{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1998:ARBC472VSRTEJ6J6Z4FGSE7KGG","short_pith_number":"pith:ARBC472V","schema_version":"1.0","canonical_sha256":"04422e7f55946644f93ecf0a6913ea31af8799c3423ec9d4acabc1ff4b84cd1f","source":{"kind":"arxiv","id":"astro-ph/9809308","version":1},"attestation_state":"computed","paper":{"title":"Constraints on a soft X-ray excess in the quasar 3C 279","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. J. Lawson, I.M. McHardy","submitted_at":"1998-09-24T14:28:33Z","abstract_excerpt":"We present the results of a three-week daily monitoring campaign on the quasar 3C 279 by the X-ray satellites RXTE and ROSAT. A cross correlation provides no evidence for any time lag between the very similar soft and hard X-ray light curves, and the source shows no significant spectral variability over the observing period. There is no evidence to support the presence of a soft excess, with a 99 per cent upper limit on any such component of 25 per cent of the total observed luminosity in the 0.1-2 keV band (< 3 x 10^38 W). This fraction (but not the luminosity) is significantly less than that"},"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":"astro-ph/9809308","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1998-09-24T14:28:33Z","cross_cats_sorted":[],"title_canon_sha256":"545e7acb09f6c96b0f5294b4c4a00242284b61cb2477b2ebfdb1bd3c06a1c28e","abstract_canon_sha256":"d5367f1ed2c795f46edd00b2c14f034a52089532cf7016dfb65571b86fa1d4dd"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:13.692788Z","signature_b64":"mabUf/kNX9K4fLqR5VQcWMp4qJGOvGrrzppGLGt2QAjExtDUbjDvuMqTceojCre0V5IRQbRVpal4GKICFNZ/Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"04422e7f55946644f93ecf0a6913ea31af8799c3423ec9d4acabc1ff4b84cd1f","last_reissued_at":"2026-05-18T01:40:13.692065Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:13.692065Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Constraints on a soft X-ray excess in the quasar 3C 279","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. J. Lawson, I.M. McHardy","submitted_at":"1998-09-24T14:28:33Z","abstract_excerpt":"We present the results of a three-week daily monitoring campaign on the quasar 3C 279 by the X-ray satellites RXTE and ROSAT. A cross correlation provides no evidence for any time lag between the very similar soft and hard X-ray light curves, and the source shows no significant spectral variability over the observing period. There is no evidence to support the presence of a soft excess, with a 99 per cent upper limit on any such component of 25 per cent of the total observed luminosity in the 0.1-2 keV band (< 3 x 10^38 W). This fraction (but not the luminosity) is significantly less than that"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9809308","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":"astro-ph/9809308","created_at":"2026-05-18T01:40:13.692198+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9809308v1","created_at":"2026-05-18T01:40:13.692198+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9809308","created_at":"2026-05-18T01:40:13.692198+00:00"},{"alias_kind":"pith_short_12","alias_value":"ARBC472VSRTE","created_at":"2026-05-18T12:25:49.038998+00:00"},{"alias_kind":"pith_short_16","alias_value":"ARBC472VSRTEJ6J6","created_at":"2026-05-18T12:25:49.038998+00:00"},{"alias_kind":"pith_short_8","alias_value":"ARBC472V","created_at":"2026-05-18T12:25:49.038998+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG","json":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG.json","graph_json":"https://pith.science/api/pith-number/ARBC472VSRTEJ6J6Z4FGSE7KGG/graph.json","events_json":"https://pith.science/api/pith-number/ARBC472VSRTEJ6J6Z4FGSE7KGG/events.json","paper":"https://pith.science/paper/ARBC472V"},"agent_actions":{"view_html":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG","download_json":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG.json","view_paper":"https://pith.science/paper/ARBC472V","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/9809308&json=true","fetch_graph":"https://pith.science/api/pith-number/ARBC472VSRTEJ6J6Z4FGSE7KGG/graph.json","fetch_events":"https://pith.science/api/pith-number/ARBC472VSRTEJ6J6Z4FGSE7KGG/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG/action/timestamp_anchor","attest_storage":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG/action/storage_attestation","attest_author":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG/action/author_attestation","sign_citation":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG/action/citation_signature","submit_replication":"https://pith.science/pith/ARBC472VSRTEJ6J6Z4FGSE7KGG/action/replication_record"}},"created_at":"2026-05-18T01:40:13.692198+00:00","updated_at":"2026-05-18T01:40:13.692198+00:00"}