{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:N74KLZUJPWPCGWXFDLLWAWTBHL","short_pith_number":"pith:N74KLZUJ","canonical_record":{"source":{"id":"1512.04434","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-14T18:00:00Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"b4541cb9dfa9386ce6da8b0e1486a798b19062b154ee51953c8231b8ea3d97e4","abstract_canon_sha256":"b73dfc1294520c62b232f6b8690532013d96f7ddf60067ce79d8f78dd6bf675c"},"schema_version":"1.0"},"canonical_sha256":"6ff8a5e6897d9e235ae51ad7605a613af354758ab7f870bc0eb4facc61eb9807","source":{"kind":"arxiv","id":"1512.04434","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.04434","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"arxiv_version","alias_value":"1512.04434v1","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.04434","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"pith_short_12","alias_value":"N74KLZUJPWPC","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"N74KLZUJPWPCGWXF","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"N74KLZUJ","created_at":"2026-05-18T12:29:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:N74KLZUJPWPCGWXFDLLWAWTBHL","target":"record","payload":{"canonical_record":{"source":{"id":"1512.04434","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-14T18:00:00Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"b4541cb9dfa9386ce6da8b0e1486a798b19062b154ee51953c8231b8ea3d97e4","abstract_canon_sha256":"b73dfc1294520c62b232f6b8690532013d96f7ddf60067ce79d8f78dd6bf675c"},"schema_version":"1.0"},"canonical_sha256":"6ff8a5e6897d9e235ae51ad7605a613af354758ab7f870bc0eb4facc61eb9807","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:23:53.774373Z","signature_b64":"a1Sj7q0f2y55mQE6EmtfyjAkctckbULCQZs3id5muwlZOuS+CI0eBOdUDs52BThthmRT4II1McBhovT7gLSrBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6ff8a5e6897d9e235ae51ad7605a613af354758ab7f870bc0eb4facc61eb9807","last_reissued_at":"2026-05-18T01:23:53.773592Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:23:53.773592Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.04434","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:23:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RzudQfMoe5WL9rjrLvgkvKE3YwUvpeEB/X+sHI4+JMbwAPZTe3Ev9HNgE+65Maq1gCGb7kq9sESM0GacB+6IBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T18:48:28.303156Z"},"content_sha256":"44e2b1258581c8be2cb8b0daf82c458c1facfce088aa1891287725704c90a3c6","schema_version":"1.0","event_id":"sha256:44e2b1258581c8be2cb8b0daf82c458c1facfce088aa1891287725704c90a3c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:N74KLZUJPWPCGWXFDLLWAWTBHL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gamma rays from the quasar PKS 1441+25: story of an escape","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A. Archer, A. Barnacka, A. C. S. Readhead (OVRO), A. Falcone, A. Flinders, A. Furniss, A. J. Drake, A. Mahabal (CRTS), A. McCann, A. N. Otte, A. O'Faol\\'ain de Bhr\\'oithe, A. Petrashyk, A. Popkow, A. U. Abeysekara, A. Weinstein, A. Wilhelm, A. W. Smith, B. Shappee (ASAS-SN), B. Zitzer (VERITAS), C. A. Johnson, C. S. Kochanek, D. A. Williams, D. Hanna, D. Kieda, D. Nieto, D. Staszak, E. Pueschel, E. Roache, F. Krennrich, G. Gyuk, G. H. Gillanders, G. H. Sembroski, G. Maier, G. M. Madejski (NuSTAR), G. Ratliff, G. T. Richards, H. Fleischhack, H. J. Dickinson, I. Telezhinsky, J. Biteau, J. D. Eisch, J. Dumm, J. Grube, J. H. Buckley, J. Holder, J. L. Christiansen, J. L. Prieto, J. L. Richards, J. P. Finley, J. Quinn, J. Rousselle, J. S. Perkins, J. Tyler, J. V Cardenzana, J. V. Tucci, K. Meagher, K. Ragan, K. Shahinyan, K. Z. Stanek, L. Ciupik, L. Fortson, M. Cerruti, M. Errando, M. H\\\"utten, M. J. Graham, M. J. Lang, M. Krause, M. P. Connolly, M. Pohl, M. Santander, N. H{\\aa}kansson, N. Kelley-Hoskins, N. Park, N. W. Todd, O. M. Weiner, P. Coppi, P. Fortin, P. Kaaret, P. Kar, P. Moriarty, P. S. Smith (SPOL), P. T. Reynolds, Q. Feng, R. A. Ong, R. A. Reeves, R. Bird, R. Mukherjee, S. Archambault, S. G. Djorgovski, S. Griffin, S. Kumar, S. McArthur, S. P. Wakely, S. Vincent, T. Aune, T. B. Humensky, T. Hovatta, T. J. Pearson, T. W.