{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:HXWU3MRSUXTXPBHESYT7AN6DWM","short_pith_number":"pith:HXWU3MRS","canonical_record":{"source":{"id":"astro-ph/0303548","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-03-25T12:36:54Z","cross_cats_sorted":[],"title_canon_sha256":"77e3bfab36253996cc615da879d1e27467a0542ff75e657100243b243dc55f20","abstract_canon_sha256":"9c46a1e38cd95230a8bdbcef8a98f470fbb97114e81333136d9a28bff3e84e21"},"schema_version":"1.0"},"canonical_sha256":"3ded4db232a5e77784e49627f037c3b333276a2bc5ff104f973cf347e492126e","source":{"kind":"arxiv","id":"astro-ph/0303548","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0303548","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0303548v1","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0303548","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"pith_short_12","alias_value":"HXWU3MRSUXTX","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"pith_short_16","alias_value":"HXWU3MRSUXTXPBHE","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"pith_short_8","alias_value":"HXWU3MRS","created_at":"2026-07-04T16:36:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:HXWU3MRSUXTXPBHESYT7AN6DWM","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0303548","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-03-25T12:36:54Z","cross_cats_sorted":[],"title_canon_sha256":"77e3bfab36253996cc615da879d1e27467a0542ff75e657100243b243dc55f20","abstract_canon_sha256":"9c46a1e38cd95230a8bdbcef8a98f470fbb97114e81333136d9a28bff3e84e21"},"schema_version":"1.0"},"canonical_sha256":"3ded4db232a5e77784e49627f037c3b333276a2bc5ff104f973cf347e492126e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:36:43.935067Z","signature_b64":"iJf8rfqv7uywGT1OvT/T6Isi2hZj5wmgm2IVcP9jj3aVHGsx3+pAcT51v/rkY7htN517o+VSfnDFCCVykMf2Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3ded4db232a5e77784e49627f037c3b333276a2bc5ff104f973cf347e492126e","last_reissued_at":"2026-07-04T16:36:43.934654Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:36:43.934654Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0303548","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":"2026-07-04T16:36:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yf4vs80a4ynX52ZdLBdvFqdg+3WsgMu1lRg7z6nSCb9J29MWrSP9g6z3M1y+eWp+fM1/xmd1ttY671L5wQuWCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T15:51:20.881749Z"},"content_sha256":"0ec0d2540433526d0b379797883824afe7f410213da53db222e8c510a09b89a4","schema_version":"1.0","event_id":"sha256:0ec0d2540433526d0b379797883824afe7f410213da53db222e8c510a09b89a4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:HXWU3MRSUXTXPBHESYT7AN6DWM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Timescales of Soft X-Ray Variability and Physical Constraints in Agns","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"W. Bian, Y. Zhao","submitted_at":"2003-03-25T12:36:54Z","abstract_excerpt":"We present soft X-ray variability time-scales for 65 active galactic nuclei (AGNs) derived from ROSAT/PSPC pointing data. For these 65 objects with obvious exponential increasing or decreasing patterns in their light curves, we use the exponential time-scales and find they are more suitable for analyzing ROSAT light curve data. We also discuss some physical constraints on the central engine implied by our results. Assuming that this soft X-ray variability exponential time-scale is approximately equal to the thermal timescale of the standard accretion disk, we obtain the accretion rate, the siz"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0303548","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/0303548/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":"2026-07-04T16:36:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kTTLUFz/By0g1qdwwnnR99SSiVOHOwnL4xLs8GWq6ZaOVx1ypk4YGcx1L+b8GIcuMz/mQB0Uz+BdK5Mg/+8bBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T15:51:20.882450Z"},"content_sha256":"ad731e74189955151eac565961fb26b662d8fe7f02eee56b127645195bb1ea2d","schema_version":"1.0","event_id":"sha256:ad731e74189955151eac565961fb26b662d8fe7f02eee56b127645195bb1ea2d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HXWU3MRSUXTXPBHESYT7AN6DWM/bundle.json","state_url":"https://pith.science/pith