{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:ZN6GHEJBNCMY4GHOSODPWXIDL3","short_pith_number":"pith:ZN6GHEJB","canonical_record":{"source":{"id":"1810.06312","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-15T12:41:05Z","cross_cats_sorted":[],"title_canon_sha256":"6f6772ae35e544cfab32b7a9fcbbe5db03b45c27ab6f89b55436a87c6ecd01fc","abstract_canon_sha256":"daa2dcf86b3a668b2969f92a5697f90910c7f60de448bb4935914ec3430ee3c7"},"schema_version":"1.0"},"canonical_sha256":"cb7c63912168998e18ee9386fb5d035ededad8e7554e4e0d1fb2a5f8a9fe1155","source":{"kind":"arxiv","id":"1810.06312","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.06312","created_at":"2026-05-17T23:52:04Z"},{"alias_kind":"arxiv_version","alias_value":"1810.06312v2","created_at":"2026-05-17T23:52:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.06312","created_at":"2026-05-17T23:52:04Z"},{"alias_kind":"pith_short_12","alias_value":"ZN6GHEJBNCMY","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"ZN6GHEJBNCMY4GHO","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"ZN6GHEJB","created_at":"2026-05-18T12:33:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:ZN6GHEJBNCMY4GHOSODPWXIDL3","target":"record","payload":{"canonical_record":{"source":{"id":"1810.06312","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-15T12:41:05Z","cross_cats_sorted":[],"title_canon_sha256":"6f6772ae35e544cfab32b7a9fcbbe5db03b45c27ab6f89b55436a87c6ecd01fc","abstract_canon_sha256":"daa2dcf86b3a668b2969f92a5697f90910c7f60de448bb4935914ec3430ee3c7"},"schema_version":"1.0"},"canonical_sha256":"cb7c63912168998e18ee9386fb5d035ededad8e7554e4e0d1fb2a5f8a9fe1155","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:52:04.810325Z","signature_b64":"9lKRJeKuN9senPiUN6MtLEfHdzN67Nb7A1VeOw9iiESWXj5RCh6J17gfGWGHeOnXeo1ymwjvToXXOIbmja3rAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cb7c63912168998e18ee9386fb5d035ededad8e7554e4e0d1fb2a5f8a9fe1155","last_reissued_at":"2026-05-17T23:52:04.809894Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:52:04.809894Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.06312","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:52:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hZgCdyWake+/xLvHhR4CosHuv0bAcI+I8OsRFl57DS7k2haGu3uhtkwx14awaaGcY/o2CR+nLpxTVfWSNlaYCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T09:41:25.442967Z"},"content_sha256":"172d89e53cb22146773a3b4eb6a42b5c6558dabe96ca72c9119a176ed8a1001d","schema_version":"1.0","event_id":"sha256:172d89e53cb22146773a3b4eb6a42b5c6558dabe96ca72c9119a176ed8a1001d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:ZN6GHEJBNCMY4GHOSODPWXIDL3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Search for AGN counterparts of unidentified Fermi-LAT sources with optical polarimetry: Demonstration of the technique","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Pouliasi, A. Zezas, D. Blinov, E. Angelakis, E. Paleologou, G. V. Panopoulou, I. Liodakis, I. Myserlis, K. Kokolakis, K. Kouroumpatzakis, N. Mandarakas, R. Skalidis, S. Kiehlmann, T. Hovatta, V. Pavlidou","submitted_at":"2018-10-15T12:41:05Z","abstract_excerpt":"The third Fermi-LAT catalog (3FGL) presented the data of the first four years of observations from the Fermi Gamma-ray Space Telescope mission. There are 3034 sources, 1010 of which still remain unidentified. Identifying and classifying gamma-ray emitters is of high significance with regard to studying high-energy astrophysics. We demonstrate that optical polarimetry can be an advantageous and practical tool in the hunt for counterparts of the unidentified gamma-ray sources (UGSs). Using data from the RoboPol project, we validated that a significant fraction of active galactic nuclei (AGN) ass"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.06312","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:52:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H3yJLs5JBLpbL0vs6EpUS0JknZHyxzK0SCeskK+u7STRjc8ip0xd9ZHk5M5FxdKSoPoiW2B0ejOEsODJMnVUAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T09:41:25.443313Z"},"content_sha256":"f4d8adab0a666a841146a91d00bc2b4f79432e78656c99c71ea834b83e597693","schema_version":"1.0","event_id":"sha256:f4d8adab0a666a841146a91d00bc2b4f79432e78656c99c71ea834b83e597693"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZN6GHEJBNCMY4GHOSODPWXIDL3/bundle.json","state_url":"https://pith.science/pith/ZN6GHEJBNCMY4GHOSODPWXIDL3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZN6GHEJBNCMY4GHOSODPWXIDL3/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":"2026-06-03T09:41:25Z","links":{"resolver":"https://pith.science/pith/ZN6GHEJBNCMY4GHOSODPWXIDL3","bundle":"https://pith.science/pith/ZN6GHEJBNCMY4GHOSODPWXIDL3/bundle.json","state":"https://pith.science/pith/ZN6GHEJBNCMY4GHOSODPWXIDL3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZN6GHEJBNCMY4GHOSODPWXIDL3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:ZN6GHEJBNCMY4GHOSODPWXIDL3","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":"daa2dcf86b3a668b2969f92a5697f90910c7f60de448bb4935914ec3430ee3c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-15T12:41:05Z","title_canon_sha256":"6f6772ae35e544cfab32b7a9fcbbe5db03b45c27ab6f89b55436a87c6ecd01fc"},"schema_version":"1.0","source":{"id":"1810.06312","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.06312","created_at":"2026-05-17T23:52:04Z"},{"alias_kind":"arxiv_version","alias_value":"1810.06312v2","created_at":"2026-05-17T23:52:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.06312","created_at":"2026-05-17T23:52:04Z"},{"alias_kind":"pith_short_12","alias_value":"ZN6GHEJBNCMY","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"ZN6GHEJBNCMY4GHO","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"ZN6GHEJB","created_at":"2026-05-18T12:33:07Z"}],"graph_snapshots":[{"event_id":"sha256:f4d8adab0a666a841146a91d00bc2b4f79432e78656c99c71ea834b83e597693","target":"graph","created_at":"2026-05-17T23:52:04Z","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 third Fermi-LAT catalog (3FGL) presented the data of the first four years of observations from the Fermi Gamma-ray Space Telescope mission. There are 3034 sources, 1010 of which still remain unidentified. Identifying and classifying gamma-ray emitters is of high significance with regard to studying high-energy astrophysics. We demonstrate that optical polarimetry can be an advantageous and practical tool in the hunt for counterparts of the unidentified gamma-ray sources (UGSs). Using data from the RoboPol project, we validated that a significant fraction of active galactic nuclei (AGN) ass","authors_text":"A. Pouliasi, A. Zezas, D. Blinov, E. Angelakis, E. Paleologou, G. V. Panopoulou, I. Liodakis, I. Myserlis, K. Kokolakis, K. Kouroumpatzakis, N. Mandarakas, R. Skalidis, S. Kiehlmann, T. Hovatta, V. Pavlidou","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-15T12:41:05Z","title":"Search for AGN counterparts of unidentified Fermi-LAT sources with optical polarimetry: Demonstration of the technique"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.06312","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":"sha256:172d89e53cb22146773a3b4eb6a42b5c6558dabe96ca72c9119a176ed8a1001d","target":"record","created_at":"2026-05-17T23:52:04Z","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":"daa2dcf86b3a668b2969f92a5697f90910c7f60de448bb4935914ec3430ee3c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-10-15T12:41:05Z","title_canon_sha256":"6f6772ae35e544cfab32b7a9fcbbe5db03b45c27ab6f89b55436a87c6ecd01fc"},"schema_version":"1.0","source":{"id":"1810.06312","kind":"arxiv","version":2}},"canonical_sha256":"cb7c63912168998e18ee9386fb5d035ededad8e7554e4e0d1fb2a5f8a9fe1155","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cb7c63912168998e18ee9386fb5d035ededad8e7554e4e0d1fb2a5f8a9fe1155","first_computed_at":"2026-05-17T23:52:04.809894Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:52:04.809894Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9lKRJeKuN9senPiUN6MtLEfHdzN67Nb7A1VeOw9iiESWXj5RCh6J17gfGWGHeOnXeo1ymwjvToXXOIbmja3rAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:52:04.810325Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.06312","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:172d89e53cb22146773a3b4eb6a42b5c6558dabe96ca72c9119a176ed8a1001d","sha256:f4d8adab0a666a841146a91d00bc2b4f79432e78656c99c71ea834b83e597693"],"state_sha256":"282961274cd7002acf6c36f1aca043474b35794f00462f2cbfd0c95738f8bcbd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zgRZxnr6iKm6KMN+zJPtdjOfZ0bduX39q1CMYiaO1ZePUdOEeWAIdnMFAJIQEUY6QXCOHplyWWshEwBT6ixjBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T09:41:25.445330Z","bundle_sha256":"11db8650749931ea0366b85792fc98c21cde3c2c28450e2537e0f26f4041da7a"}}