-S. Holoien, V. Bugaev, V. V. Vassiliev, W. Benbow, W. Cui, W. Max-Moerbeck, X. Chen, Y. Khassen","submitted_at":"2015-12-14T18:00:00Z","abstract_excerpt":"Outbursts from gamma-ray quasars provide insights on the relativistic jets of active galactic nuclei and constraints on the diffuse radiation fields that fill the Universe. The detection of significant emission above 100 GeV from a distant quasar would show that some of the radiated gamma rays escape pair-production interactions with low-energy photons, be it the extragalactic background light (EBL), or the radiation near the supermassive black hole lying at the jet's base. VERITAS detected gamma-ray emission up to 200 GeV from PKS 1441+25 (z=0.939) during April 2015, a period of high activity"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.04434","kind":"arxiv","version":1},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:23:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8B0/z7Oa9kzyERAMbVsBBMq/aDmIJ8e59O0drPUQqMUr2Dw3xKlHmiU/7ED7BnN0Cr0HLtShWss8O9LYpaqtDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T18:48:28.303824Z"},"content_sha256":"70db753cf8ee07e5db6f40cd51ac5fd3c9ecd6154ae4453bfed924a86c59b760","schema_version":"1.0","event_id":"sha256:70db753cf8ee07e5db6f40cd51ac5fd3c9ecd6154ae4453bfed924a86c59b760"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/N74KLZUJPWPCGWXFDLLWAWTBHL/bundle.json","state_url":"https://pith.science/pith/N74KLZUJPWPCGWXFDLLWAWTBHL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/N74KLZUJPWPCGWXFDLLWAWTBHL/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":"2026-05-29T18:48:28Z","links":{"resolver":"https://pith.science/pith/N74KLZUJPWPCGWXFDLLWAWTBHL","bundle":"https://pith.science/pith/N74KLZUJPWPCGWXFDLLWAWTBHL/bundle.json","state":"https://pith.science/pith/N74KLZUJPWPCGWXFDLLWAWTBHL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/N74KLZUJPWPCGWXFDLLWAWTBHL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:N74KLZUJPWPCGWXFDLLWAWTBHL","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":"b73dfc1294520c62b232f6b8690532013d96f7ddf60067ce79d8f78dd6bf675c","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-14T18:00:00Z","title_canon_sha256":"b4541cb9dfa9386ce6da8b0e1486a798b19062b154ee51953c8231b8ea3d97e4"},"schema_version":"1.0","source":{"id":"1512.04434","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.04434","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"arxiv_version","alias_value":"1512.04434v1","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.04434","created_at":"2026-05-18T01:23:53Z"},{"alias_kind":"pith_short_12","alias_value":"N74KLZUJPWPC","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"N74KLZUJPWPCGWXF","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"N74KLZUJ","created_at":"2026-05-18T12:29:32Z"}],"graph_snapshots":[{"event_id":"sha256:70db753cf8ee07e5db6f40cd51ac5fd3c9ecd6154ae4453bfed924a86c59b760","target":"graph","created_at":"2026-05-18T01:23:53Z","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":"Outbursts from gamma-ray quasars provide insights on the relativistic jets of active galactic nuclei and constraints on the diffuse radiation fields that fill the Universe. The detection of significant emission above 100 GeV from a distant quasar would show that