{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:YQ6KY65JD5HFTYOB4V4IRETUJK","short_pith_number":"pith:YQ6KY65J","canonical_record":{"source":{"id":"1604.03556","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-04-12T20:00:06Z","cross_cats_sorted":[],"title_canon_sha256":"f847dd6e02449a603806a37c60ddbacf94ee722c93cc30c455264b93a20ca5bc","abstract_canon_sha256":"0bbfb289f747092ec706112cc5185e386ef3c25d7121b6d7b5fb18afbe9409d7"},"schema_version":"1.0"},"canonical_sha256":"c43cac7ba91f4e59e1c1e5788892744a8f449e0344ea044e2bbed59409f1fce5","source":{"kind":"arxiv","id":"1604.03556","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.03556","created_at":"2026-05-18T01:16:12Z"},{"alias_kind":"arxiv_version","alias_value":"1604.03556v1","created_at":"2026-05-18T01:16:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.03556","created_at":"2026-05-18T01:16:12Z"},{"alias_kind":"pith_short_12","alias_value":"YQ6KY65JD5HF","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YQ6KY65JD5HFTYOB","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YQ6KY65J","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:YQ6KY65JD5HFTYOB4V4IRETUJK","target":"record","payload":{"canonical_record":{"source":{"id":"1604.03556","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-04-12T20:00:06Z","cross_cats_sorted":[],"title_canon_sha256":"f847dd6e02449a603806a37c60ddbacf94ee722c93cc30c455264b93a20ca5bc","abstract_canon_sha256":"0bbfb289f747092ec706112cc5185e386ef3c25d7121b6d7b5fb18afbe9409d7"},"schema_version":"1.0"},"canonical_sha256":"c43cac7ba91f4e59e1c1e5788892744a8f449e0344ea044e2bbed59409f1fce5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:12.850840Z","signature_b64":"iwoOE0WdieHQZFBPavFXkvL22yUO2SvCHsaTpXu/rf2GGYakr3JVLcLuYnIwaFdeJMIOjgtSf26eFCcrq1NbDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c43cac7ba91f4e59e1c1e5788892744a8f449e0344ea044e2bbed59409f1fce5","last_reissued_at":"2026-05-18T01:16:12.850108Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:12.850108Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.03556","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":"2026-05-18T01:16:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eCwRy54Odq93xLHVz4/NywzFNg/jmzAsRfepK4Bs4/On/8SYIDaqlf29zT0DDEicItFdCTkINVHMLyCqNkvsDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T09:15:49.380532Z"},"content_sha256":"4d4977c712752ec7b7ff0ae7bdf4a1934d0bc8dc524b0afe733eb96c5b087dcf","schema_version":"1.0","event_id":"sha256:4d4977c712752ec7b7ff0ae7bdf4a1934d0bc8dc524b0afe733eb96c5b087dcf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:YQ6KY65JD5HFTYOB4V4IRETUJK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Long-term X-Ray Spectral Variability in AGN from the Palomar sample observed by Swift","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"C. J. Skipper, D. Emmanoulopoulos, I.M. McHardy, S. D. Connolly","submitted_at":"2016-04-12T20:00:06Z","abstract_excerpt":"We present X-ray spectral variability of 24 local active galactic nuclei (AGN) from the Palomar sample of nearby galaxies, as observed mainly by Swift. From hardness ratio measurements, we find that 18 AGN with low accretion rates show hardening with increasing count rate, converse to the softer-when-brighter behaviour normally observed in AGN with higher accretion rates. Two AGN show softening with increasing count rate, two show more complex behaviour, and two do not show any simple relationship.\n  Sufficient data were available for the spectra of 13 AGN to be summed in flux-bins. In 9 of th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.03556","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":"2026-05-18T01:16:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V5WzaxJdrSDp0DdjS24afIxnBDZXosXbvg3283cULjjw0jgJsKHMdiq//hopH4enR+gwKXAWjk+gMdmICujfAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T09:15:49.380881Z"},"content_sha256":"9f72729ee0e1a80dbeccbd97ba1ab04a3e9f30c5ca3550e72d7b4a5c067fdae6","schema_version":"1.0","event_id":"sha256:9f72729ee0e1a80dbeccbd97ba1ab04a3e9f30c5ca3550e72d7b4a5c067fdae6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YQ6KY65JD5HFTYOB4V4IRETUJK/bundle.json","state_url":"https://pith.science