{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:LURHTBRXEH4KJPSR7IGZW6S3A4","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"052d8b049f777ed3edaad44292784e2b5ed6d19f16940f735f99a69cf2198da8","cross_cats_sorted":["hep-ex","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-04-20T09:14:48Z","title_canon_sha256":"c408f7e29793121bca04908a07fa438cad3cc03bd6526a2bf7714eb325ee81de"},"schema_version":"1.0","source":{"id":"1304.5614","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.5614","created_at":"2026-05-18T03:05:26Z"},{"alias_kind":"arxiv_version","alias_value":"1304.5614v2","created_at":"2026-05-18T03:05:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.5614","created_at":"2026-05-18T03:05:26Z"},{"alias_kind":"pith_short_12","alias_value":"LURHTBRXEH4K","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_16","alias_value":"LURHTBRXEH4KJPSR","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_8","alias_value":"LURHTBRX","created_at":"2026-05-18T12:27:51Z"}],"graph_snapshots":[{"event_id":"sha256:2261f79a6ca9513f261dbb47ccc26ba04e879ab9b25ebfa47a02a63f68de2655","target":"graph","created_at":"2026-05-18T03:05:26Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We search for ultra-high energy photons by analyzing geometrical properties of shower fronts of events registered by the Telescope Array surface detector. By making use of an event-by-event statistical method, we derive upper limits on the absolute flux of primary photons with energies above 10^19, 10^19.5 and 10^20 eV based on the first three years of data taken.","authors_text":"A.L. Sampson, A. Oshima, A. Taketa, B.G. Cheon, B.K. Shin, B.T. Stokes, C.C.H. Jui, D.C. Rodriguez, D. Gorbunov, D. Ikeda, D. Ivanov, D. Oku, D.R. Bergman, D. Ryu, E. Barcikowski, E.J. Cho, E. Kido, F. Kakimoto, F. Shibata, G.B. Thomson, G.I. Rubtsov, G. Vasiloff, H.B. Kim, H. Fujii, H. Kawai, H.K. Kim, H. Ohoka, H. Sagawa, H. Shimodaira, H. Tanaka, H. Tokuno, H. Ukai, H. Yamaoka, H. Yoshii, I.H. Park, I. Myers, I. Tkachev, J. Chiba, J.D. Smith, J.H. Kim, J.I. Shin, J. Lan, J.N. Matthews, J.W. Belz, J. Yang, K. Hayashi, K. Hibino, K. Hiyama, K. Honda, K. Ikuta, K. Kadota, K. Kasahara, K. Kitamoto, K. Kobayashi, K. Kuramoto, K. Martens, K. Miyata, K. Nagasawa, K. Oki, K. Tanaka, K. Tsutsumi, K. Yamazaki, L.M. Scott, M. Allen, M. Chikawa, M. Fukushima, M. Minamino, M. Ohnishi, M.S. Pshirkov, M. Takeda, M. Takita, M. Tanaka, M. Wood, N. Hayashida, N. Inoue, N. Sakurai, O. Kalashev, P.D. Shah, P. Sokolsky, P. Tinyakov, R. Aida, R. Anderson, R. Azuma, R. Cady, R. Ishimori, R. Yamane, R. Zollinger, S.A. Blake, S.B. Thomas, S.I. Lim, S. Iwamoto, S. Kawakami, S. Kawana, S. Kitamura, S. Machida, S. Nagataki, S. Ogio, S. Ozawa, S.R. Stratton, S. Suzuki, S. Troitsky, S. Udo, S.W. Nam, S. Yoshida, S.Y. Roh, T. Abu-Zayyad, T. Fujii, T. Fukuda, T. Iguchi, T. Ishii, T. Kanbe, T. Matsuda, T. Matsuura, T. Matsuyama, T. Nakamura, T. Nonaka, T. Okuda, T. Shibata, T. Shirahama, T. Stroman, T. Tomida, T. Wong, V. Kuzmin, W. Hanlon, W.R. Cho, X. Zhou, Y. Hayashi, Y.J. Kwon, Y. Kitamura, Y. Kobayashi, Y. Kondo, Y. Murano, Y. Takahashi, Y. Tameda, Y. Tsunesada, Y. Tsuyuguchi, Y. Uchihori, Y. Wada, Y. Yamakawa, Y. Yoneda, Z. Zundel","cross_cats":["hep-ex","hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-04-20T09:14:48Z","title":"Upper limit on the flux of photons with energies above 10^19 eV using the Telescope Array surface detector"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.5614","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:7a748578eb761a2fe29f30d83667c32375693ec5f81025a22d7e7f8c8fe23dd8","target":"record","created_at":"2026-05-18T03:05:26Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"052d8b049f777ed3edaad44292784e2b5ed6d19f16940f735f99a69cf2198da8","cross_cats_sorted":["hep-ex","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-04-20T09:14:48Z","title_canon_sha256":"c408f7e29793121bca04908a07fa438cad3cc03bd6526a2bf7714eb325ee81de"},"schema_version":"1.0","source":{"id":"1304.5614","kind":"arxiv","version":2}},"canonical_sha256":"5d2279863721f8a4be51fa0d9b7a5b071d10c2cd067ad6f6e85e915d92039130","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5d2279863721f8a4be51fa0d9b7a5b071d10c2cd067ad6f6e85e915d92039130","first_computed_at":"2026-05-18T03:05:26.117142Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:05:26.117142Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CEAX5xygGv4Dys1zUNDCylqk67+K5QuqosV31KGiEPFJ+/GWMtNnA8rxt0VdTYoKDviv7kpqY2CucvhhQ+ErBg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:05:26.117782Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.5614","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7a748578eb761a2fe29f30d83667c32375693ec5f81025a22d7e7f8c8fe23dd8","sha256:2261f79a6ca9513f261dbb47ccc26ba04e879ab9b25ebfa47a02a63f68de2655"],"state_sha256":"5c18b518620843110887f16ada90135c2e29e90a4b27504838ba8de1853d2e53"}