{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:C4DTUWSQTWPAUFOH6F2O6W6EVO","short_pith_number":"pith:C4DTUWSQ","canonical_record":{"source":{"id":"0908.4039","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-08-27T16:31:05Z","cross_cats_sorted":[],"title_canon_sha256":"9497468c55bff166ac14ed26ba0ddb1d470bb722269b4ef39c38a112b9597ac6","abstract_canon_sha256":"fd51e50d517989c93e99158d808dbe4d6a72113dd06edeb096447dde17fcbb15"},"schema_version":"1.0"},"canonical_sha256":"17073a5a509d9e0a15c7f174ef5bc4ab82b6fd96e3f9d02d0757945c570a3aeb","source":{"kind":"arxiv","id":"0908.4039","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.4039","created_at":"2026-05-18T02:12:22Z"},{"alias_kind":"arxiv_version","alias_value":"0908.4039v1","created_at":"2026-05-18T02:12:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.4039","created_at":"2026-05-18T02:12:22Z"},{"alias_kind":"pith_short_12","alias_value":"C4DTUWSQTWPA","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"C4DTUWSQTWPAUFOH","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"C4DTUWSQ","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:C4DTUWSQTWPAUFOH6F2O6W6EVO","target":"record","payload":{"canonical_record":{"source":{"id":"0908.4039","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-08-27T16:31:05Z","cross_cats_sorted":[],"title_canon_sha256":"9497468c55bff166ac14ed26ba0ddb1d470bb722269b4ef39c38a112b9597ac6","abstract_canon_sha256":"fd51e50d517989c93e99158d808dbe4d6a72113dd06edeb096447dde17fcbb15"},"schema_version":"1.0"},"canonical_sha256":"17073a5a509d9e0a15c7f174ef5bc4ab82b6fd96e3f9d02d0757945c570a3aeb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:22.081171Z","signature_b64":"gvlt7cplnOH2nS7iUsbIrvPEDdsaA/K/BwaYdLBGqC1+JT390f7M3XP/2sonlMh4o5QA03SLhkqlt3CrHNhECA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"17073a5a509d9e0a15c7f174ef5bc4ab82b6fd96e3f9d02d0757945c570a3aeb","last_reissued_at":"2026-05-18T02:12:22.080464Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:22.080464Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0908.4039","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":"2026-05-18T02:12:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6Dfn2RnOdIwX9ERAJ1FeqgMmEUg1kv56Qjh47ygNWxc3czisRB8tT51AapthrEf22ZVtB+QmJ7O15PxvSj8XCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T22:01:19.025288Z"},"content_sha256":"e8cb47ad8ec2942cd772aa3581894b9f6e484f7e16342f3f0d32a9b42f77307e","schema_version":"1.0","event_id":"sha256:e8cb47ad8ec2942cd772aa3581894b9f6e484f7e16342f3f0d32a9b42f77307e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:C4DTUWSQTWPAUFOH6F2O6W6EVO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Type I X-ray bursts, burst oscillations and kHz quasi-periodic oscillations in the neutron star system IGR J17191-2821","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Patruno, C. Markwardt, D. Altamirano, J. Swank, M. Klein-Wolt, M. Linares, M. van der Klis, N. Degenaar, R. Wijnands","submitted_at":"2009-08-27T16:31:05Z","abstract_excerpt":"We present a detailed study of the X-ray energy and power spectral properties of the neutron star transient IGR J17191-2821. We discovered four instances of pairs of simultaneous kilohertz quasi-periodic oscillations (kHz QPOs). The frequency difference between these kHz QPOs is between 315 Hz and 362 Hz. We also report on the detection of five thermonuclear type-I X-ray bursts and the discovery of burst oscillations at ~294 Hz during three of them. Finally, we report on a faint and short outburst precursor, which occurred about two months before the main outburst. Our results on the broadband"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.4039","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":"2026-05-18T02:12:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iafnk/Rx29JaZAlG7yvbhDQvG1umivy5ICzCxtJKcm4LOvhoBZbxknbxc8BJjx1nDB9L8B547HgX5YRrc4MHAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T22:01:19.025655Z"},"content_sha256":"9051fab62265846adf52bb1222f198d71bb147cd1d5f7cb5800b8e9d6983392f","schema_version":"1.0","event_id":"sha256:9051fab62265846adf52bb1222f198d71bb147cd1d5f7cb5800b8e9d6983392f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C4DTUWSQTWPAUFOH6F2O6W6EVO/bundle.json","state_url":"https://pith.science