{"paper":{"title":"An extremely bright slow-rising afterglow from an off-axis jet in GRB 260310A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alberto J. Castro-Tirado, Alexander Kutyrev, Alfredo Sota, Alzbeta Malenakova, Brendan O'Connor, Daniel Gruen, David Hiriart, Eleonora Troja, Emilio Fern\\'andez-Garc\\'ia, Filip Novotny, Hendrik van Eerten, Hira Waseem, Ignacio P\\'erez-Garc\\'ia, Iv\\'an Agudo, Jan Strobl, Jes\\'us Aceituno, Jorma Ryske, Malte Busmann, Mar\\'ia D. Caballero-Garc\\'ia, Maria Gritsevich, Martin Jel\\'inek, Muskan Yadav, Narjes Shahamat Dehsorkh, Niccol\\'o Passaleva, Roberto Ricci, Rub\\'en S\\'anchez-Ram\\'irez, Sergiy Guziy, Shashi B. Pandey, Simone Dichiara, Siyu Wu, Vincenzo Galluzzi, Yi-Han Iris Yin, You-Dong Hu, Yu-Han Yang","submitted_at":"2026-05-22T16:18:43Z","abstract_excerpt":"We present a multi-wavelength study of GRB 260310A, a nearby long-duration gamma-ray burst at $z\\simeq0.153$ associated with a broad-lined Type Ic supernova. Despite its modest prompt gamma-ray output, $E_{\\gamma,\\rm iso}\\simeq3.5\\times10^{50}$ erg, GRB\\,260310A exhibits one of the brightest afterglows ever observed in the X-ray, optical, and radio bands. Its apparent brightness is not its only remarkable feature. The optical afterglow displays a delayed onset, characterized by a slow rising phase, with slope $\\alpha\\approx-1$, and a late peak at $\\approx$0.1 d. We argue that the combination o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.23818","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.23818/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"}