{"paper":{"title":"Discovery of the optical and radio counterpart to the fast X-ray transient EP240315a","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Andersson, A. J. Cooper, A. Rest, C.-C. Lin, C.-C. Ngeow, D. R. Young, E. A. Magnier, F. Carotenuto, F. J. Cowie, G. Pignata, H. F. Stevance, H. Gao, H.-Y. Miao, I. A. Smith, J. Bright, J. Herman, J. H. Gillanders, J. L. Tonry, J. Weston, K. C. Chambers, K. W. Smith, L. Rhodes, M. D. Fulton, M. E. Huber, M. Nicholl, N. Erasmus, P. G. Jonker, P. Minguez, R. Fender, R. J. Wainscoat, S. J. Smartt, S. Srivastav, S. Yang, T. deBoer, T. Lowe, T. Moore, T.-W. Chen, X. Sheng, Y.-C. Pan","submitted_at":"2024-04-16T15:37:09Z","abstract_excerpt":"Fast X-ray Transients (FXTs) are extragalactic bursts of soft X-rays first identified >10 years ago. Since then, nearly 40 events have been discovered, although almost all of these have been recovered from archival Chandra and XMM-Newton data. To date, optical sky surveys and follow-up searches have not revealed any multi-wavelength counterparts. The Einstein Probe, launched in January 2024, has started surveying the sky in the soft X-ray regime (0.5-4 keV) and will rapidly increase the sample of FXTs discovered in real time. Here, we report the first discovery of both an optical and radio cou"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.10660","kind":"arxiv","version":3},"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/2404.10660/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"}