{"paper":{"title":"AT 2019avd: A novel addition to the diverse population of nuclear transients","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Drake, A. Goobar, A. Kawka, A. Malyali, A. Merloni, A. Rau, B. Rusholme, B. Shappee, B. Trakhtenbrot, C. Fremling, C. Ricci, D. Duev, D. Hiramatsu, D. van der Boom, E. Bellm, F. Masci, G. Anderson, I. Arcavi, J. Buchner, J. Burke, J. C. A. Miller-Jones, J. Sollerman, K. Nandra, L. Tartaglia, M. Graham, M. Schramm, M. Soumagnac, R. Walters, S. Frederick, S. Gezari, S. van Velzen, Z. Liu","submitted_at":"2021-01-21T18:18:11Z","abstract_excerpt":"We report on SRG/eROSITA, ZTF, ASAS-SN, Las Cumbres, NEOWISE-R, and Swift XRT/UVOT observations of the unique ongoing event AT 2019avd, located in the nucleus of a previously inactive galaxy at $z=0.029$. eROSITA first observed AT 2019avd on 2020-04-28 during its first all sky survey, when it was detected as an ultra-soft X-ray source ($kT\\sim 85$ eV) that was $\\gtrsim 90$ times brighter in the $0.2-2$ keV band than a previous 3$\\sigma$ upper flux detection limit (with no archival X-ray detection at this position). The ZTF optical light curve in the $\\sim 450$ days preceding the eROSITA detect"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.08760","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/2101.08760/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"}