{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:7P2UKOXSNCK3IJIDNI4LMLVNS3","short_pith_number":"pith:7P2UKOXS","canonical_record":{"source":{"id":"1305.4865","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-05-21T15:50:48Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"864f8450efdb6619cc2f89f205655840eb168701886a9eb10fdf39bc6927dc3c","abstract_canon_sha256":"1a77938f64997fc11529000553337607281808b084b519f57ffcf8b6d152a8e0"},"schema_version":"1.0"},"canonical_sha256":"fbf5453af26895b425036a38b62ead96cb64ee9b152fab9ed49b2c23fe5b8d09","source":{"kind":"arxiv","id":"1305.4865","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.4865","created_at":"2026-05-18T01:49:48Z"},{"alias_kind":"arxiv_version","alias_value":"1305.4865v1","created_at":"2026-05-18T01:49:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.4865","created_at":"2026-05-18T01:49:48Z"},{"alias_kind":"pith_short_12","alias_value":"7P2UKOXSNCK3","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"7P2UKOXSNCK3IJID","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"7P2UKOXS","created_at":"2026-05-18T12:27:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:7P2UKOXSNCK3IJIDNI4LMLVNS3","target":"record","payload":{"canonical_record":{"source":{"id":"1305.4865","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-05-21T15:50:48Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"864f8450efdb6619cc2f89f205655840eb168701886a9eb10fdf39bc6927dc3c","abstract_canon_sha256":"1a77938f64997fc11529000553337607281808b084b519f57ffcf8b6d152a8e0"},"schema_version":"1.0"},"canonical_sha256":"fbf5453af26895b425036a38b62ead96cb64ee9b152fab9ed49b2c23fe5b8d09","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:49:48.337694Z","signature_b64":"lU2B8ObggHun60Q9mMwdAjAtazrfJD+TKjGqf3flvO1fsY7HWpqx038reDxSBAh58tzOHzsgd9h6t0aybK4NDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fbf5453af26895b425036a38b62ead96cb64ee9b152fab9ed49b2c23fe5b8d09","last_reissued_at":"2026-05-18T01:49:48.336951Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:49:48.336951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1305.4865","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":"2026-05-18T01:49:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rq5BrGT8/d8y3Mu2wWmSjGVV3/hM6/MwNzBSu/SYOXl0+D2LyqMHiSUJ/bgMX7pYDNmeFH6/bGPiYJQvNT1iCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:38:31.983694Z"},"content_sha256":"ff5b183bed4bdb88913bce153248b8402b9040f17e6700525b90df567742e439","schema_version":"1.0","event_id":"sha256:ff5b183bed4bdb88913bce153248b8402b9040f17e6700525b90df567742e439"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:7P2UKOXSNCK3IJIDNI4LMLVNS3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"VLBI astrometry of PSR J2222-0137: a pulsar distance measured to 0.4% accuracy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.SR","authors_text":"A. T. Deller, D. R. Lorimer, I. H. Stairs, J. Boyles, K. Stovall, M. A. McLaughlin, S. Ransom, V. M. Kaspi","submitted_at":"2013-05-21T15:50:48Z","abstract_excerpt":"The binary pulsar J2222-0137 is an enigmatic system containing a partially recycled millisecond pulsar and a companion of unknown nature. Whilst the low eccentricity of the system favors a white dwarf companion, an unusual double neutron star system is also a possibility, and optical observations will be able to distinguish between these possibilities. In order to allow the absolute luminosity (or upper limit) of the companion object to be properly calibrated, we undertook astrometric observations with the Very Long Baseline Array to constrain the system distance via a measurement of annual ge"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.4865","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":"2026-05-18T01:49:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H3px2K4Uo58NrxrCNeolXFWBxLYzOeunMFY1q6dI1/egFabf/EyIJlTl6qo0TvFI8EueXtfFtKugHRHHMluiCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:38:31.984398Z"},"content_sha256":"6fc408dd3e70eb74f03ebe62dc907a0d2c2edd387f0e008609c39938eceef97e","schema_version":"1.0","event_id":"sha256:6fc408dd3e70eb74f03ebe62dc907a0d2c2edd387f0e008609c39938eceef97e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7P2UKOXSNCK3IJIDNI4LMLVNS3/bundle.json","state_url":"https://pith