{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2004:3B2JQGA5Y2CGCFL3LJNUUHJUJW","short_pith_number":"pith:3B2JQGA5","schema_version":"1.0","canonical_sha256":"d87498181dc68461157b5a5b4a1d344db6bfc2561f8f6e7338fc817d9f33c374","source":{"kind":"arxiv","id":"astro-ph/0406481","version":1},"attestation_state":"computed","paper":{"title":"Observing Mkn 421 with XMM--Newton: the EPIC--PN point of view","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"F. Tavecchio, G. Ghisellini, G. Tagliaferri, M. Ravasio","submitted_at":"2004-06-22T13:34:41Z","abstract_excerpt":"We present three observations (four exposures) of Mkn 421 performed by XMM--Newton in the Autumn of 2002, concentrating on the EPIC--PN camera data. The X-ray spectra were soft and steepening toward high energies. The source was highly variable and the hardness ratio plots displayed a clear harder--when--stronger correlation. During two complete flares the source showed strong spectral evolution: a hardness ratio and a time resolved spectral analysis revealed both a clockwise and a counterclockwise rotating loop patterns, suggesting the presence of temporal lags between different energy bands "},"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/0406481","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-06-22T13:34:41Z","cross_cats_sorted":[],"title_canon_sha256":"d5d4d8ce096031e5b0d0b04e292816547ba98f9273b0ea3021203d8f7c05943c","abstract_canon_sha256":"4ff8b08c2560fbadb5a63f9790636658b890a680cf4b4b9b3865fdbee4c86795"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:44:03.645652Z","signature_b64":"opgeXOGzJrye40ca95ma3hgphjGltaibu7cwKm7BW19TcOgiRSTKZ43OcPMSr6qjKsfmGqe43TCPam/9OYHeDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d87498181dc68461157b5a5b4a1d344db6bfc2561f8f6e7338fc817d9f33c374","last_reissued_at":"2026-07-04T16:44:03.645243Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:44:03.645243Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observing Mkn 421 with XMM--Newton: the EPIC--PN point of view","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"F. Tavecchio, G. Ghisellini, G. Tagliaferri, M. Ravasio","submitted_at":"2004-06-22T13:34:41Z","abstract_excerpt":"We present three observations (four exposures) of Mkn 421 performed by XMM--Newton in the Autumn of 2002, concentrating on the EPIC--PN camera data. The X-ray spectra were soft and steepening toward high energies. The source was highly variable and the hardness ratio plots displayed a clear harder--when--stronger correlation. During two complete flares the source showed strong spectral evolution: a hardness ratio and a time resolved spectral analysis revealed both a clockwise and a counterclockwise rotating loop patterns, suggesting the presence of temporal lags between different energy bands "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0406481","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/astro-ph/0406481/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":"astro-ph/0406481","created_at":"2026-07-04T16:44:03.645297+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0406481v1","created_at":"2026-07-04T16:44:03.645297+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0406481","created_at":"2026-07-04T16:44:03.645297+00:00"},{"alias_kind":"pith_short_12","alias_value":"3B2JQGA5Y2CG","created_at":"2026-07-04T16:44:03.645297+00:00"},{"alias_kind":"pith_short_16","alias_value":"3B2JQGA5Y2CGCFL3","created_at":"2026-07-04T16:44:03.645297+00:00"},{"alias_kind":"pith_short_8","alias_value":"3B2JQGA5","created_at":"2026-07-04T16:44:03.645297+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/3B2JQGA5Y2CGCFL3LJNUUHJUJW","json":"https://pith.science/pith/3B2JQGA5Y2CGCFL3LJNUUHJUJW.json","graph_json":"https://pith.science/api/pith-number/3B2JQGA5Y2CGCFL3LJNUUHJUJW/graph.json","events_json":"https://pith.science/api/pith-number/3B2JQGA5Y2CGCFL3LJNUUHJUJW/events.json","paper":"https://pith.science/paper/3B2JQGA5"},"agent_actions":{"view_html":"https://pith.science/pith/3B2JQGA5Y2CGCFL3LJNUUHJUJW","download_json":"https://pith.science/pith/3B2JQGA5Y2CGCFL3LJNUUHJUJW.json","view_paper":"https://pith.science/paper/3B2JQGA5","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0406481&json=true","fetch_graph":"https://pith.science/api/pith-number/3B2JQGA5Y2CGCFL3LJNUUHJUJW/graph.json","fetch_events":"https://pith.science/api/pith-number/3B2JQGA5Y2CGCFL3LJNUUHJUJW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/3B2JQGA5Y2CGCFL3LJNUUHJUJW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/3B2JQGA5Y2CGCFL3LJNUUHJUJW/action/storage_attestation","attest_author":"https://pith.science/pith/3B2JQGA5Y2CGCFL3LJNUUHJUJW/action/author_attestation","sign_citation":"https://pith.science/pith/3B2JQGA5Y2CGCFL3LJNUUHJUJW/action/citation_signature","submit_replication":"https://pith.science/pith/3B2JQGA5Y2CGCFL3LJNUUHJUJW/action/replication_record"}},"created_at":"2026-07-04T16:44:03.645297+00:00","updated_at":"2026-07-04T16:44:03.645297+00:00"}