{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:A3Y7OVQGMAIRL2N4O3UMWHZEDJ","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":"24197ac52ab528f1e7d1f218f9f0e12ec848d1c044518e3d08c83a356cd2eef6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-11-26T20:48:58Z","title_canon_sha256":"0fd53ab313f857dacd387f40093580bd49619bf9a1c27c80cf3a52b808b9f3ae"},"schema_version":"1.0","source":{"id":"1911.11829","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1911.11829","created_at":"2026-07-05T00:30:37Z"},{"alias_kind":"arxiv_version","alias_value":"1911.11829v1","created_at":"2026-07-05T00:30:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1911.11829","created_at":"2026-07-05T00:30:37Z"},{"alias_kind":"pith_short_12","alias_value":"A3Y7OVQGMAIR","created_at":"2026-07-05T00:30:37Z"},{"alias_kind":"pith_short_16","alias_value":"A3Y7OVQGMAIRL2N4","created_at":"2026-07-05T00:30:37Z"},{"alias_kind":"pith_short_8","alias_value":"A3Y7OVQG","created_at":"2026-07-05T00:30:37Z"}],"graph_snapshots":[{"event_id":"sha256:ad4522046e6279f42a59227c5bee645ad0747342d29506bb80efa80c5c4761ce","target":"graph","created_at":"2026-07-05T00:30:37Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1911.11829/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"CTB 87 (G74.9+1.2) is an evolved supernova remnant (SNR) which hosts a peculiar pulsar wind nebula (PWN). The X-ray peak is offset from that observed in radio and lies towards the edge of the radio nebula. The putative pulsar, CXOU~J201609.2+371110, was first resolved with \\textit{Chandra} and is surrounded by a compact and a more extended X-ray nebula. Here we use a deep {\\textit{XMM-Newton}} observation to examine the morphology and evolutionary stage of the PWN and to search for thermal emission expected from a supernova shell or reverse shock interaction with supernova ejecta. We do not fi","authors_text":"Austin MacMaster, Barbara Olmi, Benson Guest, Elena Amato, Niccolo Bucciantini, Roland Kothes, Samar Safi-Harb, Zaven Arzoumanian","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-11-26T20:48:58Z","title":"Deciphering the Nature of the Pulsar Wind Nebula CTB 87 with XMM-Newton"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1911.11829","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":"sha256:6d2a9dd452e8d27a6297a0050b9c3672c07e482a7928507c0545bd3dbc123cce","target":"record","created_at":"2026-07-05T00:30:37Z","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":"24197ac52ab528f1e7d1f218f9f0e12ec848d1c044518e3d08c83a356cd2eef6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-11-26T20:48:58Z","title_canon_sha256":"0fd53ab313f857dacd387f40093580bd49619bf9a1c27c80cf3a52b808b9f3ae"},"schema_version":"1.0","source":{"id":"1911.11829","kind":"arxiv","version":1}},"canonical_sha256":"06f1f75606601115e9bc76e8cb1f241a632a187a4a22669708ee69f13d6c8249","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"06f1f75606601115e9bc76e8cb1f241a632a187a4a22669708ee69f13d6c8249","first_computed_at":"2026-07-05T00:30:37.690606Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:30:37.690606Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rDDivnf8dGDHNyvjv2HxHzu+ajcGrgNsv3F8imPSq8n41XonwtsdF4A2ju9YgEU8I8cVAqW6oy9x5nbOhKrwAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T00:30:37.690965Z","signed_message":"canonical_sha256_bytes"},"source_id":"1911.11829","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6d2a9dd452e8d27a6297a0050b9c3672c07e482a7928507c0545bd3dbc123cce","sha256:ad4522046e6279f42a59227c5bee645ad0747342d29506bb80efa80c5c4761ce"],"state_sha256":"1bc46247470ed016cf899e78c679d6429ae4872af147a2f5714808ae88f0e574"}