{"paper":{"title":"The Cow: discovery of a luminous, hot and rapidly evolving transient","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Heinze, A. Rest, B. J. Shappee, B. Stalder, C. Ashall, C. Colin, C. S. Kochanek, D. O`Neill, H. A. Flewelling, J. L. Prieto, J. L. Tonry, K. C. Chambers, K. Maguire, K. W. Smith, K. Z. Stanek, L. Denneau, M. D. Stritzinger, M. E. Huber, M. Fulton, M. R. Magee, O. McBrien, P. A. Mazzali, P. Clark, P. Schady, S. J. Prentice, S. J. Smartt, S. Sim, T. A. Thompson, T.-W. Chen, T. W.-S. Holoien","submitted_at":"2018-07-16T16:47:16Z","abstract_excerpt":"We present the ATLAS discovery and initial analysis of the first 18 days of the unusual transient event, ATLAS18qqn/AT2018cow. It is characterized by a high peak luminosity ($\\sim$1.7 $\\times$ 10$^{44}$ erg s$^{-1}$), rapidly evolving light curves ($>$5 mag rise to peak in $\\sim$3.5 days), and hot blackbody spectra, peaking at $\\sim$27000 K that are relatively featureless and unchanging over the first two weeks. The bolometric light curve cannot be powered by radioactive decay under realistic assumptions. The detection of high-energy emission may suggest a central engine as the powering source"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.05965","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":""},"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"}