{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:LQ2ZNDOJNRMDRPBTYWCVST6VYB","short_pith_number":"pith:LQ2ZNDOJ","canonical_record":{"source":{"id":"1510.08472","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-28T20:19:53Z","cross_cats_sorted":["astro-ph.CO","astro-ph.HE","gr-qc"],"title_canon_sha256":"2c21fb28641c358bd6ea01ef7dd3a2abc4d3b2efeb31e08afca694be5b9ac1d5","abstract_canon_sha256":"0adadd13f4f3ef6f89237f643d978895bc088cc81d5b6e987d6191096b94daad"},"schema_version":"1.0"},"canonical_sha256":"5c35968dc96c5838bc33c585594fd5c062514878d5a71d24fb80ab8dae8c8f4d","source":{"kind":"arxiv","id":"1510.08472","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.08472","created_at":"2026-05-18T01:17:32Z"},{"alias_kind":"arxiv_version","alias_value":"1510.08472v2","created_at":"2026-05-18T01:17:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.08472","created_at":"2026-05-18T01:17:32Z"},{"alias_kind":"pith_short_12","alias_value":"LQ2ZNDOJNRMD","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LQ2ZNDOJNRMDRPBT","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LQ2ZNDOJ","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:LQ2ZNDOJNRMDRPBTYWCVST6VYB","target":"record","payload":{"canonical_record":{"source":{"id":"1510.08472","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-28T20:19:53Z","cross_cats_sorted":["astro-ph.CO","astro-ph.HE","gr-qc"],"title_canon_sha256":"2c21fb28641c358bd6ea01ef7dd3a2abc4d3b2efeb31e08afca694be5b9ac1d5","abstract_canon_sha256":"0adadd13f4f3ef6f89237f643d978895bc088cc81d5b6e987d6191096b94daad"},"schema_version":"1.0"},"canonical_sha256":"5c35968dc96c5838bc33c585594fd5c062514878d5a71d24fb80ab8dae8c8f4d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:17:32.805985Z","signature_b64":"yuSOXxWAnxVR9JTWFMR33bcHEbRvegdqfHpXIC8TiTq3o/w+WLDXr1pNVuDu9GxgFea7wb9xbpkdqVH4d9NlCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5c35968dc96c5838bc33c585594fd5c062514878d5a71d24fb80ab8dae8c8f4d","last_reissued_at":"2026-05-18T01:17:32.805259Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:17:32.805259Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.08472","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:17:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DEPKMYkeHKWSA7nv+Xw/PGy0N8vpGLsBPid0WkNg/unyeXY4IOc99VMG4+OyyJfs59816FnPbYCsbjOYeTQNCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T18:38:08.268540Z"},"content_sha256":"bb117af122230ca21a3c148dc6371037675ff3525696c8bf4b20528a5138d44c","schema_version":"1.0","event_id":"sha256:bb117af122230ca21a3c148dc6371037675ff3525696c8bf4b20528a5138d44c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:LQ2ZNDOJNRMDRPBTYWCVST6VYB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Constraints on Individual Supermassive Black Hole Binaries from Pulsar Timing Array Limits on Continuous Gravitational Waves","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.HE","gr-qc"],"primary_cat":"astro-ph.GA","authors_text":"Chung-Pei Ma, Katelin Schutz","submitted_at":"2015-10-28T20:19:53Z","abstract_excerpt":"Pulsar timing arrays (PTAs) are placing increasingly stringent constraints on the strain amplitude of continuous gravitational waves emitted by supermassive black hole binaries on subparsec scales. In this paper, we incorporate independent information about the dynamical masses $M_{bh}$ of supermassive black holes in specific galaxies at known distances and use this additional information to further constrain whether or not those galaxies could host a detectable supermassive black hole binary. We estimate the strain amplitudes from individual binaries as a function of binary mass ratio for two"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.08472","kind":"arxiv","version":2},"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":"2026-05-18T01:17:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"knoppksgjoMawDJnEV3YA/eyIP6vH3LwgfCRE/KoKGjxUrniqpfL1OqAEFRIGZOwOqh8UC+0gdPcZC2g0uRRBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T18:38:08.268888Z"},"content_sha256":"18623505c563ab6c71bcdf0c23e38449dd9f00fd50ba6f296714719986e8799c","schema_version":"1.0","event_id":"sha256:18623505c563ab6c71bcdf0c23e38449dd9f00fd50ba6f296714719986e8799c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LQ2ZNDOJNRMDRPBTYWCVST6VYB/bundle.json","state_url":"https://pith.science/pith/LQ2