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Thrane, E; Abe, K; Hayato, Y; Iida, T; Ikeda, M; Kameda, J; Kobayashi, K; Koshio, Y; Miura, M; Moriyama, S; Nakahata, M; Nakayama, S; Obayashi, Y; Ogawa, H; Sekiya, H; Suzuki, Y; Takeda, A; Takenaga, Y; Takeuchi, Y; Ueno, K; Watanabe, H; Yamada, S; Vagins, M. R; Hazama, S; Ishihara, C; Kaneyuki, K; Mitsuka, G; Nishino, H; Okumura, K; Tanimoto, N; Dufour, F; Litos, M; Raaf, J. L; Sulak, L. R; Goldhaber, M; Bays, K; Casper, D; Cravens, J. P; Kropp, W. R; Mine, S; Regis, C; Smy, M. B; Sobel, H. W; Hill, J; Keig, W. E; Jang, J. S; Jeong, I. S; Kim, J. Y; Lim, I. T; Fechner, M; Scholberg, K; Walter, C. W; Wendell, R; Tasaka, S; Learned, J. G; Matsuno, S; Watanabe, Y; Ishida, T; Ishii, T; Kobayashi, T; Nakadaira, T; Nakamura, K; Nishikawa, K; Oyama, Y; Sakashita, K; Tsukamoto, T; Suzuki, A. T; Minamino, A; Nakaya, T; Dazeley, S; Svoboda, R; Habig, A; Fukuda, Y; Itow, Y; Tanaka, T; Jung, C. K; Lopez, G; McGrew, C; Yanagisawa, C; Idehara, Y; Ishino, H; Kibayashi, A; Sakuda, M; Yoshida, M; Kim, S. B; Ishizuka, T; Choi, Y; Seo, H. K; Nishijima, K; Yokosawa, Y; Koshiba, M; Totsuka, Y; Heng, Y; Xue, T; Yang, Z; Zhang, H; Kielczewska, D; Mijakowski, P; Dziomba, M; Wilkes, R. J
The Astrophysical journal, 10/2009, Letnik: 704, Številka: 1Journal Article
It has been hypothesized that large fluxes of neutrinos may be created in astrophysical 'cosmic accelerators.' The primary background for a search for astrophysical neutrinos comes from atmospheric neutrinos, which do not exhibit the pointlike directional clustering that characterizes a distant astrophysical signal. We perform a search for neutrino point sources using the upward-going muon data from three phases of operation (SK-I, SK-II, and SK-III) spanning 2623 days of live time taken from 1996 April 1 to 2007 August 11. The search looks for signals from suspected galactic and extragalactic sources, transient sources, and uncataloged sources. While we find interesting signatures from two objects-RX J1713.7-3946 (97.5% CL) and GRB 991004D (95.3% CL)-these signatures lack compelling statistical significance given trial factors. We set limits on the flux and fluence of neutrino point sources above energies of 1.6 GeV.
