{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:Z4XTKHOLC3WR25QILQJAUBHYLT","short_pith_number":"pith:Z4XTKHOL","canonical_record":{"source":{"id":"2402.13330","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-02-20T19:15:38Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"60d90470dc640a685e2ca3f81ec7b23e249db8dd941b65af9db89b87c722eb7d","abstract_canon_sha256":"4d3f8d21482521a473e0f215aaf051c490ccb7117a217cbfb803da4b5e446d98"},"schema_version":"1.0"},"canonical_sha256":"cf2f351dcb16ed1d76085c120a04f85cd88675af381c537dbd4bb3b071448697","source":{"kind":"arxiv","id":"2402.13330","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2402.13330","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"arxiv_version","alias_value":"2402.13330v3","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2402.13330","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"pith_short_12","alias_value":"Z4XTKHOLC3WR","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"pith_short_16","alias_value":"Z4XTKHOLC3WR25QI","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"pith_short_8","alias_value":"Z4XTKHOL","created_at":"2026-07-05T08:19:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:Z4XTKHOLC3WR25QILQJAUBHYLT","target":"record","payload":{"canonical_record":{"source":{"id":"2402.13330","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-02-20T19:15:38Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"60d90470dc640a685e2ca3f81ec7b23e249db8dd941b65af9db89b87c722eb7d","abstract_canon_sha256":"4d3f8d21482521a473e0f215aaf051c490ccb7117a217cbfb803da4b5e446d98"},"schema_version":"1.0"},"canonical_sha256":"cf2f351dcb16ed1d76085c120a04f85cd88675af381c537dbd4bb3b071448697","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:19:23.293552Z","signature_b64":"oIQ8rQ+VYuArj1o5bEvTuWJ+mwSlkM6qBKWSWjT52Ovud3Yxj/1O2dgpB18AZS75phxQwWpaGcgdp2hxeqnDAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf2f351dcb16ed1d76085c120a04f85cd88675af381c537dbd4bb3b071448697","last_reissued_at":"2026-07-05T08:19:23.292973Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:19:23.292973Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2402.13330","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:19:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w3X45PNstKxE49grzyBbKtSNg9xzsHv7qEWJfLvZbSMsTAuGi20mkRE4KDywOG2muNYg3MkqjZBb/6r6d3qmAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T13:33:05.753454Z"},"content_sha256":"e3c9b26c62e42f476e70d5fb497f5af97f3ab20357886f4774bdb2627f617de1","schema_version":"1.0","event_id":"sha256:e3c9b26c62e42f476e70d5fb497f5af97f3ab20357886f4774bdb2627f617de1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:Z4XTKHOLC3WR25QILQJAUBHYLT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Curvature in the very-high energy gamma-ray spectrum of M87","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"A.A. Zdziarski, A. Chen, A. Djannati-Ata\\\"i, A. Dmytriiev, A. Kundu, A. Lemi\\`ere, A. Luashvili, A. Mehta, A. Mitchell, A. Montanari, A.M. Taylor, A. Quirrenbach, A. Reimer, A. Santangelo, A. Wierzcholska, A. Zech, B. Bruno, B. Kh\\'elifi, B. Reville, B. Rudak, C. Boisson, C. Steppa, C. van Eldik, C. Venter, D. Berge, D. Horns, D. Kostunin, D. Malyshev, E. de Ona Wilhelmi, E. Kasai, E. Moulin, E. Ruiz-Velasco, F. Aharonian, F. Ait Benkhali, F. Bradascio, F. Brun, F. Jankowsky, F. Leitl, F. Rieger, F. Sch\\\"ussler, G. Cotter, G. Fontaine, G. Grolleron, G. Mart\\'i-Devesa, G. P\\\"uhlhofer, H. Ashkar, H.E.S.S. collaboration, H.M. Schutte, H. Ren, H. Salzmann, H. Sol, I. Jung-Richardt, I. Lypova, J. Aschersleben, J. Bolmont, J. Celic, J. Chibueze, J. Damascene Mbarubucyeye, J. Djuvsland, J.F. Glicenstein, J. Glombitza, J. Mackey, J. Niemiec, J.N.S. Shapopi, J.