{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:HAIANZ4YIJRLIMCHZUA4WLNT2Q","short_pith_number":"pith:HAIANZ4Y","schema_version":"1.0","canonical_sha256":"381006e7984262b43047cd01cb2db3d42ecb1fc818e3184d7644096c77ffa582","source":{"kind":"arxiv","id":"2301.07138","version":1},"attestation_state":"computed","paper":{"title":"Hydrogen Column Density Variability in a Sample of Local Compton-Thin AGN","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"A. Pizzetti, I. Cox, M. Ajello, N. Torres-Alb\\`a, R. Silver, S. Marchesi, X. Zhao","submitted_at":"2023-01-17T19:07:25Z","abstract_excerpt":"We present the analysis of multiepoch observations of a set of 12 variable, Compton-thin, local (z<0.1) active galactic nuclei (AGN) selected from the 100-month BAT catalog. We analyze all available X-ray data from \\chandra, \\xmm, and \\nustar, adding up to a total of 53 individual observations. This corresponds to between 3 and 7 observations per source, probing variability timescales between a few days and $\\sim 20$~yr. All sources have at least one \\nustar observation, ensuring high-energy coverage, which allows us to disentangle the line-of-sight and reflection components in the X-ray spect"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2301.07138","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-01-17T19:07:25Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"a967047e82d4bd0a4b9ecc0080ea9c40fe0cff79b9a5dabde72334cc78d47e53","abstract_canon_sha256":"23f3dc3725d8d5493d7dea4193dd4838d57b2e00a7640a20b1d5f1130e155d47"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:01:38.715684Z","signature_b64":"aGDhKrDnM+7h6QQh8ZPCu5b9ve5vNC5M4PSuEBasQsEDAwLp+SKgijePSq1Qj6QFrVDr73J57qPSaG/WouhAAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"381006e7984262b43047cd01cb2db3d42ecb1fc818e3184d7644096c77ffa582","last_reissued_at":"2026-07-05T07:01:38.715187Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:01:38.715187Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Hydrogen Column Density Variability in a Sample of Local Compton-Thin AGN","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"A. Pizzetti, I. Cox, M. Ajello, N. Torres-Alb\\`a, R. Silver, S. Marchesi, X. Zhao","submitted_at":"2023-01-17T19:07:25Z","abstract_excerpt":"We present the analysis of multiepoch observations of a set of 12 variable, Compton-thin, local (z<0.1) active galactic nuclei (AGN) selected from the 100-month BAT catalog. We analyze all available X-ray data from \\chandra, \\xmm, and \\nustar, adding up to a total of 53 individual observations. This corresponds to between 3 and 7 observations per source, probing variability timescales between a few days and $\\sim 20$~yr. All sources have at least one \\nustar observation, ensuring high-energy coverage, which allows us to disentangle the line-of-sight and reflection components in the X-ray spect"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2301.07138","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/2301.07138/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2301.07138","created_at":"2026-07-05T07:01:38.715246+00:00"},{"alias_kind":"arxiv_version","alias_value":"2301.07138v1","created_at":"2026-07-05T07:01:38.715246+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2301.07138","created_at":"2026-07-05T07:01:38.715246+00:00"},{"alias_kind":"pith_short_12","alias_value":"HAIANZ4YIJRL","created_at":"2026-07-05T07:01:38.715246+00:00"},{"alias_kind":"pith_short_16","alias_value":"HAIANZ4YIJRLIMCH","created_at":"2026-07-05T07:01:38.715246+00:00"},{"alias_kind":"pith_short_8","alias_value":"HAIANZ4Y","created_at":"2026-07-05T07:01:38.715246+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2607.28501","citing_title":"X-ray Absorption Variability in NGC 1142: Another Constraint on the Nature of the Torus/Broad-Line Region in Active Galactic Nuclei","ref_index":78,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q","json":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q.json","graph_json":"https://pith.science/api/pith-number/HAIANZ4YIJRLIMCHZUA4WLNT2Q/graph.json","events_json":"https://pith.science/api/pith-number/HAIANZ4YIJRLIMCHZUA4WLNT2Q/events.json","paper":"https://pith.science/paper/HAIANZ4Y"},"agent_actions":{"view_html":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q","download_json":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q.json","view_paper":"https://pith.science/paper/HAIANZ4Y","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2301.07138&json=true","fetch_graph":"https://pith.science/api/pith-number/HAIANZ4YIJRLIMCHZUA4WLNT2Q/graph.json","fetch_events":"https://pith.science/api/pith-number/HAIANZ4YIJRLIMCHZUA4WLNT2Q/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q/action/timestamp_anchor","attest_storage":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q/action/storage_attestation","attest_author":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q/action/author_attestation","sign_citation":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q/action/citation_signature","submit_replication":"https://pith.science/pith/HAIANZ4YIJRLIMCHZUA4WLNT2Q/action/replication_record"}},"created_at":"2026-07-05T07:01:38.715246+00:00","updated_at":"2026-07-05T07:01:38.715246+00:00"}