ZNDOJNRMDRPBTYWCVST6VYB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LQ2ZNDOJNRMDRPBTYWCVST6VYB/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":"2026-06-02T18:38:08Z","links":{"resolver":"https://pith.science/pith/LQ2ZNDOJNRMDRPBTYWCVST6VYB","bundle":"https://pith.science/pith/LQ2ZNDOJNRMDRPBTYWCVST6VYB/bundle.json","state":"https://pith.science/pith/LQ2ZNDOJNRMDRPBTYWCVST6VYB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LQ2ZNDOJNRMDRPBTYWCVST6VYB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:LQ2ZNDOJNRMDRPBTYWCVST6VYB","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":"0adadd13f4f3ef6f89237f643d978895bc088cc81d5b6e987d6191096b94daad","cross_cats_sorted":["astro-ph.CO","astro-ph.HE","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-28T20:19:53Z","title_canon_sha256":"2c21fb28641c358bd6ea01ef7dd3a2abc4d3b2efeb31e08afca694be5b9ac1d5"},"schema_version":"1.0","source":{"id":"1510.08472","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.08472","created_at":"2026-05-18T01:17:32Z"},{"alias_kind":"arxiv_version","alias_value":"1510.08472v2","created_at":"2026-05-18T01:17:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.08472","created_at":"2026-05-18T01:17:32Z"},{"alias_kind":"pith_short_12","alias_value":"LQ2ZNDOJNRMD","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LQ2ZNDOJNRMDRPBT","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LQ2ZNDOJ","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:18623505c563ab6c71bcdf0c23e38449dd9f00fd50ba6f296714719986e8799c","target":"graph","created_at":"2026-05-18T01:17:32Z","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":"Pulsar timing arrays (PTAs) are placing increasingly stringent constraints on the strain amplitude of continuous gravitational waves emitted by supermassive black hole binaries on subparsec scales. In this paper, we incorporate independent information about the dynamical masses $M_{bh}$ of supermassive black holes in specific galaxies at known distances and use this additional information to further constrain whether or not those galaxies could host a detectable supermassive black hole binary. We estimate the strain amplitudes from individual binaries as a function of binary mass ratio for two","authors_text":"Chung-Pei Ma, Katelin Schutz","cross_cats":["astro-ph.CO","astro-ph.HE","gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-28T20:19:53Z","title":"Constraints on Individual Supermassive Black Hole Binaries from Pulsar Timing Array Limits on Continuous Gravitational Waves"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.08472","kind":"arxiv","version":2},"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:bb117af122230ca21a3c148dc6371037675ff3525696c8bf4b20528a5138d44c","target":"record","created_at":"2026-05-18T01:17:32Z","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":"0adadd13f4f3ef6f89237f643d978895bc088cc81d5b6e987d6191096b94daad","cross_cats_sorted":["astro-ph.CO","astro-ph.HE","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-28T20:19:53Z","title_canon_sha256":"2c21fb28641c358bd6ea01ef7dd3a2abc4d3b2efeb31e08afca694be5b9ac1d5"},"schema_version":"1.0","source":{"id":"1510.08472","kind":"arxiv","version":2}},"canonical_sha256":"5c35968dc96c5838bc33c585594fd5c062514878d5a71d24fb80ab8dae8c8f4d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5c35968dc96c5838bc33c585594fd5c062514878d5a71d24fb80ab8dae8c8f4d","first_computed_at":"2026-05-18T01:17:32.805259Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:17:32.805259Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yuSOXxWAnxVR9JTWFMR33bcHEbRvegdqfHpXIC8TiTq3o/w+WLDXr1pNVuDu9GxgFea7wb9xbpkdqVH4d9NlCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:17:32.805985Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.08472","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bb117af122230ca21a3c148dc6371037675ff3525696c8bf4b20528a5138d44c","sha256:18623505c563ab6c71bcdf0c23e38449dd9f00fd50ba6f296714719986e8799c"],"state_sha256":"a1812efea8881f2f1ecce6078308e5e17666ef9d927dcb39e90c96843869759d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8z5U2DKg4o8ozAPgvUaWx1P1qXxw+RSJ3qHdPCP72uPFnll3Sz7yUZj00UNfnkiRsGA1sdvPJt/JLXLbnFALDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T18:38:08.271015Z","bundle_sha256":"751ed7f36f23aa6cd5950e984665fcc41cd03612f87051077f976fb239eecf49"}}