-P. Lenain, J. Vink, K. Bernl\\\"ohr, K. Egberts, K. Katarzy\\'nski, K. Kosack, K. Streil, L. Haerer, L. Mohrmann, L. Olivera-Nieto, {\\L}. Stawarz, M. Backes, M. B\\\"ottcher, M. Cerruti, M. de Bony de Lavergne, M. de Naurois, M. Holler, M. Jamrozy, M. Lemoine-Goumard, M. Meyer, M.O. Moghadam, M. Panter, M. Punch, M. Regeard, M. Sasaki, M. Tsirou, M. Zacharias, Nu. Komin, N. Zywucka, O. Chibueze, O. Reimer, P. Zilberman, R. Batzofin, R. Brose, R. Cecil, R.D. Parsons, R.G. Lang, R. Khatoon, R. Marx, R. Moderski, R. Steenkamp, R. Terrier, S. Casanova, S. Chandra, S. Einecke, S. Fegan, S. Funk, S. Gabici, S.J. Wagner, S. Le Stum, S. Ohm, S. Panny, S. Pita, S. Spencer, S. Steinmassl, T. Bulik C. Burger-Scheidlin, T. Bylund, T. Chand, T. Collins, T. L. Holch, T. Murach, T. Takahashi, T. Tanaka, T. Wach, U. Pensec, V. Barbosa Martins, V. Joshi, V. Sahakian, W. Hofmann, W. Klu\\'zniak, Y. Becherini","submitted_at":"2024-02-20T19:15:38Z","abstract_excerpt":"The radio galaxy M87 is a variable very-high energy (VHE) gamma-ray source, exhibiting three major flares reported in 2005, 2008, and 2010. Despite extensive studies, the origin of the VHE gamma-ray emission is yet to be understood. In this study, we investigate the VHE gamma-ray spectrum of M87 during states of high gamma-ray activity, utilizing 20.2$\\,$ hours the H.E.S.S. observations. Our findings indicate a preference for a curved spectrum, characterized by a log-parabola model with extra-galactic background light (EBL) model above 0.3$\\,$TeV at the 4$\\sigma$ level, compared to a power-law"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2402.13330","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2402.13330/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T08:19:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y1U1ewiGR1llgPPYYLKPLjhY2cEGjNsP/Uv9gzec+hIKJ35eG5T5e2ZF6TF8m19Uv6kqOAQmEKCCFjQn7oUfAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T13:33:05.753869Z"},"content_sha256":"97078beef6dbc94936083f87e2085d5a13f778369fa3437384730fdbe894e915","schema_version":"1.0","event_id":"sha256:97078beef6dbc94936083f87e2085d5a13f778369fa3437384730fdbe894e915"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z4XTKHOLC3WR25QILQJAUBHYLT/bundle.json","state_url":"https://pith.science/pith/Z4XTKHOLC3WR25QILQJAUBHYLT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z4XTKHOLC3WR25QILQJAUBHYLT/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-05T13:33:05Z","links":{"resolver":"https://pith.science/pith/Z4XTKHOLC3WR25QILQJAUBHYLT","bundle":"https://pith.science/pith/Z4XTKHOLC3WR25QILQJAUBHYLT/bundle.json","state":"https://pith.science/pith/Z4XTKHOLC3WR25QILQJAUBHYLT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z4XTKHOLC3WR25QILQJAUBHYLT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:Z4XTKHOLC3WR25QILQJAUBHYLT","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":"4d3f8d21482521a473e0f215aaf051c490ccb7117a217cbfb803da4b5e446d98","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-02-20T19:15:38Z","title_canon_sha256":"60d90470dc640a685e2ca3f81ec7b23e249db8dd941b65af9db89b87c722eb7d"},"schema_version":"1.0","source":{"id":"2402.13330","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2402.13330","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"arxiv_version","alias_value":"2402.13330v3","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2402.13330","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"pith_short_12","alias_value":"Z4XTKHOLC3WR","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"pith_short_16","alias_value":"Z4XTKHOLC3WR25QI","created_at":"2026-07-05T08:19:23Z"},{"alias_kind":"pith_short_8","alias_value":"Z4XTKHOL","created_at":"2026-07-05T08:19:23Z"}],"graph_snapshots":[{"event_id":"sha256:97078beef6dbc94936083f87e2085d5a13f778369fa3437384730fdbe894e915","target":"graph","created_at":"2026-07-05T08:19:23Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2402.13330/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The radio galaxy M87 is a variable very-high energy (VHE) gamma-ray source, exhibiting three major flares reported in 2005, 2008, and 2010. Despite extensive studies, the origin of the VHE gamma-ray emission is yet to be understood. In this study, we investigate the VHE gamma-ray spectrum of M87 during