{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:2DJCAEB4AJDNZAYMUQ3KSIAXZD","short_pith_number":"pith:2DJCAEB4","canonical_record":{"source":{"id":"1902.00356","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-23T19:00:12Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"title_canon_sha256":"54c66826050ef98d1d2aa0a0e7e9e58aed23f1382a9fae0ce3124c0a94892298","abstract_canon_sha256":"05dd83d7cf33c2474495d749be4be1b984878391eec5cad9e5d09d7619617d61"},"schema_version":"1.0"},"canonical_sha256":"d0d220103c0246dc830ca436a92017c8e2f07104af361c6c0bb4ca940324d7ec","source":{"kind":"arxiv","id":"1902.00356","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.00356","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"arxiv_version","alias_value":"1902.00356v1","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.00356","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"pith_short_12","alias_value":"2DJCAEB4AJDN","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"2DJCAEB4AJDNZAYM","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"2DJCAEB4","created_at":"2026-05-18T12:33:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:2DJCAEB4AJDNZAYMUQ3KSIAXZD","target":"record","payload":{"canonical_record":{"source":{"id":"1902.00356","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-23T19:00:12Z","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"title_canon_sha256":"54c66826050ef98d1d2aa0a0e7e9e58aed23f1382a9fae0ce3124c0a94892298","abstract_canon_sha256":"05dd83d7cf33c2474495d749be4be1b984878391eec5cad9e5d09d7619617d61"},"schema_version":"1.0"},"canonical_sha256":"d0d220103c0246dc830ca436a92017c8e2f07104af361c6c0bb4ca940324d7ec","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:51:30.062106Z","signature_b64":"7XbaU5z9NbuQ0wBhCGDq2ljQpfTo6anNE/4v1Xp5cAV1IK9DTwlwiHGbxiFG9N5VlRBqHBlsQ48Le2Iw2rSTCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d0d220103c0246dc830ca436a92017c8e2f07104af361c6c0bb4ca940324d7ec","last_reissued_at":"2026-05-17T23:51:30.061670Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:51:30.061670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.00356","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":"2026-05-17T23:51:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2zgrhJIbI6xb3kDNRPIn/n6wMg4txsaw1EIJGFvNu2Jg1Ib96xArS3IpLHFSms6JsQ0Io4Rn9/AlhYhnVvQ/AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T15:30:19.872838Z"},"content_sha256":"baf1b71684e014f9635904462faec1e439796a26bd9a5e6d727740d55f80da25","schema_version":"1.0","event_id":"sha256:baf1b71684e014f9635904462faec1e439796a26bd9a5e6d727740d55f80da25"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:2DJCAEB4AJDNZAYMUQ3KSIAXZD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A LOFAR search for steep-spectrum pulsars in Supernova Remnants and Pulsar Wind Nebulae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Joeri van Leeuwen, Samayra Straal","submitted_at":"2019-01-23T19:00:12Z","abstract_excerpt":"Pinpointing a pulsar in its parent supernova remnant (SNR) or resulting pulsar wind nebula (PWN) is key for understanding its formation history, and the pulsar wind mechanism. Yet, only about half the SNRs and PWNe appear associated with a pulsar. We aim to find the pulsars in a sample of eight known and new SNRs and PWNe. Using the LOFAR radio telescope at 150 MHz, each source was observed for 3 hours. We covered the entire remnants where needed, by employing many tied-array beams to tile out even the largest objects. For objects with a confirmed point source or PWN we constrained our search "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.00356","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":"2026-05-17T23:51:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rB9Ohp2XFr6HQ5CT3cEJ3uY8y/pHpjjZLafQKuW6sqfewNhV387SsUkMgFzpH+bywabM5bD9XlaoTIGhHKefDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T15:30:19.873325Z"},"content_sha256":"95c6f6495323ae698501151d9611082cfd4e2c374c4f6b64e12487538e9ca082","schema_version":"1.0","event_id":"sha256:95c6f6495323ae698501151d9611082cfd4e2c374c4f6b64e12487538e9ca082"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2DJCAEB4AJDNZAYMUQ3KSIAXZD/bundle.json","state_url":"https://pith