{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:4LGRRU5H66XDX4JZQVA3QXOYXH","short_pith_number":"pith:4LGRRU5H","canonical_record":{"source":{"id":"2204.06813","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-04-14T08:20:43Z","cross_cats_sorted":[],"title_canon_sha256":"9295869c8d8368b2b5ee0df5a8f9cc0e4041554793839e7ee6591df4db23510f","abstract_canon_sha256":"0975d78ac9db5c3cd38de5c9bab85ce671428108d551380bc4302bb3be836c8e"},"schema_version":"1.0"},"canonical_sha256":"e2cd18d3a7f7ae3bf1398541b85dd8b9c4bf814de5d30b2ac437c6646bcf96e0","source":{"kind":"arxiv","id":"2204.06813","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.06813","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"arxiv_version","alias_value":"2204.06813v1","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.06813","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"pith_short_12","alias_value":"4LGRRU5H66XD","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"pith_short_16","alias_value":"4LGRRU5H66XDX4JZ","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"pith_short_8","alias_value":"4LGRRU5H","created_at":"2026-07-05T04:57:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:4LGRRU5H66XDX4JZQVA3QXOYXH","target":"record","payload":{"canonical_record":{"source":{"id":"2204.06813","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-04-14T08:20:43Z","cross_cats_sorted":[],"title_canon_sha256":"9295869c8d8368b2b5ee0df5a8f9cc0e4041554793839e7ee6591df4db23510f","abstract_canon_sha256":"0975d78ac9db5c3cd38de5c9bab85ce671428108d551380bc4302bb3be836c8e"},"schema_version":"1.0"},"canonical_sha256":"e2cd18d3a7f7ae3bf1398541b85dd8b9c4bf814de5d30b2ac437c6646bcf96e0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:57:07.476630Z","signature_b64":"WWjMAQGYtZBo3HTbfoBg/3ksljcmc0AnNcKJLYDQ0BxiOnxhUz8Xe49lDxtiO2DdOJ8XFscRT3xpJsEyU0JPCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e2cd18d3a7f7ae3bf1398541b85dd8b9c4bf814de5d30b2ac437c6646bcf96e0","last_reissued_at":"2026-07-05T04:57:07.476247Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:57:07.476247Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2204.06813","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":"2026-07-05T04:57:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1qbTe6BLMMy0yI5tUy1Py4pucAgZ02QtBuxTGOzU92YLWEEQUFhRzjB7URRwe80v9kfySWFRKc/pPwEFoUcAAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T07:54:51.713516Z"},"content_sha256":"bf155c7f109b0dd73f86b267143145f1e829d506403b20e74873b7fb1fe8dbe4","schema_version":"1.0","event_id":"sha256:bf155c7f109b0dd73f86b267143145f1e829d506403b20e74873b7fb1fe8dbe4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:4LGRRU5H66XDX4JZQVA3QXOYXH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Transient obscuration event captured in NGC 3227 III. Photoionization modeling of the X-ray obscuration event in 2019","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"B. De Marco, C. Pinto, D. J. Walton, E. Behar, E. Costantini, G. A. Kriss, G. Branduardi-Raymont, G. Ponti, H. Landt, J. Ebrero, J. S. Kaastra, Junjie Mao, L. Di Gesu, M. Mehdipour, P.-O. Petrucci, S. Bianchi, S. Grafton-Waters, Yasushi Fukazawa, Yijun Wang","submitted_at":"2022-04-14T08:20:43Z","abstract_excerpt":"A growing number of transient X-ray obscuration events in type I AGN suggest that our line-of-sight to the central engine is not always free. Multiple X-ray obscuration events have been reported in the nearby Seyfert 1.5 galaxy NGC 3227 from 2000 to 2016. In late 2019, another X-ray obscuration event was identified with Swift. Two coordinated target-of-opportunity observations with XMM-Newton, NuSTAR, and HST/COS were triggered in Nov. and Dec. 2019 to study this obscuration event. For each observation, we analyze the time-averaged X-ray spectra. We perform photoionization modeling with the SP"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.06813","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/2204.06813/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":"2026-07-05T04:57:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N7mFOJKWKTQGkpSxTa8I4RqoZe8u/3Jt5OEpAo2frf7JppqffSLNr10YaNDLSYYMLfKvdKP5TspnJCsI6TFpCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T07:54:51.714095Z"},"content_sha256":"045c89ddf262ca4be33d0a8eda6bd7321e294277db8b2f76bd9f958ea3a4dc28","schema_version":"1.0","event_id":"sha256:045c89ddf262ca4be33d0a8eda6bd7321e294277db8b2f76bd9f958ea3a4dc28"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4LGRRU5H66XDX4JZQVA3QXOYXH/bundle.json","state_url":"https://pith