{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:CTOQMFI3QD6CR22NLA4LIJQ6R2","short_pith_number":"pith:CTOQMFI3","canonical_record":{"source":{"id":"2309.05705","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-09-11T18:00:02Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"572db8af1131fbbd016398bd788faf4c4f374442b501fb97fc3e564aba4dd59e","abstract_canon_sha256":"c7ac7dca516281326a600a8b10c89c38d2aa3711068887794922f6d7662a6457"},"schema_version":"1.0"},"canonical_sha256":"14dd06151b80fc28eb4d5838b4261e8e8cdd799f2c892a02ae60420d24ba1095","source":{"kind":"arxiv","id":"2309.05705","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.05705","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"arxiv_version","alias_value":"2309.05705v1","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.05705","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"pith_short_12","alias_value":"CTOQMFI3QD6C","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"pith_short_16","alias_value":"CTOQMFI3QD6CR22N","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"pith_short_8","alias_value":"CTOQMFI3","created_at":"2026-07-05T06:49:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:CTOQMFI3QD6CR22NLA4LIJQ6R2","target":"record","payload":{"canonical_record":{"source":{"id":"2309.05705","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-09-11T18:00:02Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"572db8af1131fbbd016398bd788faf4c4f374442b501fb97fc3e564aba4dd59e","abstract_canon_sha256":"c7ac7dca516281326a600a8b10c89c38d2aa3711068887794922f6d7662a6457"},"schema_version":"1.0"},"canonical_sha256":"14dd06151b80fc28eb4d5838b4261e8e8cdd799f2c892a02ae60420d24ba1095","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:49:45.312215Z","signature_b64":"QHOSbclQUvNfrq1EezBUS7N3zRgwPt/M2sr8n/4TsxLIWvFSsIT3oIoQtjYjvoOFvJebBNvT2R8KVHt0hTWQBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"14dd06151b80fc28eb4d5838b4261e8e8cdd799f2c892a02ae60420d24ba1095","last_reissued_at":"2026-07-05T06:49:45.311734Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:49:45.311734Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2309.05705","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":"2026-07-05T06:49:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S+5nOhUSJW6oRO/BNHPtle7+iwqYkAGluLOa9TiEvD33nMo9UPbKwPkkMRkdOHAg/YxzQ05QMXC7MV149hCbAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T03:34:00.594106Z"},"content_sha256":"959b4707fd1bfb8494bf33fcbe7ce6a32b6a8e9b2dcf88ae31bb2155b20d8815","schema_version":"1.0","event_id":"sha256:959b4707fd1bfb8494bf33fcbe7ce6a32b6a8e9b2dcf88ae31bb2155b20d8815"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:CTOQMFI3QD6CR22NLA4LIJQ6R2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Statistical Aspects of X-ray Spectral Analysis","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"Johannes Buchner, Peter Boorman","submitted_at":"2023-09-11T18:00:02Z","abstract_excerpt":"This handbook chapter gives a modern introduction to spectral analysis of celestial X-ray sources. Concepts presented include the instrumentation response, the linear modelling approximation, Poisson count statistics and the Gaussian approximation, data re-binning, visualisation techniques, handling backgrounds, Bayesian and frequentist viewpoints, uncertainty quantification of model parameters, model checking, model comparison, and inferring population distributions. Realistic hands-on example exercises with accompanying data files and code are included to apply the theoretical concepts in pr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.05705","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/2309.05705/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":"2026-07-05T06:49:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qEvOZ3mmMVo1bS3ZaNzigWprNm5AfIkYvcqMA3zEJv07+CWLLbSTkn/RtHX5xx6e7gmvADmwg0c+diK3vbQPCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-21T03:34:00.594646Z"},"content_sha256":"76c333d92d761ac36d38365c5939a6be971cc82fe307414a61d678e761946b74","schema_version":"1.0","event_id":"sha256:76c333d92d761ac36d38365c5939a6be971cc82fe307414a61d678e761946b74"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CTOQMFI3QD6CR22NLA4LIJQ6R2/bundle.json","state_url":"https://pith.science/pith/CTOQMFI3QD6CR22NLA4LIJQ6R2