{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1995:5NYX43T3FGJHQ6KJVOPKAXKNNO","short_pith_number":"pith:5NYX43T3","canonical_record":{"source":{"id":"astro-ph/9508057","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1995-08-12T17:12:00Z","cross_cats_sorted":[],"title_canon_sha256":"5dc36968153f3aba36cab23e44e7022af7edd8623fd249440637549d56b21c02","abstract_canon_sha256":"01d1bf62258a07e83d1244bdc0682921079f1b2fc87c73071796034e9d0ede22"},"schema_version":"1.0"},"canonical_sha256":"eb717e6e7b2992787949ab9ea05d4d6b8cf3f3315228492ac4f3ef622c5402b4","source":{"kind":"arxiv","id":"astro-ph/9508057","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9508057","created_at":"2026-05-18T01:40:22Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9508057v1","created_at":"2026-05-18T01:40:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9508057","created_at":"2026-05-18T01:40:22Z"},{"alias_kind":"pith_short_12","alias_value":"5NYX43T3FGJH","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"5NYX43T3FGJHQ6KJ","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"5NYX43T3","created_at":"2026-05-18T12:25:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1995:5NYX43T3FGJHQ6KJVOPKAXKNNO","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9508057","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1995-08-12T17:12:00Z","cross_cats_sorted":[],"title_canon_sha256":"5dc36968153f3aba36cab23e44e7022af7edd8623fd249440637549d56b21c02","abstract_canon_sha256":"01d1bf62258a07e83d1244bdc0682921079f1b2fc87c73071796034e9d0ede22"},"schema_version":"1.0"},"canonical_sha256":"eb717e6e7b2992787949ab9ea05d4d6b8cf3f3315228492ac4f3ef622c5402b4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:22.878596Z","signature_b64":"/2xnVOLFG3znkT6oJt0dZ7t65Go0saMIQ9pyl52dOIipnGTE8cYaejQUbYtEMjxSw4rSd3u9AB5LL3/IVLmvBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eb717e6e7b2992787949ab9ea05d4d6b8cf3f3315228492ac4f3ef622c5402b4","last_reissued_at":"2026-05-18T01:40:22.877997Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:22.877997Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9508057","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":"2026-05-18T01:40:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KRvM9ia0IskKCUYIJlP+CMxPBaRbdlUkLQK7rHcZhuKHFVfbwEYoc8+Nz3TPHT8G9oO0IHqLn2FzxjfWRenYCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T08:17:44.422050Z"},"content_sha256":"1d1bacbd1f75c32b84ca07ffd68e7223df55699b4a885599d2eb7fc8c2e0ffcf","schema_version":"1.0","event_id":"sha256:1d1bacbd1f75c32b84ca07ffd68e7223df55699b4a885599d2eb7fc8c2e0ffcf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1995:5NYX43T3FGJHQ6KJVOPKAXKNNO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"ROSAT PSPC observations of the infrared quasar IRAS 13349+2438: evidence for a warm absorber with internal dust","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A.C. Fabian, K.A. Pounds, W.N. Brandt","submitted_at":"1995-08-12T17:12:00Z","abstract_excerpt":"We present spatial, temporal and spectral analyses of ROSAT Position Sensitive Proportional Counter (PSPC) observations of the infrared loud quasar IRAS 13349+2438. IRAS 13349+2438 is the archetypal highly-polarized radio-quiet QSO and has an optical/infrared luminosity of about 2E46 erg/s. We detect variability in the ROSAT count rate by a factor of 4.1 in about one year, and there is also evidence for about 25 per cent variability within one week. We find no evidence for large intrinsic cold absorption of soft X-rays. These two facts have important consequences for the scattering-plus-transm"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9508057","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:40:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vasFX2mK72qDy7TfXbmHXIwQq1aDVWYok/7OogNhz4Op22Kw3WvOqmdJgJXoy2cuVDAjOC2tbdg6wgEDcgrkBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T08:17:44.422813Z"},"content_sha256":"c4c2f35dff7ce4459f9d66d2bf97e5442d42fd7cc151d8909b8ca28a14c10234","schema_version":"1.0","event_id":"sha256:c4c2f35dff7ce4459f9d66d2bf97e5442d42fd7cc151d8909b8ca28a14c10234"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5NYX43T3FGJHQ6KJVOPKAXKNNO/bundle.json","state_url":"https://pith.science/pith/5NYX43T3FGJHQ6KJVOPKAXKNNO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5NYX43T3FGJHQ6KJVOPKAXKNNO/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":"2026-06-07T08:17:44Z","links":{"resolver":"https://pith.science/pith/5NYX43T3FGJHQ6KJVOPKAXKNNO","bundle":"https://pith.science/pith/5NYX43T3FGJHQ6KJVOPKAXKNNO/bundle.json","state":"https://pith.science/pith/5NYX43T3FGJHQ6KJVOPKAXKNNO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5NYX43T3FGJHQ6KJVOPKAXKNNO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1995:5NYX43T3FGJHQ6KJVOPKAXKNNO","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":"01d1bf62258a07e83d1244bdc0682921079f1b2fc87c73071796034e9d0ede22","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1995-08-12T17:12:00Z","title_canon_sha256":"5dc36968153f3aba36cab23e44e7022af7edd8623fd249440637549d56b21c02"},"schema_version":"1.0","source":{"id":"astro-ph/9508057","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9508057","created_at":"2026-05-18T01:40:22Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9508057v1","created_at":"2026-05-18T01:40:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9508057","created_at":"2026-05-18T01:40:22Z"},{"alias_kind":"pith_short_12","alias_value":"5NYX43T3FGJH","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"5NYX43T3FGJHQ6KJ","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"5NYX43T3","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:c4c2f35dff7ce4459f9d66d2bf97e5442d42fd7cc151d8909b8ca28a14c10234","target":"graph","created_at":"2026-05-18T01:40:22Z","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"},"paper":{"abstract_excerpt":"We present spatial, temporal and spectral analyses of ROSAT Position Sensitive Proportional Counter (PSPC) observations of the infrared loud quasar IRAS 13349+2438. IRAS 13349+2438 is the archetypal highly-polarized radio-quiet QSO and has an optical/infrared luminosity of about 2E46 erg/s. We detect variability in the ROSAT count rate by a factor of 4.1 in about one year, and there is also evidence for about 25 per cent variability within one week. We find no evidence for large intrinsic cold absorption of soft X-rays. These two facts have important consequences for the scattering-plus-transm","authors_text":"A.C. Fabian, K.A. Pounds, W.N. Brandt","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1995-08-12T17:12:00Z","title":"ROSAT PSPC observations of the infrared quasar IRAS 13349+2438: evidence for a warm absorber with internal dust"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9508057","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":"sha256:1d1bacbd1f75c32b84ca07ffd68e7223df55699b4a885599d2eb7fc8c2e0ffcf","target":"record","created_at":"2026-05-18T01:40:22Z","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":"01d1bf62258a07e83d1244bdc0682921079f1b2fc87c73071796034e9d0ede22","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1995-08-12T17:12:00Z","title_canon_sha256":"5dc36968153f3aba36cab23e44e7022af7edd8623fd249440637549d56b21c02"},"schema_version":"1.0","source":{"id":"astro-ph/9508057","kind":"arxiv","version":1}},"canonical_sha256":"eb717e6e7b2992787949ab9ea05d4d6b8cf3f3315228492ac4f3ef622c5402b4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eb717e6e7b2992787949ab9ea05d4d6b8cf3f3315228492ac4f3ef622c5402b4","first_computed_at":"2026-05-18T01:40:22.877997Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:40:22.877997Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/2xnVOLFG3znkT6oJt0dZ7t65Go0saMIQ9pyl52dOIipnGTE8cYaejQUbYtEMjxSw4rSd3u9AB5LL3/IVLmvBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:40:22.878596Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9508057","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d1bacbd1f75c32b84ca07ffd68e7223df55699b4a885599d2eb7fc8c2e0ffcf","sha256:c4c2f35dff7ce4459f9d66d2bf97e5442d42fd7cc151d8909b8ca28a14c10234"],"state_sha256":"19e57273a4837b20a603b9de8520cea9496126f71f95321db6b74c2b6108bb02"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Cfkgg0h/kPkvNQsHv0X6pwV+b2nJVA1WSKJHqQ5oyMT/4ajXaUnB+AP4RN+3OHNRseaqTIJjL1Jyg9QYDzLEAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T08:17:44.426393Z","bundle_sha256":"a209b5c0297c331fd6050f681d627a8513e0a17131d6b2b154c3e970ba996bae"}}