/pith/YQ6KY65JD5HFTYOB4V4IRETUJK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YQ6KY65JD5HFTYOB4V4IRETUJK/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":"2026-06-20T09:15:49Z","links":{"resolver":"https://pith.science/pith/YQ6KY65JD5HFTYOB4V4IRETUJK","bundle":"https://pith.science/pith/YQ6KY65JD5HFTYOB4V4IRETUJK/bundle.json","state":"https://pith.science/pith/YQ6KY65JD5HFTYOB4V4IRETUJK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YQ6KY65JD5HFTYOB4V4IRETUJK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:YQ6KY65JD5HFTYOB4V4IRETUJK","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":"0bbfb289f747092ec706112cc5185e386ef3c25d7121b6d7b5fb18afbe9409d7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-04-12T20:00:06Z","title_canon_sha256":"f847dd6e02449a603806a37c60ddbacf94ee722c93cc30c455264b93a20ca5bc"},"schema_version":"1.0","source":{"id":"1604.03556","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.03556","created_at":"2026-05-18T01:16:12Z"},{"alias_kind":"arxiv_version","alias_value":"1604.03556v1","created_at":"2026-05-18T01:16:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.03556","created_at":"2026-05-18T01:16:12Z"},{"alias_kind":"pith_short_12","alias_value":"YQ6KY65JD5HF","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YQ6KY65JD5HFTYOB","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YQ6KY65J","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:9f72729ee0e1a80dbeccbd97ba1ab04a3e9f30c5ca3550e72d7b4a5c067fdae6","target":"graph","created_at":"2026-05-18T01:16:12Z","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":"We present X-ray spectral variability of 24 local active galactic nuclei (AGN) from the Palomar sample of nearby galaxies, as observed mainly by Swift. From hardness ratio measurements, we find that 18 AGN with low accretion rates show hardening with increasing count rate, converse to the softer-when-brighter behaviour normally observed in AGN with higher accretion rates. Two AGN show softening with increasing count rate, two show more complex behaviour, and two do not show any simple relationship.\n  Sufficient data were available for the spectra of 13 AGN to be summed in flux-bins. In 9 of th","authors_text":"C. J. Skipper, D. Emmanoulopoulos, I.M. McHardy, S. D. Connolly","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-04-12T20:00:06Z","title":"Long-term X-Ray Spectral Variability in AGN from the Palomar sample observed by Swift"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.03556","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":"sha256:4d4977c712752ec7b7ff0ae7bdf4a1934d0bc8dc524b0afe733eb96c5b087dcf","target":"record","created_at":"2026-05-18T01:16:12Z","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":"0bbfb289f747092ec706112cc5185e386ef3c25d7121b6d7b5fb18afbe9409d7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-04-12T20:00:06Z","title_canon_sha256":"f847dd6e02449a603806a37c60ddbacf94ee722c93cc30c455264b93a20ca5bc"},"schema_version":"1.0","source":{"id":"1604.03556","kind":"arxiv","version":1}},"canonical_sha256":"c43cac7ba91f4e59e1c1e5788892744a8f449e0344ea044e2bbed59409f1fce5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c43cac7ba91f4e59e1c1e5788892744a8f449e0344ea044e2bbed59409f1fce5","first_computed_at":"2026-05-18T01:16:12.850108Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:12.850108Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iwoOE0WdieHQZFBPavFXkvL22yUO2SvCHsaTpXu/rf2GGYakr3JVLcLuYnIwaFdeJMIOjgtSf26eFCcrq1NbDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:12.850840Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.03556","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4d4977c712752ec7b7ff0ae7bdf4a1934d0bc8dc524b0afe733eb96c5b087dcf","sha256:9f72729ee0e1a80dbeccbd97ba1ab04a3e9f30c5ca3550e72d7b4a5c067fdae6"],"state_sha256":"5220ae3aa50fab30369ec20218120a7c693319aa30b6003c921ffb7c3d530faa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Z1g+Hbjokw72vPBrqsXuGch+YwGJFb67I5xRGk2At8PtCYFNwXC6wpOPa8YXWbynfuPE28EctjBZ9ggPD6RxAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T09:15:49.382777Z","bundle_sha256":"a1f4531620b48544801b85b7be06ddb1b3acd61eebdfd9cce46f53f3cc4f2f30"}}