{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:URJMCGHHPOFXHXCNHITOF44XFA","short_pith_number":"pith:URJMCGHH","canonical_record":{"source":{"id":"1609.04829","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-15T20:00:15Z","cross_cats_sorted":[],"title_canon_sha256":"fcaa8729dd926566c7926f6859a8de003efbdd2e73da4ada323b3f9ce11939ff","abstract_canon_sha256":"9c297cf7a53eaf3abfaf11a933e562b7655b64a1be05b13634a18f11a6b827e8"},"schema_version":"1.0"},"canonical_sha256":"a452c118e77b8b73dc4d3a26e2f397282d12deb062e1b5af84a0e72613f046d3","source":{"kind":"arxiv","id":"1609.04829","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.04829","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"arxiv_version","alias_value":"1609.04829v1","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.04829","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"pith_short_12","alias_value":"URJMCGHHPOFX","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"URJMCGHHPOFXHXCN","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"URJMCGHH","created_at":"2026-05-18T12:30:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:URJMCGHHPOFXHXCNHITOF44XFA","target":"record","payload":{"canonical_record":{"source":{"id":"1609.04829","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-15T20:00:15Z","cross_cats_sorted":[],"title_canon_sha256":"fcaa8729dd926566c7926f6859a8de003efbdd2e73da4ada323b3f9ce11939ff","abstract_canon_sha256":"9c297cf7a53eaf3abfaf11a933e562b7655b64a1be05b13634a18f11a6b827e8"},"schema_version":"1.0"},"canonical_sha256":"a452c118e77b8b73dc4d3a26e2f397282d12deb062e1b5af84a0e72613f046d3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:32.316880Z","signature_b64":"816hyV2RistQDVzyXIfCJ9qj7okwoY6XHxF5CXwmHX2rIyXv+t0ETNQ2VpS9HS+9/Czn6ltFpRgqeoDQgWc0CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a452c118e77b8b73dc4d3a26e2f397282d12deb062e1b5af84a0e72613f046d3","last_reissued_at":"2026-05-18T01:04:32.316069Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:32.316069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.04829","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":"2026-05-18T01:04:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OevM13bvUy8gHheK3/HTAkrladaUm69dqhsDzyl5fbgmwykVeo3Rt3G3QKSnfy34e4QR3zS2LtwyvrUXrs3xBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T18:04:13.062536Z"},"content_sha256":"0a89fbeefabdfcd5d98e01cab212622c3e964fe963bd4cf735ff01cf937050f3","schema_version":"1.0","event_id":"sha256:0a89fbeefabdfcd5d98e01cab212622c3e964fe963bd4cf735ff01cf937050f3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:URJMCGHHPOFXHXCNHITOF44XFA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical Spectroscopic Observations of Gamma-ray Blazar Candidates. V. TNG, KPNO, and OAN Observations of Blazar Candidates of Uncertain Type in the Northern Hemisphere","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Paggi (SAO), E. Jim\\'enez-Bail\\'on (UNAM), F. La Franca (UniRomaTRE), F. Massaro (UniTO-INFN-TO), F. Ricci (UniRomaTRE), G. Tosti (UniPG), Howard A. Smith (SAO), J. Torrealba (INAOE), L. Latronico (INFN-TO), M. Landoni (INAF), N. \\'Alvarez Crespo (UniTO-INFN), N. Masetti (INAF-IASF-BO), R. D'Abrusco (SAO), V. Chavushyan (INAOE), V. Pati\\~no-\\'Alvarez (INAOE)","submitted_at":"2016-09-15T20:00:15Z","abstract_excerpt":"The extragalactic $\\gamma$-ray sky is dominated by emission from blazars, a peculiar class of active galactic nuclei (AGNs). Many of the $\\gamma$-ray sources included in Fermi -Large Area Telescope Third Source catalog (3FGL) are classified as a blazar candidate of uncertain type (BCU) because there is no optical spectra available in the literature to confirm their nature. In 2013 we started a spectroscopic campaign to look for the optical counterparts of the BCUs and of the Unidentified $\\gamma$-ray Sources. The main goal of our investigation is to confirm the blazar nature of these sources