T18:45:30Z","abstract_excerpt":"We present comprehensive multiwavelength observations of three gamma-ray bursts (GRBs) with durations of several thousand seconds. We demonstrate that these events are extragalactic transients; in particular we resolve the long-standing conundrum of the distance of GRB 101225A (the \"Christmas-day burst\"), finding it to have a redshift z=0.847, and showing that two apparently similar events (GRB 111209A and GRB 121027A) lie at z=0.677 and z=1.773 respectively. The systems show extremely unusual X-ray and optical lightcurves, very different from classical GRBs, with long lasting highly variable "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.2352","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"}