{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:OPKFWW4WR5VMBODLJC2AF3XKCO","short_pith_number":"pith:OPKFWW4W","canonical_record":{"source":{"id":"1609.07375","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-23T14:21:17Z","cross_cats_sorted":[],"title_canon_sha256":"964836cede31d9d868e095f5c68a8e2c3e88fcb0d315f5293d4ed67aade3cad4","abstract_canon_sha256":"8e35b02eeaa614447b0a81e9e9658a8f9e3b51e9e518e867e2861967988bcf1e"},"schema_version":"1.0"},"canonical_sha256":"73d45b5b968f6ac0b86b48b402eeea13912cfbd0a533be73a7a214edbd273f76","source":{"kind":"arxiv","id":"1609.07375","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.07375","created_at":"2026-05-18T00:49:58Z"},{"alias_kind":"arxiv_version","alias_value":"1609.07375v2","created_at":"2026-05-18T00:49:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.07375","created_at":"2026-05-18T00:49:58Z"},{"alias_kind":"pith_short_12","alias_value":"OPKFWW4WR5VM","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OPKFWW4WR5VMBODL","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OPKFWW4W","created_at":"2026-05-18T12:30:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:OPKFWW4WR5VMBODLJC2AF3XKCO","target":"record","payload":{"canonical_record":{"source":{"id":"1609.07375","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-23T14:21:17Z","cross_cats_sorted":[],"title_canon_sha256":"964836cede31d9d868e095f5c68a8e2c3e88fcb0d315f5293d4ed67aade3cad4","abstract_canon_sha256":"8e35b02eeaa614447b0a81e9e9658a8f9e3b51e9e518e867e2861967988bcf1e"},"schema_version":"1.0"},"canonical_sha256":"73d45b5b968f6ac0b86b48b402eeea13912cfbd0a533be73a7a214edbd273f76","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:49:58.407812Z","signature_b64":"ENegQyrQlzA5LCMdGqeORSGsGF3XkSU84lnH/5HgVYwuDkqoHie7pHUPmyUoVxkJKoQRBAZyY/vTjq4WmFJwAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"73d45b5b968f6ac0b86b48b402eeea13912cfbd0a533be73a7a214edbd273f76","last_reissued_at":"2026-05-18T00:49:58.407077Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:49:58.407077Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.07375","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":"2026-05-18T00:49:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NCMrI41S3AvT8c2p3C/cKxbqskwv1GSXGBYbKxJkro83432w2xZ8tq34+v5JDtaGSypN1sR0g26ctKyZVjHRDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T10:03:47.792354Z"},"content_sha256":"1578fe690ef200cc12a93b336609ad247966698af18b54fc5ea1128e205f172e","schema_version":"1.0","event_id":"sha256:1578fe690ef200cc12a93b336609ad247966698af18b54fc5ea1128e205f172e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:OPKFWW4WR5VMBODLJC2AF3XKCO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Belfiore, A. De Luca, A. Papitto, A. Tiengo, A. Wolter, D. D'Agostino, D. Salvetti, F. Haberl, G. A. Rodriguez Castillo, G. L. Israel, G. Novara, J. Greiner, J. Wilms, L. Stella, L. Zampieri, M. Marelli, M. Perri, M. Watson, P. Casella, P. Esposito, R. Salvaterra, R. Turolla, S. Puccetti","submitted_at":"2016-09-23T14:21:17Z","abstract_excerpt":"Ultraluminous x-ray sources (ULXs) in nearby galaxies shine brighter than any X-ray source in our Galaxy. ULXs are usually modeled as stellar-mass black holes (BHs) accreting at very high rates or intermediate-mass BHs. We present observations showing that NGC5907 ULX is instead an x-ray accreting neutron star (NS) with a spin period evolving from 1.43~s in 2003 to 1.13~s in 2014. It has an isotropic peak luminosity of about 1000 times the Eddington limit for a NS at 17.1~Mpc. Standard accretion models fail to explain its luminosity, even assuming beamed emission, but a strong multipolar magne"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.07375","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":"2026-05-18T00:49:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mlZtNawC3MzP6HB3u64P1A3kWFTIan8GWNqioOpADZsWJh2h6b1yRGuYTVDmSibjxqGiy7OcG7j0Z3o1d6wPAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T10:03:47.793020Z"},"content_sha256":"35e7b3a79086e150c8db28a60e8cfc95a1b9c844a1c82271cf817d2b083cbcc7","schema_version":"1.0","event_id":"sha256:35e7b3a79086e150c8db28a60e8cfc95a1b9c844a1c82271cf817d2b083cbcc7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OPKFWW4WR5VMBODLJC2AF3XKCO/bundle.json","state_url":"https://pith.science/pith/OPKFWW4