.science/pith/7P2UKOXSNCK3IJIDNI4LMLVNS3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7P2UKOXSNCK3IJIDNI4LMLVNS3/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":"2026-05-25T16:38:31Z","links":{"resolver":"https://pith.science/pith/7P2UKOXSNCK3IJIDNI4LMLVNS3","bundle":"https://pith.science/pith/7P2UKOXSNCK3IJIDNI4LMLVNS3/bundle.json","state":"https://pith.science/pith/7P2UKOXSNCK3IJIDNI4LMLVNS3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7P2UKOXSNCK3IJIDNI4LMLVNS3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:7P2UKOXSNCK3IJIDNI4LMLVNS3","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":"1a77938f64997fc11529000553337607281808b084b519f57ffcf8b6d152a8e0","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-05-21T15:50:48Z","title_canon_sha256":"864f8450efdb6619cc2f89f205655840eb168701886a9eb10fdf39bc6927dc3c"},"schema_version":"1.0","source":{"id":"1305.4865","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1305.4865","created_at":"2026-05-18T01:49:48Z"},{"alias_kind":"arxiv_version","alias_value":"1305.4865v1","created_at":"2026-05-18T01:49:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1305.4865","created_at":"2026-05-18T01:49:48Z"},{"alias_kind":"pith_short_12","alias_value":"7P2UKOXSNCK3","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"7P2UKOXSNCK3IJID","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"7P2UKOXS","created_at":"2026-05-18T12:27:36Z"}],"graph_snapshots":[{"event_id":"sha256:6fc408dd3e70eb74f03ebe62dc907a0d2c2edd387f0e008609c39938eceef97e","target":"graph","created_at":"2026-05-18T01:49:48Z","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":"The binary pulsar J2222-0137 is an enigmatic system containing a partially recycled millisecond pulsar and a companion of unknown nature. Whilst the low eccentricity of the system favors a white dwarf companion, an unusual double neutron star system is also a possibility, and optical observations will be able to distinguish between these possibilities. In order to allow the absolute luminosity (or upper limit) of the companion object to be properly calibrated, we undertook astrometric observations with the Very Long Baseline Array to constrain the system distance via a measurement of annual ge","authors_text":"A. T. Deller, D. R. Lorimer, I. H. Stairs, J. Boyles, K. Stovall, M. A. McLaughlin, S. Ransom, V. M. Kaspi","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-05-21T15:50:48Z","title":"VLBI astrometry of PSR J2222-0137: a pulsar distance measured to 0.4% accuracy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1305.4865","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:ff5b183bed4bdb88913bce153248b8402b9040f17e6700525b90df567742e439","target":"record","created_at":"2026-05-18T01:49:48Z","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":"1a77938f64997fc11529000553337607281808b084b519f57ffcf8b6d152a8e0","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2013-05-21T15:50:48Z","title_canon_sha256":"864f8450efdb6619cc2f89f205655840eb168701886a9eb10fdf39bc6927dc3c"},"schema_version":"1.0","source":{"id":"1305.4865","kind":"arxiv","version":1}},"canonical_sha256":"fbf5453af26895b425036a38b62ead96cb64ee9b152fab9ed49b2c23fe5b8d09","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fbf5453af26895b425036a38b62ead96cb64ee9b152fab9ed49b2c23fe5b8d09","first_computed_at":"2026-05-18T01:49:48.336951Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:49:48.336951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lU2B8ObggHun60Q9mMwdAjAtazrfJD+TKjGqf3flvO1fsY7HWpqx038reDxSBAh58tzOHzsgd9h6t0aybK4NDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:49:48.337694Z","signed_message":"canonical_sha256_bytes"},"source_id":"1305.4865","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ff5b183bed4bdb88913bce153248b8402b9040f17e6700525b90df567742e439","sha256:6fc408dd3e70eb74f03ebe62dc907a0d2c2edd387f0e008609c39938eceef97e"],"state_sha256":"2972fe52acaabf38dec801916d2784c2c090329f88660bc2b22e3af73557d1d1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sGHBSPDxzEtIkNvXqHyMqRpmEYq67GR3gcDmTi/GdAteafWuSy1WWZOrPsEepvzIZmyI+PE0UdrbWyBoN8yeDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T16:38:31.988187Z","bundle_sha256":"a1b65eb7e10ba17d75c28da1a5b6efae4ad514fea05b206f7413e5913f6c9be8"}}