{"paper":{"title":"A detailed study of the optical attenuation of gamma-ray bursts in the Swift era","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Cucchiara, A. M. Watson, A. S. Kutyrev, C. G. Rom\\'an-Z\\'u\\~niga, C. R. Klein, E. Ramirez-Ruiz, E. Troja, H. Moseley, J. A. de Diego, J. Gonz\\'alez, J. S. Bloom, J. X. Prochaska, L. Georgiev, M. G. Richer, N. Gehrels, N. R. Butler, O. D. Fox, O. M. Littlejohns, W. H. Lee","submitted_at":"2014-12-19T21:00:12Z","abstract_excerpt":"We present optical and near-infrared (NIR) photometry of 28 gamma-ray bursts (GRBs) detected by the \\textit{Swift} satellite and rapidly observed by the Reionization and Transients Infrared/Optical (RATIR) camera. We compare the optical flux at fiducial times of 5.5 and 11 hours after the high-energy trigger to that in the X-ray regime to quantify optical darkness. 46$\\pm$9 per cent (13/28) of all bursts in our sample and 55$\\pm$10 per cent (13/26) of long GRBs are optically dark, which is statistically consistently with previous studies. Fitting RATIR optical and NIR spectral energy distribut"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1412.6530","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":""},"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"}