some of the radiated gamma rays escape pair-production interactions with low-energy photons, be it the extragalactic background light (EBL), or the radiation near the supermassive black hole lying at the jet's base. VERITAS detected gamma-ray emission up to 200 GeV from PKS 1441+25 (z=0.939) during April 2015, a period of high activity","authors_text":"A. Archer, A. Barnacka, A. C. S. Readhead (OVRO), A. Falcone, A. Flinders, A. Furniss, A. J. Drake, A. Mahabal (CRTS), A. McCann, A. N. Otte, A. O'Faol\\'ain de Bhr\\'oithe, A. Petrashyk, A. Popkow, A. U. Abeysekara, A. Weinstein, A. Wilhelm, A. W. Smith, B. Shappee (ASAS-SN), B. Zitzer (VERITAS), C. A. Johnson, C. S. Kochanek, D. A. Williams, D. Hanna, D. Kieda, D. Nieto, D. Staszak, E. Pueschel, E. Roache, F. Krennrich, G. Gyuk, G. H. Gillanders, G. H. Sembroski, G. Maier, G. M. Madejski (NuSTAR), G. Ratliff, G. T. Richards, H. Fleischhack, H. J. Dickinson, I. Telezhinsky, J. Biteau, J. D. Eisch, J. Dumm, J. Grube, J. H. Buckley, J. Holder, J. L. Christiansen, J. L. Prieto, J. L. Richards, J. P. Finley, J. Quinn, J. Rousselle, J. S. Perkins, J. Tyler, J. V Cardenzana, J. V. Tucci, K. Meagher, K. Ragan, K. Shahinyan, K. Z. Stanek, L. Ciupik, L. Fortson, M. Cerruti, M. Errando, M. H\\\"utten, M. J. Graham, M. J. Lang, M. Krause, M. P. Connolly, M. Pohl, M. Santander, N. H{\\aa}kansson, N. Kelley-Hoskins, N. Park, N. W. Todd, O. M. Weiner, P. Coppi, P. Fortin, P. Kaaret, P. Kar, P. Moriarty, P. S. Smith (SPOL), P. T. Reynolds, Q. Feng, R. A. Ong, R. A. Reeves, R. Bird, R. Mukherjee, S. Archambault, S. G. Djorgovski, S. Griffin, S. Kumar, S. McArthur, S. P. Wakely, S. Vincent, T. Aune, T. B. Humensky, T. Hovatta, T. J. Pearson, T. W.-S. Holoien, V. Bugaev, V. V. Vassiliev, W. Benbow, W. Cui, W. Max-Moerbeck, X. Chen, Y. Khassen","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-14T18:00:00Z","title":"Gamma rays from the quasar PKS 1441+25: story of an escape"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.04434","kind":"arxiv","version":1},"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":"sha256:44e2b1258581c8be2cb8b0daf82c458c1facfce088aa1891287725704c90a3c6","target":"record","created_at":"2026-05-18T01:23:53Z","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":"b73dfc1294520c62b232f6b8690532013d96f7ddf60067ce79d8f78dd6bf675c","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-14T18:00:00Z","title_canon_sha256":"b4541cb9dfa9386ce6da8b0e1486a798b19062b154ee51953c8231b8ea3d97e4"},"schema_version":"1.0","source":{"id":"1512.04434","kind":"arxiv","version":1}},"canonical_sha256":"6ff8a5e6897d9e235ae51ad7605a613af354758ab7f870bc0eb4facc61eb9807","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6ff8a5e6897d9e235ae51ad7605a613af354758ab7f870bc0eb4facc61eb9807","first_computed_at":"2026-05-18T01:23:53.773592Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:23:53.773592Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"a1Sj7q0f2y55mQE6EmtfyjAkctckbULCQZs3id5muwlZOuS+CI0eBOdUDs52BThthmRT4II1McBhovT7gLSrBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:23:53.774373Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.04434","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:44e2b1258581c8be2cb8b0daf82c458c1facfce088aa1891287725704c90a3c6","sha256:70db753cf8ee07e5db6f40cd51ac5fd3c9ecd6154ae4453bfed924a86c59b760"],"state_sha256":"e9db9c1b494bb921468526f280736dc717b8757addf3a5ea64fcfd44a0187163"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ew8koC8OlFmOVzRX8fpvvwVICIUgIQRkQXI67ZGwfZeccN3NVnrUNyPHJNuncydudexo/pdRfYVGxD/+QOviBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T18:48:28.307631Z","bundle_sha256":"0b351316e40834950f408d4172c19a7cb5ffa62078c6a4bd753307ead71bb94b"}}