{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:ZU7HHUYTVJZO4QITPJP26EV2L7","short_pith_number":"pith:ZU7HHUYT","canonical_record":{"source":{"id":"1608.07589","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-08-26T20:10:15Z","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"title_canon_sha256":"45c7a23e8d73fd35ac0aaaf7e2c9648b1198cf402de811c8c4dbb8f8ed62e875","abstract_canon_sha256":"d43501c8000a520c353f3025c43c76b2c6f10e72f81b8092383f112b6c63f682"},"schema_version":"1.0"},"canonical_sha256":"cd3e73d313aa72ee41137a5faf12ba5fe941c29a01a7090e7579ad57f603297a","source":{"kind":"arxiv","id":"1608.07589","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.07589","created_at":"2026-05-18T01:00:41Z"},{"alias_kind":"arxiv_version","alias_value":"1608.07589v2","created_at":"2026-05-18T01:00:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.07589","created_at":"2026-05-18T01:00:41Z"},{"alias_kind":"pith_short_12","alias_value":"ZU7HHUYTVJZO","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZU7HHUYTVJZO4QIT","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZU7HHUYT","created_at":"2026-05-18T12:30:55Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:ZU7HHUYTVJZO4QITPJP26EV2L7","target":"record","payload":{"canonical_record":{"source":{"id":"1608.07589","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-08-26T20:10:15Z","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"title_canon_sha256":"45c7a23e8d73fd35ac0aaaf7e2c9648b1198cf402de811c8c4dbb8f8ed62e875","abstract_canon_sha256":"d43501c8000a520c353f3025c43c76b2c6f10e72f81b8092383f112b6c63f682"},"schema_version":"1.0"},"canonical_sha256":"cd3e73d313aa72ee41137a5faf12ba5fe941c29a01a7090e7579ad57f603297a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:00:41.916593Z","signature_b64":"QNUQFKZk1KNTrwhHzmU6XVzyjYSaoshbzT2FqO4xeSNb8CHXxcUj0tfehMm4fyOj2bw6/4ol6zEUZuIyMOcQCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cd3e73d313aa72ee41137a5faf12ba5fe941c29a01a7090e7579ad57f603297a","last_reissued_at":"2026-05-18T01:00:41.916187Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:00:41.916187Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.07589","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":"2026-05-18T01:00:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sEp2scIblB6b7SLNjHOa8rOAN2pY13uz9s3pNdXu4eOi6muBkU0u0FEpeN8S/wjdPDgvaUpnPIqb3kugOnLtAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T07:57:20.091770Z"},"content_sha256":"66b957d618477b733d351acb388b026e8d518f708335b0eec892abd4fb87e308","schema_version":"1.0","event_id":"sha256:66b957d618477b733d351acb388b026e8d518f708335b0eec892abd4fb87e308"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:ZU7HHUYTVJZO4QITPJP26EV2L7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Einstein@home search for continuous gravitational waves from Cassiopeia A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","astro-ph.IM"],"primary_cat":"gr-qc","authors_text":"Badri Krishnan, Bernd Machenschalk, Bruce Allen, David Keitel, Heinz-Bernd Eggenstein, Karl Wette, Maria Alessandra Papa, Miroslav Shaltev, Oliver Bock, Reinhard Prix, Sylvia J. Zhu, Xavier Siemens","submitted_at":"2016-08-26T20:10:15Z","abstract_excerpt":"We report the results of a directed search for continuous gravitational-wave emission in a broad frequency range (between 50 and 1000 Hz) from the central compact object of the supernova remnant Cassiopeia A (Cas A). The data comes from the sixth science run of LIGO and the search is performed on the volunteer distributed computing network Einstein@Home. We find no significant signal candidate, and set the most constraining upper limits to date on the gravitational-wave emission from Cas A, which beat the indirect age-based upper limit across the entire search range. At around 170 Hz (the