{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:WMORRNNAWF756SSB2KB2ZVOHMG","short_pith_number":"pith:WMORRNNA","canonical_record":{"source":{"id":"0904.4776","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-04-30T09:54:36Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"fa2b5faf84ca4ca8f741cc766e1d433ff25f89639885601c7e852a5bce035fb7","abstract_canon_sha256":"8bb646e95e80f5b7c89976fedf2b4c78d924c6b7b98a7a0bd3651fa3ed874de8"},"schema_version":"1.0"},"canonical_sha256":"b31d18b5a0b17fdf4a41d283acd5c761a4dfaa3f1f1f09781591c2e4a3f2e43e","source":{"kind":"arxiv","id":"0904.4776","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.4776","created_at":"2026-05-18T02:13:48Z"},{"alias_kind":"arxiv_version","alias_value":"0904.4776v1","created_at":"2026-05-18T02:13:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.4776","created_at":"2026-05-18T02:13:48Z"},{"alias_kind":"pith_short_12","alias_value":"WMORRNNAWF75","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"WMORRNNAWF756SSB","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"WMORRNNA","created_at":"2026-05-18T12:26:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:WMORRNNAWF756SSB2KB2ZVOHMG","target":"record","payload":{"canonical_record":{"source":{"id":"0904.4776","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-04-30T09:54:36Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"fa2b5faf84ca4ca8f741cc766e1d433ff25f89639885601c7e852a5bce035fb7","abstract_canon_sha256":"8bb646e95e80f5b7c89976fedf2b4c78d924c6b7b98a7a0bd3651fa3ed874de8"},"schema_version":"1.0"},"canonical_sha256":"b31d18b5a0b17fdf4a41d283acd5c761a4dfaa3f1f1f09781591c2e4a3f2e43e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:48.934995Z","signature_b64":"nQXRcuPn5dkFP/PJNeVQYz09qbWtLihlfqcu54znBZoY9Xxe9KmxvMnYUiDk62WnYgYjjtPu6d0f0dx2eoiWBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b31d18b5a0b17fdf4a41d283acd5c761a4dfaa3f1f1f09781591c2e4a3f2e43e","last_reissued_at":"2026-05-18T02:13:48.934285Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:48.934285Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0904.4776","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":"2026-05-18T02:13:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cMBFrW3AN+xCDpc9ILuWEywUVRtEN7If3fCnkPHPBt9lMhpBVBDKHIdOqLUB/UmbnWOU9KdhhwJjt/z4CyTFBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:12:13.492082Z"},"content_sha256":"e8a18bd68045486c49c9e37467f699111e82e9f27a03b453b5a26d76bd079404","schema_version":"1.0","event_id":"sha256:e8a18bd68045486c49c9e37467f699111e82e9f27a03b453b5a26d76bd079404"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:WMORRNNAWF756SSB2KB2ZVOHMG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Deep optical observations of the central X-ray source in the Puppis A supernova remnant","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"A. De Luca, P.A. Caraveo (INAF-Iasf), R. P. Mignani (MSSL-UCL), S. Mereghetti","submitted_at":"2009-04-30T09:54:36Z","abstract_excerpt":"X-ray observations reveiled a group of radio-silent isolated neutron stars (INSs) at the centre of young supernova remnants (SNRs), dubbed central compact objects or CCOs, with properties different from those of classical rotation-powered pulsars. In at least three cases, evidence points towards CCOs being low-magnetized INSs, born with slow rotation periods, and possibly accreting from a debris disc of material formed out of the supernova event. Understanding the origin of the diversity of the CCOs can shed light on supernova explosion and neutron star formation models. Optical/infrared (IR) "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.4776","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":"2026-05-18T02:13:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cPh3Azm/t0n2PuQVtxRypty6r9VK0aRs/gxCWppQGTVimWIz+ygzo44C06TS1s+P0I4+05AijMWw1rHMurjaDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:12:13.492511Z"},"content_sha256":"2f1d77e64181be03e9d364efd4e0ea44dac8393f64ddfdc2878f8ba4ea5b590e","schema_version":"1.0","event_id":"sha256:2f1d77e64181be03e9d364efd4e0ea44dac8393f64ddfdc2878f8ba4ea5b590e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WMORRNNAWF756SSB2KB2ZVOHMG/bundle.json","state_url":"https://pith.science/pith/WMORRNNAWF756SSB2KB2ZVOHMG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WMORRNNAWF756SSB2KB2ZVOHMG/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":"2026-05-25T17:12:13Z","links":{"resolver":"https://pith.science/pith/WMORRNNAWF756SSB2KB2ZVOHMG","bundle":"https://pith.science/pith/WMORRNNAWF756SSB2KB2ZVOHMG/bundle.json","state":"https://pith.science/pith/WMORRNNAWF756SSB2KB2ZVOHMG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WMORRNNAWF756SSB2KB2ZVOHMG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:WMORRNNAWF756SSB2KB2ZVOHMG","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":"8bb646e95e80f5b7c89976fedf2b4c78d924c6b7b98a7a0bd3651fa3ed874de8","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-04-30T09:54:36Z","title_canon_sha256":"fa2b5faf84ca4ca8f741cc766e1d433ff25f89639885601c7e852a5bce035fb7"},"schema_version":"1.0","source":{"id":"0904.4776","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0904.4776","created_at":"2026-05-18T02:13:48Z"},{"alias_kind":"arxiv_version","alias_value":"0904.4776v1","created_at":"2026-05-18T02:13:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0904.4776","created_at":"2026-05-18T02:13:48Z"},{"alias_kind":"pith_short_12","alias_value":"WMORRNNAWF75","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_16","alias_value":"WMORRNNAWF756SSB","created_at":"2026-05-18T12:26:02Z"},{"alias_kind":"pith_short_8","alias_value":"WMORRNNA","created_at":"2026-05-18T12:26:02Z"}],"graph_snapshots":[{"event_id":"sha256:2f1d77e64181be03e9d364efd4e0ea44dac8393f64ddfdc2878f8ba4ea5b590e","target":"graph","created_at":"2026-05-18T02:13:48Z","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":"X-ray observations reveiled a group of radio-silent isolated neutron stars (INSs) at the centre of young supernova remnants (SNRs), dubbed central compact objects or CCOs, with properties different from those of classical rotation-powered pulsars. In at least three cases, evidence points towards CCOs being low-magnetized INSs, born with slow rotation periods, and possibly accreting from a debris disc of material formed out of the supernova event. Understanding the origin of the diversity of the CCOs can shed light on supernova explosion and neutron star formation models. Optical/infrared (IR) ","authors_text":"A. De Luca, P.A. Caraveo (INAF-Iasf), R. P. Mignani (MSSL-UCL), S. Mereghetti","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-04-30T09:54:36Z","title":"Deep optical observations of the central X-ray source in the Puppis A supernova remnant"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0904.4776","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:e8a18bd68045486c49c9e37467f699111e82e9f27a03b453b5a26d76bd079404","target":"record","created_at":"2026-05-18T02:13:48Z","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":"8bb646e95e80f5b7c89976fedf2b4c78d924c6b7b98a7a0bd3651fa3ed874de8","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-04-30T09:54:36Z","title_canon_sha256":"fa2b5faf84ca4ca8f741cc766e1d433ff25f89639885601c7e852a5bce035fb7"},"schema_version":"1.0","source":{"id":"0904.4776","kind":"arxiv","version":1}},"canonical_sha256":"b31d18b5a0b17fdf4a41d283acd5c761a4dfaa3f1f1f09781591c2e4a3f2e43e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b31d18b5a0b17fdf4a41d283acd5c761a4dfaa3f1f1f09781591c2e4a3f2e43e","first_computed_at":"2026-05-18T02:13:48.934285Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:48.934285Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nQXRcuPn5dkFP/PJNeVQYz09qbWtLihlfqcu54znBZoY9Xxe9KmxvMnYUiDk62WnYgYjjtPu6d0f0dx2eoiWBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:48.934995Z","signed_message":"canonical_sha256_bytes"},"source_id":"0904.4776","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e8a18bd68045486c49c9e37467f699111e82e9f27a03b453b5a26d76bd079404","sha256:2f1d77e64181be03e9d364efd4e0ea44dac8393f64ddfdc2878f8ba4ea5b590e"],"state_sha256":"3d5cf1089a469ef3e2a75f1cece942f40e5cf23325573b05c9eef01114ae12d3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oTZkrPUG6OtvMFLlhGsjADCHhH2TRahzI0kaC8i3h7pvBGzpOmzP0nAnxWxsLL385HAjxTtFgrrF83YBOQCACg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T17:12:13.495149Z","bundle_sha256":"d6a6ddbcae0784cb8f17325c5e1c5b1b7e56e02fe2cebadd88465707cb9b3197"}}