{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:RQM7HIHYBNOGG4SO6WPDEECNCF","short_pith_number":"pith:RQM7HIHY","canonical_record":{"source":{"id":"0802.2936","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-20T20:47:09Z","cross_cats_sorted":[],"title_canon_sha256":"8d0759afc478c85768f4b4b878cfd73b0956dfe87ff209b1f1733559c0e58992","abstract_canon_sha256":"4bd76722397819ee59fb4f49d2b1b059d981cfd3c679b003c9388c93c95d4be3"},"schema_version":"1.0"},"canonical_sha256":"8c19f3a0f80b5c63724ef59e32104d116f4584ce439dcba5b7e9e9adc6dc854f","source":{"kind":"arxiv","id":"0802.2936","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0802.2936","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"arxiv_version","alias_value":"0802.2936v1","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0802.2936","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"pith_short_12","alias_value":"RQM7HIHYBNOG","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"pith_short_16","alias_value":"RQM7HIHYBNOGG4SO","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"pith_short_8","alias_value":"RQM7HIHY","created_at":"2026-07-04T17:09:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:RQM7HIHYBNOGG4SO6WPDEECNCF","target":"record","payload":{"canonical_record":{"source":{"id":"0802.2936","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-20T20:47:09Z","cross_cats_sorted":[],"title_canon_sha256":"8d0759afc478c85768f4b4b878cfd73b0956dfe87ff209b1f1733559c0e58992","abstract_canon_sha256":"4bd76722397819ee59fb4f49d2b1b059d981cfd3c679b003c9388c93c95d4be3"},"schema_version":"1.0"},"canonical_sha256":"8c19f3a0f80b5c63724ef59e32104d116f4584ce439dcba5b7e9e9adc6dc854f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:09:24.737084Z","signature_b64":"LoEDgk8oTD87/RbWeaApt7EE8ksDjCBgCUhsToM3SBBsSP0WRat2Ry6EidGoWsJXD4hK5KQhm9eYlU6l9uS6Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8c19f3a0f80b5c63724ef59e32104d116f4584ce439dcba5b7e9e9adc6dc854f","last_reissued_at":"2026-07-04T17:09:24.736549Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:09:24.736549Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0802.2936","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":"2026-07-04T17:09:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oxHvSl29BUiVGh02Q6ZR6RtVl952M6EEHgd7FGy23CwyhbmzITp3kJVxhFTxeLz0CyVXb33KX1IWr5GpqMTIBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T19:08:26.192838Z"},"content_sha256":"eb062c2ba86f5b8a44d34e793937d2f1a5e97a433035c03404f0eccca6df1b57","schema_version":"1.0","event_id":"sha256:eb062c2ba86f5b8a44d34e793937d2f1a5e97a433035c03404f0eccca6df1b57"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:RQM7HIHYBNOGG4SO6WPDEECNCF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"X-ray spectral variability in PG1535+547: the changing-look of a 'soft X-ray weak' AGN","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"3), 6) ((1) ESAC-ESA, Bologna, C. Vignali (2, E. Jimenez-Bailon (4), E. Piconcelli (5), Italy), Italy; (3) IASF-INAF, Italy; (4) IA-UNAM, Italy; (6) Obs. Bologna, L. Ballo (1), Madrid, M. Cappi (3), Mexico; (5) Obs. Roma, M. Giustini (2, M. Santos-Lleo (1), N. Schartel (1), Spain; (2) Bologna University","submitted_at":"2008-02-20T20:47:09Z","abstract_excerpt":"PG1535+547 is a bright NLS1 galaxy, whose high energy emission shows strong variability in shape and flux. ROSAT data classified it as soft X-ray weak QSO (objects whose X-ray-to-optical flux ratio is smaller than in typical QSO): their X-ray spectra are often characterized by highly ionized, complex absorbers and/or reflection from the disk, whose relative importance is currently debated. In both cases, the presence of such features implies that we are looking at matter located in the innermost regions of the AGN. In this paper we want to clarify the nature of the X-ray emission of PG1535+547"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0802.2936","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/0802.2936/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":"2026-07-04T17:09:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J9OyU64f/bQWLGUFWMI1UcFzpoyl5ZfpUaXfs53i8WpWGUb8umfMyZQMQ3tjpVL6WkA0CXB2yhIYTnG7GApKDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T19:08:26.193407Z"},"content_sha256":"e1fb58651c1f9c8002ca011eca97553a521a084eda38dded0ac0367c2d2488fc","schema_version":"1.0","event_id":"sha256:e1fb58651c1f9c8002ca011eca97553a521a084eda38dded0ac0367c2d2488fc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RQM7HIHYBNOGG4SO6WPDEECNCF/bundle.json","state_url":"https://pith.science