most"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.07589","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":"2026-05-18T01:00:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0XelcxXw4Nju29/Obk4HoJGxLM2Zz+Z+zraCzMfXgreKfo5Q6CDOwezJiDVr+DARFLbxbZejtLMcVU1JhaiRBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T07:57:20.092129Z"},"content_sha256":"08799b539d060c2a654a192c1faaec8f7d448d3ee029ddf18c5b92c3ad2f1761","schema_version":"1.0","event_id":"sha256:08799b539d060c2a654a192c1faaec8f7d448d3ee029ddf18c5b92c3ad2f1761"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZU7HHUYTVJZO4QITPJP26EV2L7/bundle.json","state_url":"https://pith.science/pith/ZU7HHUYTVJZO4QITPJP26EV2L7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZU7HHUYTVJZO4QITPJP26EV2L7/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":"2026-06-03T07:57:20Z","links":{"resolver":"https://pith.science/pith/ZU7HHUYTVJZO4QITPJP26EV2L7","bundle":"https://pith.science/pith/ZU7HHUYTVJZO4QITPJP26EV2L7/bundle.json","state":"https://pith.science/pith/ZU7HHUYTVJZO4QITPJP26EV2L7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZU7HHUYTVJZO4QITPJP26EV2L7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ZU7HHUYTVJZO4QITPJP26EV2L7","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":"d43501c8000a520c353f3025c43c76b2c6f10e72f81b8092383f112b6c63f682","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-08-26T20:10:15Z","title_canon_sha256":"45c7a23e8d73fd35ac0aaaf7e2c9648b1198cf402de811c8c4dbb8f8ed62e875"},"schema_version":"1.0","source":{"id":"1608.07589","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.07589","created_at":"2026-05-18T01:00:41Z"},{"alias_kind":"arxiv_version","alias_value":"1608.07589v2","created_at":"2026-05-18T01:00:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.07589","created_at":"2026-05-18T01:00:41Z"},{"alias_kind":"pith_short_12","alias_value":"ZU7HHUYTVJZO","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_16","alias_value":"ZU7HHUYTVJZO4QIT","created_at":"2026-05-18T12:30:55Z"},{"alias_kind":"pith_short_8","alias_value":"ZU7HHUYT","created_at":"2026-05-18T12:30:55Z"}],"graph_snapshots":[{"event_id":"sha256:08799b539d060c2a654a192c1faaec8f7d448d3ee029ddf18c5b92c3ad2f1761","target":"graph","created_at":"2026-05-18T01:00:41Z","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 report the results of a directed search for continuous gravitational-wave emission in a broad frequency range (between 50 and 1000 Hz) from the central compact object of the supernova remnant Cassiopeia A (Cas A). The data comes from the sixth science run of LIGO and the search is performed on the volunteer distributed computing network Einstein@Home. We find no significant signal candidate, and set the most constraining upper limits to date on the gravitational-wave emission from Cas A, which beat the indirect age-based upper limit across the entire search range. At around 170 Hz (the most","authors_text":"Badri Krishnan, Bernd Machenschalk, Bruce Allen, David Keitel, Heinz-Bernd Eggenstein, Karl Wette, Maria Alessandra Papa, Miroslav Shaltev, Oliver Bock, Reinhard Prix, Sylvia J. Zhu, Xavier Siemens","cross_cats":["astro-ph.HE","astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-08-26T20:10:15Z","title":"An Einstein@home search for continuous gravitational waves from Cassiopeia A"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.07589","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":"sha256:66b957d618477b733d351acb388b026e8d518f708335b0eec892abd4fb87e308","target":"record","created_at":"2026-05-18T01:00:41Z","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":"d43501c8000a520c353f3025c43c76b2c6f10e72f81b8092383f112b6c63f682","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-08-26T20:10:15Z","title_canon_sha256":"45c7a23e8d73fd35ac0aaaf7e2c9648b1198cf402de811c8c4dbb8f8ed62e875"},"schema_version":"1.0","source":{"id":"1608.07589","kind":"arxiv","version":2}},"canonical_sha256":"cd3e73d313aa72ee41137a5faf12ba5fe941c29a01a7090e7579ad57f603297a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd3e73d313aa72ee41137a5faf12ba5fe941c29a01a7090e7579ad57f603297a","first_computed_at":"2026-05-18T01:00:41.916187Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:00:41.916187Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QNUQFKZk1KNTrwhHzmU6XVzyjYSaoshbzT2FqO4xeSNb8CHXxcUj0tfehMm4fyOj2bw6/4ol6zEUZuIyMOcQCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:00:41.916593Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.07589","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:66b957d618477b733d351acb388b026e8d518f708335b0eec892abd4fb87e308","sha256:08799b539d060c2a654a192c1faaec8f7d448d3ee029ddf18c5b92c3ad2f1761"],"state_sha256":"5a75602de2705df546caca1f332029b654d44a7f66bdb89114da4a4007962e15"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YPc9NtwbEYVbGxAxfxpYkIhkLMI7n+e3BztFSnOwOLgl7aJBjjInjTYf0AkqRFaVLiFbFwK2X6KUpdcTpt2/Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T07:57:20.094370Z","bundle_sha256":"627df0f496c533aa002db0ff69ba6a35be366cb552bcfca47ce6c1caa45f6cdc"}}