{"paper":{"title":"XL-Calibur -- a second-generation balloon-borne hard X-ray polarimetry mission","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.IM","authors_text":"A.T. West, B.F. Rauch, C. Shreves, E.A. Wulf, F. Imazato, F. Kislat, F. Ryde, G. De Geronimo, H. Awaki, H. Krawczynski, H. Matake, H. Matsumoto, H. Takahashi, H. Tsunemi, K. Hattori, K. Hayashida, K. Tamura, L. Lisalda, M. Errando, M.G. Baring, M. Ishida, M. Kiss, M. Pearce, M. Takeo, N.K. Iyer, N. Uchida, P. Dowkontt, Q. Abarr, R. Bose, R. Yamamoto, S. Spooner, T.-A. Stana, T. Kitaguchi, T. Mineta, T. Miyazawa, T. Mizuno, T. Okajima, T. Tamagawa, V. Guarino, Y. Maeda, Y. Uchida","submitted_at":"2020-10-20T20:37:57Z","abstract_excerpt":"XL-Calibur is a hard X-ray (15-80 keV) polarimetry mission operating from a stabilised balloon-borne platform in the stratosphere. It builds on heritage from the X-Calibur mission, which observed the accreting neutron star GX 301-2 from Antarctica, between December 29th 2018 and January 1st 2019. The XL-Calibur design incorporates an X-ray mirror, which focusses X-rays onto a polarimeter comprising a beryllium rod surrounded by Cadmium Zinc Telluride (CZT) detectors. The polarimeter is housed in an anticoincidence shield to mitigate background from particles present in the stratosphere. The mi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2010.10608","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/2010.10608/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"}