WR5VMBODLJC2AF3XKCO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OPKFWW4WR5VMBODLJC2AF3XKCO/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":"2026-05-25T10:03:47Z","links":{"resolver":"https://pith.science/pith/OPKFWW4WR5VMBODLJC2AF3XKCO","bundle":"https://pith.science/pith/OPKFWW4WR5VMBODLJC2AF3XKCO/bundle.json","state":"https://pith.science/pith/OPKFWW4WR5VMBODLJC2AF3XKCO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OPKFWW4WR5VMBODLJC2AF3XKCO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:OPKFWW4WR5VMBODLJC2AF3XKCO","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":"8e35b02eeaa614447b0a81e9e9658a8f9e3b51e9e518e867e2861967988bcf1e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-23T14:21:17Z","title_canon_sha256":"964836cede31d9d868e095f5c68a8e2c3e88fcb0d315f5293d4ed67aade3cad4"},"schema_version":"1.0","source":{"id":"1609.07375","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.07375","created_at":"2026-05-18T00:49:58Z"},{"alias_kind":"arxiv_version","alias_value":"1609.07375v2","created_at":"2026-05-18T00:49:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.07375","created_at":"2026-05-18T00:49:58Z"},{"alias_kind":"pith_short_12","alias_value":"OPKFWW4WR5VM","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"OPKFWW4WR5VMBODL","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"OPKFWW4W","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:35e7b3a79086e150c8db28a60e8cfc95a1b9c844a1c82271cf817d2b083cbcc7","target":"graph","created_at":"2026-05-18T00:49:58Z","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":"Ultraluminous x-ray sources (ULXs) in nearby galaxies shine brighter than any X-ray source in our Galaxy. ULXs are usually modeled as stellar-mass black holes (BHs) accreting at very high rates or intermediate-mass BHs. We present observations showing that NGC5907 ULX is instead an x-ray accreting neutron star (NS) with a spin period evolving from 1.43~s in 2003 to 1.13~s in 2014. It has an isotropic peak luminosity of about 1000 times the Eddington limit for a NS at 17.1~Mpc. Standard accretion models fail to explain its luminosity, even assuming beamed emission, but a strong multipolar magne","authors_text":"A. Belfiore, A. De Luca, A. Papitto, A. Tiengo, A. Wolter, D. D'Agostino, D. Salvetti, F. Haberl, G. A. Rodriguez Castillo, G. L. Israel, G. Novara, J. Greiner, J. Wilms, L. Stella, L. Zampieri, M. Marelli, M. Perri, M. Watson, P. Casella, P. Esposito, R. Salvaterra, R. Turolla, S. Puccetti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-23T14:21:17Z","title":"An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.07375","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":"sha256:1578fe690ef200cc12a93b336609ad247966698af18b54fc5ea1128e205f172e","target":"record","created_at":"2026-05-18T00:49:58Z","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":"8e35b02eeaa614447b0a81e9e9658a8f9e3b51e9e518e867e2861967988bcf1e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-09-23T14:21:17Z","title_canon_sha256":"964836cede31d9d868e095f5c68a8e2c3e88fcb0d315f5293d4ed67aade3cad4"},"schema_version":"1.0","source":{"id":"1609.07375","kind":"arxiv","version":2}},"canonical_sha256":"73d45b5b968f6ac0b86b48b402eeea13912cfbd0a533be73a7a214edbd273f76","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"73d45b5b968f6ac0b86b48b402eeea13912cfbd0a533be73a7a214edbd273f76","first_computed_at":"2026-05-18T00:49:58.407077Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:49:58.407077Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ENegQyrQlzA5LCMdGqeORSGsGF3XkSU84lnH/5HgVYwuDkqoHie7pHUPmyUoVxkJKoQRBAZyY/vTjq4WmFJwAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:49:58.407812Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.07375","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1578fe690ef200cc12a93b336609ad247966698af18b54fc5ea1128e205f172e","sha256:35e7b3a79086e150c8db28a60e8cfc95a1b9c844a1c82271cf817d2b083cbcc7"],"state_sha256":"18422acf06bce02ddc74763edf981fb9c21493c6799db8147651731d91ef5603"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p8IuDrTxMkNnwUxsYUqERXs3AqLEnmj4xc9NFMjhX5M8wZqtBKfPXru1Qo4esbAsqwyVwYpcuVdARkiwftvSCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T10:03:47.796828Z","bundle_sha256":"423171a041fbc0758b305e206eac0161ad21096564b60c5e000cc79f997c32b6"}}