{"paper":{"title":"Chandra Orion Ultradeep Project: Observations and Source Lists","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. A. Muench, C. J. Lada, E. D. Feigelson, E. Flaccomio, F. Damiani, F. R. Harnden, G. Meeus, G. Micela, G. P. Garmire, J. Bally, J. Kastner, J. Li, Jr., K. V. Getman, L. A. Hillenbrand, L. Townsley, M. J. McCaughrean, M. Tsujimoto, N. Grosso, P. S. Broos, S. Sciortino, S. S. Murray, S. Wolk, T. Preibisch, W. Herbst","submitted_at":"2004-10-06T01:47:58Z","abstract_excerpt":"We present a description of the data reduction methods and the derived catalog of more than 1600 X-ray point sources from the exceptionally deep January 2003 Chandra X-ray Observatory observation of the Orion Nebula Cluster and embedded populations around OMC-1. The observation was obtained with Chandra's Advanced CCD Imaging Spectrometer (ACIS) and has been nicknamed the Chandra Orion Ultradeep Project (COUP). With an 838 ks exposure made over a continuous period of 13.2 days, the COUP observation provides the most uniform and comprehensive dataset on the X-ray emission of normal stars ever o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0410136","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"}