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CTOQMFI3QD6CR22NLA4LIJQ6R2/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":"2026-08-21T03:34:00Z","links":{"resolver":"https://pith.science/pith/CTOQMFI3QD6CR22NLA4LIJQ6R2","bundle":"https://pith.science/pith/CTOQMFI3QD6CR22NLA4LIJQ6R2/bundle.json","state":"https://pith.science/pith/CTOQMFI3QD6CR22NLA4LIJQ6R2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CTOQMFI3QD6CR22NLA4LIJQ6R2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:CTOQMFI3QD6CR22NLA4LIJQ6R2","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":"c7ac7dca516281326a600a8b10c89c38d2aa3711068887794922f6d7662a6457","cross_cats_sorted":["astro-ph.IM"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-09-11T18:00:02Z","title_canon_sha256":"572db8af1131fbbd016398bd788faf4c4f374442b501fb97fc3e564aba4dd59e"},"schema_version":"1.0","source":{"id":"2309.05705","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2309.05705","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"arxiv_version","alias_value":"2309.05705v1","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2309.05705","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"pith_short_12","alias_value":"CTOQMFI3QD6C","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"pith_short_16","alias_value":"CTOQMFI3QD6CR22N","created_at":"2026-07-05T06:49:45Z"},{"alias_kind":"pith_short_8","alias_value":"CTOQMFI3","created_at":"2026-07-05T06:49:45Z"}],"graph_snapshots":[{"event_id":"sha256:76c333d92d761ac36d38365c5939a6be971cc82fe307414a61d678e761946b74","target":"graph","created_at":"2026-07-05T06:49:45Z","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/2309.05705/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This handbook chapter gives a modern introduction to spectral analysis of celestial X-ray sources. Concepts presented include the instrumentation response, the linear modelling approximation, Poisson count statistics and the Gaussian approximation, data re-binning, visualisation techniques, handling backgrounds, Bayesian and frequentist viewpoints, uncertainty quantification of model parameters, model checking, model comparison, and inferring population distributions. Realistic hands-on example exercises with accompanying data files and code are included to apply the theoretical concepts in pr","authors_text":"Johannes Buchner, Peter Boorman","cross_cats":["astro-ph.IM"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-09-11T18:00:02Z","title":"Statistical Aspects of X-ray Spectral Analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2309.05705","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":"sha256:959b4707fd1bfb8494bf33fcbe7ce6a32b6a8e9b2dcf88ae31bb2155b20d8815","target":"record","created_at":"2026-07-05T06:49:45Z","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":"c7ac7dca516281326a600a8b10c89c38d2aa3711068887794922f6d7662a6457","cross_cats_sorted":["astro-ph.IM"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2023-09-11T18:00:02Z","title_canon_sha256":"572db8af1131fbbd016398bd788faf4c4f374442b501fb97fc3e564aba4dd59e"},"schema_version":"1.0","source":{"id":"2309.05705","kind":"arxiv","version":1}},"canonical_sha256":"14dd06151b80fc28eb4d5838b4261e8e8cdd799f2c892a02ae60420d24ba1095","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"14dd06151b80fc28eb4d5838b4261e8e8cdd799f2c892a02ae60420d24ba1095","first_computed_at":"2026-07-05T06:49:45.311734Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:49:45.311734Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QHOSbclQUvNfrq1EezBUS7N3zRgwPt/M2sr8n/4TsxLIWvFSsIT3oIoQtjYjvoOFvJebBNvT2R8KVHt0hTWQBg==","signature_status":"signed_v1","signed_at":"2026-07-05T06:49:45.312215Z","signed_message":"canonical_sha256_bytes"},"source_id":"2309.05705","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:959b4707fd1bfb8494bf33fcbe7ce6a32b6a8e9b2dcf88ae31bb2155b20d8815","sha256:76c333d92d761ac36d38365c5939a6be971cc82fe307414a61d678e761946b74"],"state_sha256":"6e7c99283cf6e50af13f9c5d5286be64f93cff44f8af0040f9966446682da6d3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yzGRL4Tas4I61iNCWBuIkL7RAC3s6UbOrQpMR3FW/swj9dQccaG3R4uoKUQNeOcnxCFdYxkLeKKafCT35Y17BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-21T03:34:00.599484Z","bundle_sha256":"2d365cef23a402ab39713bfd78e683efa604191c4c667e5de25b214644a3d392"}}