{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:MGJSXR7XEIFMQ75LHEOKCX3CUN","short_pith_number":"pith:MGJSXR7X","schema_version":"1.0","canonical_sha256":"61932bc7f7220ac87fab391ca15f62a34c2467faa9c7d6fbc48156e347c97603","source":{"kind":"arxiv","id":"1110.5341","version":1},"attestation_state":"computed","paper":{"title":"The X-Ray Variability of a Large, Serendipitous Sample of Spectroscopic Quasars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Robert R. Gibson, W. N. Brandt","submitted_at":"2011-10-24T20:13:31Z","abstract_excerpt":"We analyze the X-ray variability of 264 Sloan Digital Sky Survey spectroscopic quasars using the Chandra public archive. This data set consists of quasars with spectroscopic redshifts out to z~5 and covers rest-frame time scales up to Delta t_sys 2000 d, with 3 or more X-ray observations available for 82 quasars. It therefore samples longer time scales and higher luminosities than previous large-scale analyses of AGN variablity. We find significant (>3 sigma) variation in ~30% of the quasars overall; the fraction of sources with detected variability increases strongly with the number of availa"},"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":"1110.5341","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-10-24T20:13:31Z","cross_cats_sorted":[],"title_canon_sha256":"076b6a7881442fa83daafb6f63828a3d82ad5593d6a190412806a8a1848b50b7","abstract_canon_sha256":"c6d44f25708591da6c4075036c88f5a57f27b7d2687d13acfb2c79faecf61fed"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:04.439641Z","signature_b64":"DR2qeNlY6tFtVYLB3lHNxImb501z8iV2ICiseF6YmRcXQL54JTPr8Lyw0MaSMTKEQwprppFOTQqqMAARkTWdAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"61932bc7f7220ac87fab391ca15f62a34c2467faa9c7d6fbc48156e347c97603","last_reissued_at":"2026-05-18T02:00:04.439024Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:04.439024Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The X-Ray Variability of a Large, Serendipitous Sample of Spectroscopic Quasars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Robert R. Gibson, W. N. Brandt","submitted_at":"2011-10-24T20:13:31Z","abstract_excerpt":"We analyze the X-ray variability of 264 Sloan Digital Sky Survey spectroscopic quasars using the Chandra public archive. This data set consists of quasars with spectroscopic redshifts out to z~5 and covers rest-frame time scales up to Delta t_sys 2000 d, with 3 or more X-ray observations available for 82 quasars. It therefore samples longer time scales and higher luminosities than previous large-scale analyses of AGN variablity. We find significant (>3 sigma) variation in ~30% of the quasars overall; the fraction of sources with detected variability increases strongly with the number of availa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1110.5341","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1110.5341","created_at":"2026-05-18T02:00:04.439114+00:00"},{"alias_kind":"arxiv_version","alias_value":"1110.5341v1","created_at":"2026-05-18T02:00:04.439114+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1110.5341","created_at":"2026-05-18T02:00:04.439114+00:00"},{"alias_kind":"pith_short_12","alias_value":"MGJSXR7XEIFM","created_at":"2026-05-18T12:26:34.985390+00:00"},{"alias_kind":"pith_short_16","alias_value":"MGJSXR7XEIFMQ75L","created_at":"2026-05-18T12:26:34.985390+00:00"},{"alias_kind":"pith_short_8","alias_value":"MGJSXR7X","created_at":"2026-05-18T12:26:34.985390+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2605.22918","citing_title":"Strong X-ray Variability of I Zwicky 1: Obscuration from Clumpy Accretion-Disk Winds","ref_index":24,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN","json":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN.json","graph_json":"https://pith.science/api/pith-number/MGJSXR7XEIFMQ75LHEOKCX3CUN/graph.json","events_json":"https://pith.science/api/pith-number/MGJSXR7XEIFMQ75LHEOKCX3CUN/events.json","paper":"https://pith.science/paper/MGJSXR7X"},"agent_actions":{"view_html":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN","download_json":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN.json","view_paper":"https://pith.science/paper/MGJSXR7X","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1110.5341&json=true","fetch_graph":"https://pith.science/api/pith-number/MGJSXR7XEIFMQ75LHEOKCX3CUN/graph.json","fetch_events":"https://pith.science/api/pith-number/MGJSXR7XEIFMQ75LHEOKCX3CUN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN/action/storage_attestation","attest_author":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN/action/author_attestation","sign_citation":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN/action/citation_signature","submit_replication":"https://pith.science/pith/MGJSXR7XEIFMQ75LHEOKCX3CUN/action/replication_record"}},"created_at":"2026-05-18T02:00:04.439114+00:00","updated_at":"2026-05-18T02:00:04.439114+00:00"}