{"paper":{"title":"Small-scale anisotropy of cosmic rays above 10^19eV observed with the Akeno Giant Air Shower Array","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"D. Nishikawa, E. Kusano, F. Kakimoto, H. Ohoka, H. Yoshii, I. Tsushima, K. Honda, K. Kadota, K. Kamata, K. Murakami, K. Shinozaki, M. Nagano, M. Sasaki, M. Takeda, M. Teshima, N. Hayashida, N. Inoue, N. Kawasumi, N. Sakaki, N. Souma, R. Torii, S. Kawaguchi, S. Osone, S. Yoshida, T. Yamamoto, Y. Kawasaki, Y. Matsubara, Y. Uchihori","submitted_at":"1999-02-17T12:51:21Z","abstract_excerpt":"With the Akeno Giant Air Shower Array (AGASA), 581 cosmic rays above 10^19eV, 47 above 4 x 10^19eV, and 7 above 10^20eV are observed until August 1998. Arrival direction distribution of these extremely high energy cosmic rays has been studied. While no significant large-scale anisotropy is found on the celestial sphere, some interesting clusters of cosmic rays are observed. Above 4 x 10^19eV, there are one triplet and three doublets within separation angle of 2.5^o and the probability of observing these clusters by a chance coincidence under an isotropic distribution is smaller than 1 %. Espec"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9902239","kind":"arxiv","version":2},"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"}