{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:ZWVRJNQP3SKOSU4EL46IX4MCMJ","short_pith_number":"pith:ZWVRJNQP","canonical_record":{"source":{"id":"1212.5026","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-12-20T13:20:41Z","cross_cats_sorted":[],"title_canon_sha256":"f0a2d73e3de9fc76bd668728026a3d14d1189f16323950e333ba17299d0c1173","abstract_canon_sha256":"0bb6235a633345424b2c1dbf507ed470cb8914b2f48c787df8d222b433411016"},"schema_version":"1.0"},"canonical_sha256":"cdab14b60fdc94e953845f3c8bf1826246faefd3ca1051932f57a7a1541183cf","source":{"kind":"arxiv","id":"1212.5026","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.5026","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"arxiv_version","alias_value":"1212.5026v2","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.5026","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"pith_short_12","alias_value":"ZWVRJNQP3SKO","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"ZWVRJNQP3SKOSU4E","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"ZWVRJNQP","created_at":"2026-05-18T12:27:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:ZWVRJNQP3SKOSU4EL46IX4MCMJ","target":"record","payload":{"canonical_record":{"source":{"id":"1212.5026","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-12-20T13:20:41Z","cross_cats_sorted":[],"title_canon_sha256":"f0a2d73e3de9fc76bd668728026a3d14d1189f16323950e333ba17299d0c1173","abstract_canon_sha256":"0bb6235a633345424b2c1dbf507ed470cb8914b2f48c787df8d222b433411016"},"schema_version":"1.0"},"canonical_sha256":"cdab14b60fdc94e953845f3c8bf1826246faefd3ca1051932f57a7a1541183cf","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:52:29.894880Z","signature_b64":"sRpFWq9FCAY5QxGNuALbyNiHpHuB/U2G/9lClmkyq8YT/vOK2e8PlNSldDPEaPxxizSGSJlzXr40ws9B6pYuBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cdab14b60fdc94e953845f3c8bf1826246faefd3ca1051932f57a7a1541183cf","last_reissued_at":"2026-05-18T01:52:29.894212Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:52:29.894212Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1212.5026","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":"2026-05-18T01:52:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wveRuNkl0v7NW/i7woVqCtqwJgro2PgYn1gWlcFtkJSRarXZmvUelkgBwgR3DbqZiterz1tduFsx6KDEDNQwCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T20:35:44.539041Z"},"content_sha256":"a98fdb59f359425f13983b09b71ad963723d899a4a3c017d1a73bf454500cf93","schema_version":"1.0","event_id":"sha256:a98fdb59f359425f13983b09b71ad963723d899a4a3c017d1a73bf454500cf93"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:ZWVRJNQP3SKOSU4EL46IX4MCMJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Thomson Scattering and Collisional Ionization in the X-rays Grating Spectra of the Recurrent Nova U Scorpii","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. Bianchini, E. Behar, E.Chiosi, G. J. M. Luna, J. Gallagher, M. Orio","submitted_at":"2012-12-20T13:20:41Z","abstract_excerpt":"We present a Chandra observation of the recurrent nova U Scorpii, done with the HRC-S detector and the LETG grating on day 18 after the observed visual maximum of 2010, and compare it with XMM-Newton observations obtained in days 23 and 35 after maximum. The total absorbed flux was in the range 2.2-2.6 x 10^(-11) erg cm^(-2) s^(-1), corresponding to unabsorbed luminosity 7-8.5 x 10^(36)x(d/12 kpc)^2 for N(H)=2-2.7x10^(21) cm^(-2). On day 18, 70% of the soft X-tray flux was in a continuum typical of a very hot white dwarf (WD) atmosphere, which accounted for about 80% of the flux on days 23 and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.5026","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":"2026-05-18T01:52:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OwPUa8Kw9fHUjtKBe8VsvrzgkPywsxfN+w9Cf4A/5qbEYe5RqBXc+Rsw8cuUkE9KrQkSWzpBD6Q3GHNa4mzmDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T20:35:44.539412Z"},"content_sha256":"b5de1b8cd07c32b12d89e4e8a488b788405bbf8206c01eb7c8071f459cbc4647","schema_version":"1.0","event_id":"sha256:b5de1b8cd07c32b12d89e4e8a488b788405bbf8206c01eb7c8071f459cbc4647"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZWVRJNQP3SKOSU4EL46IX4MCMJ/bundle.json","state_url":"https://pith.science/pith/ZWVRJNQP3SKOSU4EL46IX4MCMJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZWVRJNQP3SKOSU4EL46IX4MCMJ/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":"2026-06-02T20:35:44Z","links":{"resolver":"https://pith.science/pith/ZWVRJNQP3SKOSU4EL46IX4MCMJ","bundle":"https://pith.science/pith/ZWVRJNQP3SKOSU4EL46IX4MCMJ/bundle.json","state":"https://pith.science/pith/ZWVRJNQP3SKOSU4EL46IX4MCMJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZWVRJNQP3SKOSU4EL46IX4MCMJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:ZWVRJNQP3SKOSU4EL46IX4MCMJ","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":"0bb6235a633345424b2c1dbf507ed470cb8914b2f48c787df8d222b433411016","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-12-20T13:20:41Z","title_canon_sha256":"f0a2d73e3de9fc76bd668728026a3d14d1189f16323950e333ba17299d0c1173"},"schema_version":"1.0","source":{"id":"1212.5026","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.5026","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"arxiv_version","alias_value":"1212.5026v2","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.5026","created_at":"2026-05-18T01:52:29Z"},{"alias_kind":"pith_short_12","alias_value":"ZWVRJNQP3SKO","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_16","alias_value":"ZWVRJNQP3SKOSU4E","created_at":"2026-05-18T12:27:30Z"},{"alias_kind":"pith_short_8","alias_value":"ZWVRJNQP","created_at":"2026-05-18T12:27:30Z"}],"graph_snapshots":[{"event_id":"sha256:b5de1b8cd07c32b12d89e4e8a488b788405bbf8206c01eb7c8071f459cbc4647","target":"graph","created_at":"2026-05-18T01:52:29Z","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":"We present a Chandra observation of the recurrent nova U Scorpii, done with the HRC-S detector and the LETG grating on day 18 after the observed visual maximum of 2010, and compare it with XMM-Newton observations obtained in days 23 and 35 after maximum. The total absorbed flux was in the range 2.2-2.6 x 10^(-11) erg cm^(-2) s^(-1), corresponding to unabsorbed luminosity 7-8.5 x 10^(36)x(d/12 kpc)^2 for N(H)=2-2.7x10^(21) cm^(-2). On day 18, 70% of the soft X-tray flux was in a continuum typical of a very hot white dwarf (WD) atmosphere, which accounted for about 80% of the flux on days 23 and","authors_text":"A. Bianchini, E. Behar, E.Chiosi, G. J. M. Luna, J. Gallagher, M. Orio","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-12-20T13:20:41Z","title":"Thomson Scattering and Collisional Ionization in the X-rays Grating Spectra of the Recurrent Nova U Scorpii"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.5026","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:a98fdb59f359425f13983b09b71ad963723d899a4a3c017d1a73bf454500cf93","target":"record","created_at":"2026-05-18T01:52:29Z","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":"0bb6235a633345424b2c1dbf507ed470cb8914b2f48c787df8d222b433411016","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-12-20T13:20:41Z","title_canon_sha256":"f0a2d73e3de9fc76bd668728026a3d14d1189f16323950e333ba17299d0c1173"},"schema_version":"1.0","source":{"id":"1212.5026","kind":"arxiv","version":2}},"canonical_sha256":"cdab14b60fdc94e953845f3c8bf1826246faefd3ca1051932f57a7a1541183cf","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cdab14b60fdc94e953845f3c8bf1826246faefd3ca1051932f57a7a1541183cf","first_computed_at":"2026-05-18T01:52:29.894212Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:52:29.894212Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sRpFWq9FCAY5QxGNuALbyNiHpHuB/U2G/9lClmkyq8YT/vOK2e8PlNSldDPEaPxxizSGSJlzXr40ws9B6pYuBw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:52:29.894880Z","signed_message":"canonical_sha256_bytes"},"source_id":"1212.5026","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a98fdb59f359425f13983b09b71ad963723d899a4a3c017d1a73bf454500cf93","sha256:b5de1b8cd07c32b12d89e4e8a488b788405bbf8206c01eb7c8071f459cbc4647"],"state_sha256":"b67b66c49965aa1c0c497c06545bf19ea99784013504eaa06f9d5228c54c053b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WpzqNU0dwviEO7VTXHE99TXZjtoJttAi4mmidndYQeh9ybTkvWtTpUdQXiR4bjEjChK1pLtmqrwWEg7JvDXEAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T20:35:44.541392Z","bundle_sha256":"d9aa68948d0c5b1849b498149c0dfb5d93e1f7ceb004d4124a4a035301bc02c6"}}