.science/pith/2DJCAEB4AJDNZAYMUQ3KSIAXZD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2DJCAEB4AJDNZAYMUQ3KSIAXZD/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":"2026-08-06T15:30:19Z","links":{"resolver":"https://pith.science/pith/2DJCAEB4AJDNZAYMUQ3KSIAXZD","bundle":"https://pith.science/pith/2DJCAEB4AJDNZAYMUQ3KSIAXZD/bundle.json","state":"https://pith.science/pith/2DJCAEB4AJDNZAYMUQ3KSIAXZD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2DJCAEB4AJDNZAYMUQ3KSIAXZD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:2DJCAEB4AJDNZAYMUQ3KSIAXZD","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":"05dd83d7cf33c2474495d749be4be1b984878391eec5cad9e5d09d7619617d61","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-23T19:00:12Z","title_canon_sha256":"54c66826050ef98d1d2aa0a0e7e9e58aed23f1382a9fae0ce3124c0a94892298"},"schema_version":"1.0","source":{"id":"1902.00356","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.00356","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"arxiv_version","alias_value":"1902.00356v1","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.00356","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"pith_short_12","alias_value":"2DJCAEB4AJDN","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"2DJCAEB4AJDNZAYM","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"2DJCAEB4","created_at":"2026-05-18T12:33:07Z"}],"graph_snapshots":[{"event_id":"sha256:95c6f6495323ae698501151d9611082cfd4e2c374c4f6b64e12487538e9ca082","target":"graph","created_at":"2026-05-17T23:51:30Z","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":"Pinpointing a pulsar in its parent supernova remnant (SNR) or resulting pulsar wind nebula (PWN) is key for understanding its formation history, and the pulsar wind mechanism. Yet, only about half the SNRs and PWNe appear associated with a pulsar. We aim to find the pulsars in a sample of eight known and new SNRs and PWNe. Using the LOFAR radio telescope at 150 MHz, each source was observed for 3 hours. We covered the entire remnants where needed, by employing many tied-array beams to tile out even the largest objects. For objects with a confirmed point source or PWN we constrained our search ","authors_text":"Joeri van Leeuwen, Samayra Straal","cross_cats":["astro-ph.IM","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-23T19:00:12Z","title":"A LOFAR search for steep-spectrum pulsars in Supernova Remnants and Pulsar Wind Nebulae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.00356","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:baf1b71684e014f9635904462faec1e439796a26bd9a5e6d727740d55f80da25","target":"record","created_at":"2026-05-17T23:51:30Z","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":"05dd83d7cf33c2474495d749be4be1b984878391eec5cad9e5d09d7619617d61","cross_cats_sorted":["astro-ph.IM","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-01-23T19:00:12Z","title_canon_sha256":"54c66826050ef98d1d2aa0a0e7e9e58aed23f1382a9fae0ce3124c0a94892298"},"schema_version":"1.0","source":{"id":"1902.00356","kind":"arxiv","version":1}},"canonical_sha256":"d0d220103c0246dc830ca436a92017c8e2f07104af361c6c0bb4ca940324d7ec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d0d220103c0246dc830ca436a92017c8e2f07104af361c6c0bb4ca940324d7ec","first_computed_at":"2026-05-17T23:51:30.061670Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:30.061670Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7XbaU5z9NbuQ0wBhCGDq2ljQpfTo6anNE/4v1Xp5cAV1IK9DTwlwiHGbxiFG9N5VlRBqHBlsQ48Le2Iw2rSTCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:30.062106Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.00356","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:baf1b71684e014f9635904462faec1e439796a26bd9a5e6d727740d55f80da25","sha256:95c6f6495323ae698501151d9611082cfd4e2c374c4f6b64e12487538e9ca082"],"state_sha256":"716da64c84f21d26e64a354981ac7817ad2645d347f1eb120ec9eeb48ac417b6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TfVWXA6e6NIrU3l13n95FJFjrtCRFyQr5K5B0XFtG93dG139Yh2qAtjb+tUehpR0jPlmKsfbQrb73dUXx//1CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T15:30:19.876858Z","bundle_sha256":"ac8c3cf2ea620da30da6c4e6bdc344ecf695546c9a78fc12b59f307f33d2ae80"}}