/pith/RQM7HIHYBNOGG4SO6WPDEECNCF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RQM7HIHYBNOGG4SO6WPDEECNCF/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":"2026-08-04T19:08:26Z","links":{"resolver":"https://pith.science/pith/RQM7HIHYBNOGG4SO6WPDEECNCF","bundle":"https://pith.science/pith/RQM7HIHYBNOGG4SO6WPDEECNCF/bundle.json","state":"https://pith.science/pith/RQM7HIHYBNOGG4SO6WPDEECNCF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RQM7HIHYBNOGG4SO6WPDEECNCF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:RQM7HIHYBNOGG4SO6WPDEECNCF","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":"4bd76722397819ee59fb4f49d2b1b059d981cfd3c679b003c9388c93c95d4be3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-20T20:47:09Z","title_canon_sha256":"8d0759afc478c85768f4b4b878cfd73b0956dfe87ff209b1f1733559c0e58992"},"schema_version":"1.0","source":{"id":"0802.2936","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0802.2936","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"arxiv_version","alias_value":"0802.2936v1","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0802.2936","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"pith_short_12","alias_value":"RQM7HIHYBNOG","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"pith_short_16","alias_value":"RQM7HIHYBNOGG4SO","created_at":"2026-07-04T17:09:24Z"},{"alias_kind":"pith_short_8","alias_value":"RQM7HIHY","created_at":"2026-07-04T17:09:24Z"}],"graph_snapshots":[{"event_id":"sha256:e1fb58651c1f9c8002ca011eca97553a521a084eda38dded0ac0367c2d2488fc","target":"graph","created_at":"2026-07-04T17:09:24Z","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/0802.2936/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"PG1535+547 is a bright NLS1 galaxy, whose high energy emission shows strong variability in shape and flux. ROSAT data classified it as soft X-ray weak QSO (objects whose X-ray-to-optical flux ratio is smaller than in typical QSO): their X-ray spectra are often characterized by highly ionized, complex absorbers and/or reflection from the disk, whose relative importance is currently debated. In both cases, the presence of such features implies that we are looking at matter located in the innermost regions of the AGN. In this paper we want to clarify the nature of the X-ray emission of PG1535+547","authors_text":"3), 6) ((1) ESAC-ESA, Bologna, C. Vignali (2, E. Jimenez-Bailon (4), E. Piconcelli (5), Italy), Italy; (3) IASF-INAF, Italy; (4) IA-UNAM, Italy; (6) Obs. Bologna, L. Ballo (1), Madrid, M. Cappi (3), Mexico; (5) Obs. Roma, M. Giustini (2, M. Santos-Lleo (1), N. Schartel (1), Spain; (2) Bologna University","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-20T20:47:09Z","title":"X-ray spectral variability in PG1535+547: the changing-look of a 'soft X-ray weak' AGN"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0802.2936","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:eb062c2ba86f5b8a44d34e793937d2f1a5e97a433035c03404f0eccca6df1b57","target":"record","created_at":"2026-07-04T17:09:24Z","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":"4bd76722397819ee59fb4f49d2b1b059d981cfd3c679b003c9388c93c95d4be3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-02-20T20:47:09Z","title_canon_sha256":"8d0759afc478c85768f4b4b878cfd73b0956dfe87ff209b1f1733559c0e58992"},"schema_version":"1.0","source":{"id":"0802.2936","kind":"arxiv","version":1}},"canonical_sha256":"8c19f3a0f80b5c63724ef59e32104d116f4584ce439dcba5b7e9e9adc6dc854f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8c19f3a0f80b5c63724ef59e32104d116f4584ce439dcba5b7e9e9adc6dc854f","first_computed_at":"2026-07-04T17:09:24.736549Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:09:24.736549Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LoEDgk8oTD87/RbWeaApt7EE8ksDjCBgCUhsToM3SBBsSP0WRat2Ry6EidGoWsJXD4hK5KQhm9eYlU6l9uS6Aw==","signature_status":"signed_v1","signed_at":"2026-07-04T17:09:24.737084Z","signed_message":"canonical_sha256_bytes"},"source_id":"0802.2936","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eb062c2ba86f5b8a44d34e793937d2f1a5e97a433035c03404f0eccca6df1b57","sha256:e1fb58651c1f9c8002ca011eca97553a521a084eda38dded0ac0367c2d2488fc"],"state_sha256":"0bb6bcba48a0224b875670ae65436a05c868fd427249885c8664c399cdb7bd5a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FLquTcOooVEIg+SHL2sbBF+zOPpAOLUnUCZz+z1CqelbzavABY3AcOyMl2TOH3xgrVGOx/hqzyZMy5s4gXqGAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T19:08:26.197442Z","bundle_sha256":"b86b7ca2ff3606403cb33cae7ee914e4e8eaa84e20b73a82eeb63ec20f075c12"}}