{"paper":{"title":"Very High Energy outburst of Markarian 501 in May 2009","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Archer, A. Barnacka, A. Bouvier, A. Cesarini, A. C. Rovero, A. Falcone, A. Furniss, A. McCann, A. N. Cillis, A. N. Otte, A. O'Faol\\'ain de Bhr\\'oithe, A. Pichel, A. Popkow, A. S Madhavan, A. Varlotta, A. Weinstein, A. Wilhelm, A. W. Smith, B. Behera, B. Zitzer, C. A. Johnson, C. Skole, D. A. Williams, D. B. Saxon, D. Gall, D. Horan, D. Kieda, D. Nieto, D. Pandel, D. Paneque, D. Staszak, E. Aliu, E. Collins-Hughes, E. Roache, F. Krennrich, F. Sheidaei, G. Gyuk, G. H. Gillanders, G. H. Sembroski, G. Hughes, G. Maier, H. Fleischhack, H. Krawczynski, I. Telezhinsky, J. Becerra G\\'onzalez, J. D. Eisch, J. Dumm, J. Grube, J. H. Buckley, J. Holder, J. Millis, J. P. Finley, J. Quinn, J. Rousselle, J. S. Perkins, J. Tyler, J. V Cardenzana, J. V. Tucci, K. Berger, K. Meagher, K. Ragan, K. Shahinyan, L. Ciupik, L. C. Reyes, L. Fortson, M. Beilicke, M. B\\\"ottcher, M. Buchovecky, M. Cerruti, M.G. Baring, M. H\\\"utten, M. J. Lang, M. Kertzman, M. Krause, M. Orr, M. P. Connolly, M. Pohl, M. Theiling, N. Galante, N. H{\\aa}kansson, N. Kelley-Hoskins, N. Park, N. W. Todd, O. M. Weiner, P. Fortin, P. Kaaret, P. Kar, P. Moriarty, P. T. Reynolds, Q. Feng, R. A. Ong, R. Bird, R. Mukherjee, R. Welsing, S. Archambault, S. Federici, S. Griffin, S. McArthur, S. P. Wakely, S. T. Griffiths, S. Vincent, T. Arlen, T. Aune, T. B. Humensky, (The VERITAS Collaboration), V. Bugaev, V. Pelassa, V. V. Vassiliev, W. Benbow, W. Cui, X. Chen, Y. Khassen","submitted_at":"2016-08-04T15:02:02Z","abstract_excerpt":"The very high energy (VHE; E $>$ 100 GeV) blazar Markarian 501 was observed between April 17 and May 5 (MJD 54938--54956), 2009, as part of an extensive multi-wavelength campaign from radio to VHE. Strong VHE $\\gamma$-ray activity was detected on May 1st with Whipple and VERITAS, when the flux (E $>$ 400 GeV) increased to 10 times the pre-flare baseline flux ($3.9{\\times 10^{-11}}~{\\rm ph~cm^{-2}~s^{-1}}$), reaching five times the flux of the Crab Nebula. This coincided with a decrease in the optical polarization and a rotation of the polarization angle by 15$^{\\circ}$. This VHE flare showed a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.01569","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"}