/pith/C4DTUWSQTWPAUFOH6F2O6W6EVO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C4DTUWSQTWPAUFOH6F2O6W6EVO/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":"2026-06-02T22:01:19Z","links":{"resolver":"https://pith.science/pith/C4DTUWSQTWPAUFOH6F2O6W6EVO","bundle":"https://pith.science/pith/C4DTUWSQTWPAUFOH6F2O6W6EVO/bundle.json","state":"https://pith.science/pith/C4DTUWSQTWPAUFOH6F2O6W6EVO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C4DTUWSQTWPAUFOH6F2O6W6EVO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:C4DTUWSQTWPAUFOH6F2O6W6EVO","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":"fd51e50d517989c93e99158d808dbe4d6a72113dd06edeb096447dde17fcbb15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-08-27T16:31:05Z","title_canon_sha256":"9497468c55bff166ac14ed26ba0ddb1d470bb722269b4ef39c38a112b9597ac6"},"schema_version":"1.0","source":{"id":"0908.4039","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0908.4039","created_at":"2026-05-18T02:12:22Z"},{"alias_kind":"arxiv_version","alias_value":"0908.4039v1","created_at":"2026-05-18T02:12:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0908.4039","created_at":"2026-05-18T02:12:22Z"},{"alias_kind":"pith_short_12","alias_value":"C4DTUWSQTWPA","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"C4DTUWSQTWPAUFOH","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"C4DTUWSQ","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:9051fab62265846adf52bb1222f198d71bb147cd1d5f7cb5800b8e9d6983392f","target":"graph","created_at":"2026-05-18T02:12:22Z","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 a detailed study of the X-ray energy and power spectral properties of the neutron star transient IGR J17191-2821. We discovered four instances of pairs of simultaneous kilohertz quasi-periodic oscillations (kHz QPOs). The frequency difference between these kHz QPOs is between 315 Hz and 362 Hz. We also report on the detection of five thermonuclear type-I X-ray bursts and the discovery of burst oscillations at ~294 Hz during three of them. Finally, we report on a faint and short outburst precursor, which occurred about two months before the main outburst. Our results on the broadband","authors_text":"A. Patruno, C. Markwardt, D. Altamirano, J. Swank, M. Klein-Wolt, M. Linares, M. van der Klis, N. Degenaar, R. Wijnands","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-08-27T16:31:05Z","title":"Type I X-ray bursts, burst oscillations and kHz quasi-periodic oscillations in the neutron star system IGR J17191-2821"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0908.4039","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:e8cb47ad8ec2942cd772aa3581894b9f6e484f7e16342f3f0d32a9b42f77307e","target":"record","created_at":"2026-05-18T02:12:22Z","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":"fd51e50d517989c93e99158d808dbe4d6a72113dd06edeb096447dde17fcbb15","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-08-27T16:31:05Z","title_canon_sha256":"9497468c55bff166ac14ed26ba0ddb1d470bb722269b4ef39c38a112b9597ac6"},"schema_version":"1.0","source":{"id":"0908.4039","kind":"arxiv","version":1}},"canonical_sha256":"17073a5a509d9e0a15c7f174ef5bc4ab82b6fd96e3f9d02d0757945c570a3aeb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"17073a5a509d9e0a15c7f174ef5bc4ab82b6fd96e3f9d02d0757945c570a3aeb","first_computed_at":"2026-05-18T02:12:22.080464Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:22.080464Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gvlt7cplnOH2nS7iUsbIrvPEDdsaA/K/BwaYdLBGqC1+JT390f7M3XP/2sonlMh4o5QA03SLhkqlt3CrHNhECA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:22.081171Z","signed_message":"canonical_sha256_bytes"},"source_id":"0908.4039","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e8cb47ad8ec2942cd772aa3581894b9f6e484f7e16342f3f0d32a9b42f77307e","sha256:9051fab62265846adf52bb1222f198d71bb147cd1d5f7cb5800b8e9d6983392f"],"state_sha256":"06b60560a84d7285f051649fa61db61164d50b0d2b1127e0bf9358a25647952a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F0Xts26A7Soq7qh6Jv4jjCrSTwMlBAMh9OOUNGe3vaOKuQ4QeZ0gH/qPA/CsKNaft6UHWnQ25AIL4JMsmtC4Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T22:01:19.027565Z","bundle_sha256":"df92cb82f0c2e61c55d4b1664f7f4d06cdd2a58035d23a517c588c81f0e877c5"}}