h"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.04829","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":"2026-05-18T01:04:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7w8IYuCJ1fEnsquEH/s2QnGC5A5MI5O3OAScSciNXd2tKHPzFz+yC+9es0u0Xpas090KEZ5CVp8A+yOEYtXiBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T18:04:13.062889Z"},"content_sha256":"97776791855a1eaa88edd6d6748cd859e88fb4f440f23931aed2ee068124484f","schema_version":"1.0","event_id":"sha256:97776791855a1eaa88edd6d6748cd859e88fb4f440f23931aed2ee068124484f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/URJMCGHHPOFXHXCNHITOF44XFA/bundle.json","state_url":"https://pith.science/pith/URJMCGHHPOFXHXCNHITOF44XFA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/URJMCGHHPOFXHXCNHITOF44XFA/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":"2026-05-21T18:04:13Z","links":{"resolver":"https://pith.science/pith/URJMCGHHPOFXHXCNHITOF44XFA","bundle":"https://pith.science/pith/URJMCGHHPOFXHXCNHITOF44XFA/bundle.json","state":"https://pith.science/pith/URJMCGHHPOFXHXCNHITOF44XFA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/URJMCGHHPOFXHXCNHITOF44XFA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:URJMCGHHPOFXHXCNHITOF44XFA","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":"9c297cf7a53eaf3abfaf11a933e562b7655b64a1be05b13634a18f11a6b827e8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-15T20:00:15Z","title_canon_sha256":"fcaa8729dd926566c7926f6859a8de003efbdd2e73da4ada323b3f9ce11939ff"},"schema_version":"1.0","source":{"id":"1609.04829","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.04829","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"arxiv_version","alias_value":"1609.04829v1","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.04829","created_at":"2026-05-18T01:04:32Z"},{"alias_kind":"pith_short_12","alias_value":"URJMCGHHPOFX","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"URJMCGHHPOFXHXCN","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"URJMCGHH","created_at":"2026-05-18T12:30:46Z"}],"graph_snapshots":[{"event_id":"sha256:97776791855a1eaa88edd6d6748cd859e88fb4f440f23931aed2ee068124484f","target":"graph","created_at":"2026-05-18T01:04:32Z","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":"The extragalactic $\\gamma$-ray sky is dominated by emission from blazars, a peculiar class of active galactic nuclei (AGNs). Many of the $\\gamma$-ray sources included in Fermi -Large Area Telescope Third Source catalog (3FGL) are classified as a blazar candidate of uncertain type (BCU) because there is no optical spectra available in the literature to confirm their nature. In 2013 we started a spectroscopic campaign to look for the optical counterparts of the BCUs and of the Unidentified $\\gamma$-ray Sources. The main goal of our investigation is to confirm the blazar nature of these sources h","authors_text":"A. Paggi (SAO), E. Jim\\'enez-Bail\\'on (UNAM), F. La Franca (UniRomaTRE), F. Massaro (UniTO-INFN-TO), F. Ricci (UniRomaTRE), G. Tosti (UniPG), Howard A. Smith (SAO), J. Torrealba (INAOE), L. Latronico (INFN-TO), M. Landoni (INAF), N. \\'Alvarez Crespo (UniTO-INFN), N. Masetti (INAF-IASF-BO), R. D'Abrusco (SAO), V. Chavushyan (INAOE), V. Pati\\~no-\\'Alvarez (INAOE)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-15T20:00:15Z","title":"Optical Spectroscopic Observations of Gamma-ray Blazar Candidates. V. TNG, KPNO, and OAN Observations of Blazar Candidates of Uncertain Type in the Northern Hemisphere"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.04829","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":"sha256:0a89fbeefabdfcd5d98e01cab212622c3e964fe963bd4cf735ff01cf937050f3","target":"record","created_at":"2026-05-18T01:04:32Z","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":"9c297cf7a53eaf3abfaf11a933e562b7655b64a1be05b13634a18f11a6b827e8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-15T20:00:15Z","title_canon_sha256":"fcaa8729dd926566c7926f6859a8de003efbdd2e73da4ada323b3f9ce11939ff"},"schema_version":"1.0","source":{"id":"1609.04829","kind":"arxiv","version":1}},"canonical_sha256":"a452c118e77b8b73dc4d3a26e2f397282d12deb062e1b5af84a0e72613f046d3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a452c118e77b8b73dc4d3a26e2f397282d12deb062e1b5af84a0e72613f046d3","first_computed_at":"2026-05-18T01:04:32.316069Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:04:32.316069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"816hyV2RistQDVzyXIfCJ9qj7okwoY6XHxF5CXwmHX2rIyXv+t0ETNQ2VpS9HS+9/Czn6ltFpRgqeoDQgWc0CQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:04:32.316880Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.04829","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0a89fbeefabdfcd5d98e01cab212622c3e964fe963bd4cf735ff01cf937050f3","sha256:97776791855a1eaa88edd6d6748cd859e88fb4f440f23931aed2ee068124484f"],"state_sha256":"cd7b07ef78c0b1914de62b62cd5743e67aa70bcca4c04463d5653284849a784e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Hi1Jvta8ANW/Ln1/LVAHopKauyRhz1KhlZo2DSjo3rXFeNN4Jkpq3As3BcO9tl24L1SU4taj+xB6469Esw8jDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T18:04:13.065047Z","bundle_sha256":"addc404176848240bd402aa99f8cca6848f11a22d50da3b9912b2159b53ab1f7"}}