{"paper":{"title":"Revealing characteristics of dark GRB 150309A: dust extinguished or high-z?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Aryan, A. F. Valeev, A. Gerarts, A. J. Castro-Tirado, A. K. Ror, A. Mart\\'in-Carrillo, A. Nicuesa Guelbenzu, B.-B. Zhang, E. Fern\\'andez-Garc\\'ia, I. H. Park, I. Olivares, I. P\\'erez-Garc\\'ia, J. Cepa, J. C. Tello, J. M. Castro Cer\\'on, K. Ackley, M. A. Castro Tirado, M. D. Caballero-Garc\\'ia, M. Gritsevich, M. Jel\\'inek, P. Ferrero, Rahul Gupta, R. Cunniffe, R. S\\'anchez-Ram\\'irez, S. B. Pandey, S. Eikenberry, S. Guziy, S. Jeong, S. R. Oates, V. V. Sokolov, Y.-D. Hu","submitted_at":"2023-10-12T17:02:09Z","abstract_excerpt":"Dark GRBs constitute a significant fraction of the GRB population. In this paper, we present the multiwavelength analysis of an intense two-episodic GRB 150309A observed early on to ~114 days post-burst. Despite the strong gamma-ray emission, no optical afterglow was detected for this burst. However, we discovered near-infrared afterglow ($K_{\\rm S}$-band), ~5.2 hours post burst, with the CIRCE instrument mounted at the 10.4m GTC. We used Fermi observations of GRB 150309A to understand the prompt emission mechanisms and jet composition. We performed the early optical observations using the BOO"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2310.08503","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/2310.08503/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"}