states of high gamma-ray activity, utilizing 20.2$\\,$ hours the H.E.S.S. observations. Our findings indicate a preference for a curved spectrum, characterized by a log-parabola model with extra-galactic background light (EBL) model above 0.3$\\,$TeV at the 4$\\sigma$ level, compared to a power-law","authors_text":"A.A. Zdziarski, A. Chen, A. Djannati-Ata\\\"i, A. Dmytriiev, A. Kundu, A. Lemi\\`ere, A. Luashvili, A. Mehta, A. Mitchell, A. Montanari, A.M. Taylor, A. Quirrenbach, A. Reimer, A. Santangelo, A. Wierzcholska, A. Zech, B. Bruno, B. Kh\\'elifi, B. Reville, B. Rudak, C. Boisson, C. Steppa, C. van Eldik, C. Venter, D. Berge, D. Horns, D. Kostunin, D. Malyshev, E. de Ona Wilhelmi, E. Kasai, E. Moulin, E. Ruiz-Velasco, F. Aharonian, F. Ait Benkhali, F. Bradascio, F. Brun, F. Jankowsky, F. Leitl, F. Rieger, F. Sch\\\"ussler, G. Cotter, G. Fontaine, G. Grolleron, G. Mart\\'i-Devesa, G. P\\\"uhlhofer, H. Ashkar, H.E.S.S. collaboration, H.M. Schutte, H. Ren, H. Salzmann, H. Sol, I. Jung-Richardt, I. Lypova, J. Aschersleben, J. Bolmont, J. Celic, J. Chibueze, J. Damascene Mbarubucyeye, J. Djuvsland, J.F. Glicenstein, J. Glombitza, J. Mackey, J. Niemiec, J.N.S. Shapopi, J.-P. Lenain, J. Vink, K. Bernl\\\"ohr, K. Egberts, K. Katarzy\\'nski, K. Kosack, K. Streil, L. Haerer, L. Mohrmann, L. Olivera-Nieto, {\\L}. Stawarz, M. Backes, M. B\\\"ottcher, M. Cerruti, M. de Bony de Lavergne, M. de Naurois, M. Holler, M. Jamrozy, M. Lemoine-Goumard, M. Meyer, M.O. Moghadam, M. Panter, M. Punch, M. Regeard, M. Sasaki, M. Tsirou, M. Zacharias, Nu. Komin, N. Zywucka, O. Chibueze, O. Reimer, P. Zilberman, R. Batzofin, R. Brose, R. Cecil, R.D. Parsons, R.G. Lang, R. Khatoon, R. Marx, R. Moderski, R. Steenkamp, R. Terrier, S. Casanova, S. Chandra, S. Einecke, S. Fegan, S. Funk, S. Gabici, S.J. Wagner, S. Le Stum, S. Ohm, S. Panny, S. Pita, S. Spencer, S. Steinmassl, T. Bulik C. Burger-Scheidlin, T. Bylund, T. Chand, T. Collins, T. L. Holch, T. Murach, T. Takahashi, T. Tanaka, T. Wach, U. Pensec, V. Barbosa Martins, V. Joshi, V. Sahakian, W. Hofmann, W. Klu\\'zniak, Y. Becherini","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-02-20T19:15:38Z","title":"Curvature in the very-high energy gamma-ray spectrum of M87"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2402.13330","kind":"arxiv","version":3},"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:e3c9b26c62e42f476e70d5fb497f5af97f3ab20357886f4774bdb2627f617de1","target":"record","created_at":"2026-07-05T08:19:23Z","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":"4d3f8d21482521a473e0f215aaf051c490ccb7117a217cbfb803da4b5e446d98","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-02-20T19:15:38Z","title_canon_sha256":"60d90470dc640a685e2ca3f81ec7b23e249db8dd941b65af9db89b87c722eb7d"},"schema_version":"1.0","source":{"id":"2402.13330","kind":"arxiv","version":3}},"canonical_sha256":"cf2f351dcb16ed1d76085c120a04f85cd88675af381c537dbd4bb3b071448697","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cf2f351dcb16ed1d76085c120a04f85cd88675af381c537dbd4bb3b071448697","first_computed_at":"2026-07-05T08:19:23.292973Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:19:23.292973Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oIQ8rQ+VYuArj1o5bEvTuWJ+mwSlkM6qBKWSWjT52Ovud3Yxj/1O2dgpB18AZS75phxQwWpaGcgdp2hxeqnDAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T08:19:23.293552Z","signed_message":"canonical_sha256_bytes"},"source_id":"2402.13330","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e3c9b26c62e42f476e70d5fb497f5af97f3ab20357886f4774bdb2627f617de1","sha256:97078beef6dbc94936083f87e2085d5a13f778369fa3437384730fdbe894e915"],"state_sha256":"d210fe4ec87c291f0349445eb22648c23acd10b3eb54b37e387995257772727f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YnvHxjCkPTP4D8kDDx7HaykzMy/KX+D5vNru4BYGPy5BQqqyfOEzs2UOeqYv3wqW7biobOVmUBXvloxZIOS4Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T13:33:05.756769Z","bundle_sha256":"5e6ab94cc1e18c92493fecd46d294bf79ddc8c398380d6efb57fdf00c8f07095"}}