.science/pith/4LGRRU5H66XDX4JZQVA3QXOYXH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4LGRRU5H66XDX4JZQVA3QXOYXH/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":"2026-08-06T07:54:51Z","links":{"resolver":"https://pith.science/pith/4LGRRU5H66XDX4JZQVA3QXOYXH","bundle":"https://pith.science/pith/4LGRRU5H66XDX4JZQVA3QXOYXH/bundle.json","state":"https://pith.science/pith/4LGRRU5H66XDX4JZQVA3QXOYXH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4LGRRU5H66XDX4JZQVA3QXOYXH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:4LGRRU5H66XDX4JZQVA3QXOYXH","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":"0975d78ac9db5c3cd38de5c9bab85ce671428108d551380bc4302bb3be836c8e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-04-14T08:20:43Z","title_canon_sha256":"9295869c8d8368b2b5ee0df5a8f9cc0e4041554793839e7ee6591df4db23510f"},"schema_version":"1.0","source":{"id":"2204.06813","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.06813","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"arxiv_version","alias_value":"2204.06813v1","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.06813","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"pith_short_12","alias_value":"4LGRRU5H66XD","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"pith_short_16","alias_value":"4LGRRU5H66XDX4JZ","created_at":"2026-07-05T04:57:07Z"},{"alias_kind":"pith_short_8","alias_value":"4LGRRU5H","created_at":"2026-07-05T04:57:07Z"}],"graph_snapshots":[{"event_id":"sha256:045c89ddf262ca4be33d0a8eda6bd7321e294277db8b2f76bd9f958ea3a4dc28","target":"graph","created_at":"2026-07-05T04:57:07Z","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/2204.06813/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A growing number of transient X-ray obscuration events in type I AGN suggest that our line-of-sight to the central engine is not always free. Multiple X-ray obscuration events have been reported in the nearby Seyfert 1.5 galaxy NGC 3227 from 2000 to 2016. In late 2019, another X-ray obscuration event was identified with Swift. Two coordinated target-of-opportunity observations with XMM-Newton, NuSTAR, and HST/COS were triggered in Nov. and Dec. 2019 to study this obscuration event. For each observation, we analyze the time-averaged X-ray spectra. We perform photoionization modeling with the SP","authors_text":"B. De Marco, C. Pinto, D. J. Walton, E. Behar, E. Costantini, G. A. Kriss, G. Branduardi-Raymont, G. Ponti, H. Landt, J. Ebrero, J. S. Kaastra, Junjie Mao, L. Di Gesu, M. Mehdipour, P.-O. Petrucci, S. Bianchi, S. Grafton-Waters, Yasushi Fukazawa, Yijun Wang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-04-14T08:20:43Z","title":"Transient obscuration event captured in NGC 3227 III. Photoionization modeling of the X-ray obscuration event in 2019"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.06813","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:bf155c7f109b0dd73f86b267143145f1e829d506403b20e74873b7fb1fe8dbe4","target":"record","created_at":"2026-07-05T04:57:07Z","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":"0975d78ac9db5c3cd38de5c9bab85ce671428108d551380bc4302bb3be836c8e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-04-14T08:20:43Z","title_canon_sha256":"9295869c8d8368b2b5ee0df5a8f9cc0e4041554793839e7ee6591df4db23510f"},"schema_version":"1.0","source":{"id":"2204.06813","kind":"arxiv","version":1}},"canonical_sha256":"e2cd18d3a7f7ae3bf1398541b85dd8b9c4bf814de5d30b2ac437c6646bcf96e0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e2cd18d3a7f7ae3bf1398541b85dd8b9c4bf814de5d30b2ac437c6646bcf96e0","first_computed_at":"2026-07-05T04:57:07.476247Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:57:07.476247Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WWjMAQGYtZBo3HTbfoBg/3ksljcmc0AnNcKJLYDQ0BxiOnxhUz8Xe49lDxtiO2DdOJ8XFscRT3xpJsEyU0JPCA==","signature_status":"signed_v1","signed_at":"2026-07-05T04:57:07.476630Z","signed_message":"canonical_sha256_bytes"},"source_id":"2204.06813","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bf155c7f109b0dd73f86b267143145f1e829d506403b20e74873b7fb1fe8dbe4","sha256:045c89ddf262ca4be33d0a8eda6bd7321e294277db8b2f76bd9f958ea3a4dc28"],"state_sha256":"7c4b7740d43fc4229e3d293929881ef459dce8ebbd2c93185e6d5a483e0ce417"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M3yzUklkeM4IgxWuOFB+KbZo0+4eNMBtBS/lm3hpVoRa/3sgUr054p6TwppikKsJhs6o+PliHdhqZhdrTkrJCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T07:54:51.717593Z","bundle_sha256":"97a36d897d199c1d62b98bffd682bd33f2030e27b05a45e514bc7ab98cda2713"}}