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A. Toale, P. Berghaus, P. B. Price, P. Desiati, Peter E. Nugent, P. Gretskov, Phil A. Evans, P. O. Hulth, P. Redl, P. Zarzhitsky, R. Bay, R. Eagan, R. Gaior, R. G. Stokstad, R. Hellauer, R. Hoffmann, R. Koirala, R. Konietz, R. Maruyama, R. Maunu, R. Morse, R. Nahnhauer, R. Reimann, R. Shanidze, R. Str\\\"om, S. BenZvi, S. B\\\"oser, S. C. Nowicki, S. Coenders, S. De Ridder, S. Euler, S. Fahey, S. Flis, S. Hickford, Shrinivas R. Kulkarni, S. In, S. J. Smartt (for the Pan-STARRS1 Science Consortium), S. Kopper, S. Miarecki, S. M. Saba, S. Richter, S. R. Klein, S. Robertson, S. Sarkar, S. Schoenen, S. Sch\\\"oneberg, S. Seunarine, S. Ter-Antonyan, S. Tilav, S. Vallecorsa, S. Vanheule, S. W. Barwick, S. Westerhoff, S. Yoshida, T. Anderson, T. C. Arlen, T. DeYoung, T. Ehrhardt, T. Fischer-Wasels, T. Fuchs, T. Gl\\\"usenkamp, T. Karg, T. K. Gaisser, T. Kuwabara, T. Menne, T. Meures, T. Montaruli, Tom Barlow, T. Palczewski, T. Ruhe, T. R. Wood, T. Schmidt, T. Stanev, T. Stezelberger, U. Naumann, V. Baum, W. Huelsnitz, W. Rhode, W. S. Burgett, X. Bai, X. W. Xu, Y. Xu","submitted_at":"2015-06-09T21:56:53Z","abstract_excerpt":"The IceCube neutrino observatory pursues a follow-up program selecting interesting neutrino events in real-time and issuing alerts for electromagnetic follow-up observations. In March 2012, the most significant neutrino alert during the first three years of operation was issued by IceCube. In the follow-up observations performed by the Palomar Transient Factory (PTF), a Type IIn supernova (SN) PTF12csy was found $0.2^\\circ$ away from the neutrino alert direction, with an error radius of $0.54^\\circ$. 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