/HXWU3MRSUXTXPBHESYT7AN6DWM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HXWU3MRSUXTXPBHESYT7AN6DWM/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":"2026-08-10T15:51:20Z","links":{"resolver":"https://pith.science/pith/HXWU3MRSUXTXPBHESYT7AN6DWM","bundle":"https://pith.science/pith/HXWU3MRSUXTXPBHESYT7AN6DWM/bundle.json","state":"https://pith.science/pith/HXWU3MRSUXTXPBHESYT7AN6DWM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HXWU3MRSUXTXPBHESYT7AN6DWM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:HXWU3MRSUXTXPBHESYT7AN6DWM","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":"9c46a1e38cd95230a8bdbcef8a98f470fbb97114e81333136d9a28bff3e84e21","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-03-25T12:36:54Z","title_canon_sha256":"77e3bfab36253996cc615da879d1e27467a0542ff75e657100243b243dc55f20"},"schema_version":"1.0","source":{"id":"astro-ph/0303548","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0303548","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0303548v1","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0303548","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"pith_short_12","alias_value":"HXWU3MRSUXTX","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"pith_short_16","alias_value":"HXWU3MRSUXTXPBHE","created_at":"2026-07-04T16:36:43Z"},{"alias_kind":"pith_short_8","alias_value":"HXWU3MRS","created_at":"2026-07-04T16:36:43Z"}],"graph_snapshots":[{"event_id":"sha256:ad731e74189955151eac565961fb26b662d8fe7f02eee56b127645195bb1ea2d","target":"graph","created_at":"2026-07-04T16:36:43Z","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/astro-ph/0303548/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present soft X-ray variability time-scales for 65 active galactic nuclei (AGNs) derived from ROSAT/PSPC pointing data. For these 65 objects with obvious exponential increasing or decreasing patterns in their light curves, we use the exponential time-scales and find they are more suitable for analyzing ROSAT light curve data. We also discuss some physical constraints on the central engine implied by our results. Assuming that this soft X-ray variability exponential time-scale is approximately equal to the thermal timescale of the standard accretion disk, we obtain the accretion rate, the siz","authors_text":"W. Bian, Y. Zhao","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-03-25T12:36:54Z","title":"Timescales of Soft X-Ray Variability and Physical Constraints in Agns"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0303548","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":"sha256:0ec0d2540433526d0b379797883824afe7f410213da53db222e8c510a09b89a4","target":"record","created_at":"2026-07-04T16:36:43Z","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":"9c46a1e38cd95230a8bdbcef8a98f470fbb97114e81333136d9a28bff3e84e21","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-03-25T12:36:54Z","title_canon_sha256":"77e3bfab36253996cc615da879d1e27467a0542ff75e657100243b243dc55f20"},"schema_version":"1.0","source":{"id":"astro-ph/0303548","kind":"arxiv","version":1}},"canonical_sha256":"3ded4db232a5e77784e49627f037c3b333276a2bc5ff104f973cf347e492126e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3ded4db232a5e77784e49627f037c3b333276a2bc5ff104f973cf347e492126e","first_computed_at":"2026-07-04T16:36:43.934654Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:36:43.934654Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iJf8rfqv7uywGT1OvT/T6Isi2hZj5wmgm2IVcP9jj3aVHGsx3+pAcT51v/rkY7htN517o+VSfnDFCCVykMf2Bw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:36:43.935067Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0303548","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0ec0d2540433526d0b379797883824afe7f410213da53db222e8c510a09b89a4","sha256:ad731e74189955151eac565961fb26b662d8fe7f02eee56b127645195bb1ea2d"],"state_sha256":"42379ee6fa5b252c4ab37e436ed54347a1392c3379b27c7a25c403dd3778059a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aXmuNjcpD/q6M9xmdwtIs1X+ZYLQNeEql/jQouGkmnCL4m+BarEZkv8clwVGc81efO43QogdBH8TlwTye2c3AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T15:51:20.887321Z","bundle_sha256":"a87419bec4b6071374fcf56452a7756638acb7015161c89506d5ad037e5a1160"}}