{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:YUUVQPOTDE2QCT2JN3PKXH4TCP","short_pith_number":"pith:YUUVQPOT","canonical_record":{"source":{"id":"1802.07732","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T19:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"13bf30b81e04b3251767e07f740b9f6eb973a07f3c7dde393478b153e3ba2fc2","abstract_canon_sha256":"8e381aae07c290dfc290953ce45ee47dc51ace0ecce8ce15b47fc5e90df13120"},"schema_version":"1.0"},"canonical_sha256":"c529583dd31935014f496edeab9f9313e19e4dbbafdab518dd8e29d81127cb5c","source":{"kind":"arxiv","id":"1802.07732","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07732","created_at":"2026-05-18T00:10:38Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07732v2","created_at":"2026-05-18T00:10:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07732","created_at":"2026-05-18T00:10:38Z"},{"alias_kind":"pith_short_12","alias_value":"YUUVQPOTDE2Q","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YUUVQPOTDE2QCT2J","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YUUVQPOT","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:YUUVQPOTDE2QCT2JN3PKXH4TCP","target":"record","payload":{"canonical_record":{"source":{"id":"1802.07732","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T19:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"13bf30b81e04b3251767e07f740b9f6eb973a07f3c7dde393478b153e3ba2fc2","abstract_canon_sha256":"8e381aae07c290dfc290953ce45ee47dc51ace0ecce8ce15b47fc5e90df13120"},"schema_version":"1.0"},"canonical_sha256":"c529583dd31935014f496edeab9f9313e19e4dbbafdab518dd8e29d81127cb5c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:10:38.415898Z","signature_b64":"TUBvlnpNRvILEqm3S64ddNUtqNzCDtKcvNqPOtQrs0C+S+uvTJ/PGxsTC4FNj4Anp5+TX542zwOwl7zksfYbBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c529583dd31935014f496edeab9f9313e19e4dbbafdab518dd8e29d81127cb5c","last_reissued_at":"2026-05-18T00:10:38.415272Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:10:38.415272Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.07732","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":"2026-05-18T00:10:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q8bUsbhF6/LPi6td/fcK6uzisVUbvfX/NEPhFB95BvyF4or57qhQmUMSmtgcEs9UDDyt9CUU6x8feOBnN6nrBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T02:11:57.307625Z"},"content_sha256":"6c5d8304005e7a56e325ca9880028e94d2aed984cde82497ab809e22d6803cb3","schema_version":"1.0","event_id":"sha256:6c5d8304005e7a56e325ca9880028e94d2aed984cde82497ab809e22d6803cb3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:YUUVQPOTDE2QCT2JN3PKXH4TCP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Is the macronova in GW170817 powered by the central engine?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Ehud Nakar, Kunihito Ioka, Shota Kisaka, Tatsuya Matsumoto","submitted_at":"2018-02-21T19:00:02Z","abstract_excerpt":"The gravitational wave event GW170817 from a binary neutron star (NS) merger is accompanied by electromagnetic counterparts, and the optical and near-infared emission is called a macronova (or kilonova). Although the radioactivity of synthesized r-process elements is widely discussed as an energy source, its decisive evidence is not clearly shown yet. We discuss a macronova powered by the central engine activities such as jet activities and X-rays from the matter fallback, and show that the engine model allows much broader parameter spaces, in particular smaller ejecta mass ($\\sim10^{-4}-0.01\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07732","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":"2026-05-18T00:10:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mDCvR6qQTNj7+NUmMt/rMN3FFKPc6uGQaUvMgtGEn63IPIkuLSQigqLwA15S5BnpVZx39j2F0zOi3ndwwk0+DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T02:11:57.307973Z"},"content_sha256":"e303200be9ce8fe8d0029680a388b0cf064a54639c17918d6310b8124d56b5f7","schema_version":"1.0","event_id":"sha256:e303200be9ce8fe8d0029680a388b0cf064a54639c17918d6310b8124d56b5f7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YUUVQPOTDE2QCT2JN3PKXH4TCP/bundle.json","state_url":"https://pith.science/pith/YUUVQPOTDE2QCT2JN3PKXH4TCP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YUUVQPOTDE2QCT2JN3PKXH4TCP/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":"2026-06-02T02:11:57Z","links":{"resolver":"https://pith.science/pith/YUUVQPOTDE2QCT2JN3PKXH4TCP","bundle":"https://pith.science/pith/YUUVQPOTDE2QCT2JN3PKXH4TCP/bundle.json","state":"https://pith.science/pith/YUUVQPOTDE2QCT2JN3PKXH4TCP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YUUVQPOTDE2QCT2JN3PKXH4TCP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:YUUVQPOTDE2QCT2JN3PKXH4TCP","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":"8e381aae07c290dfc290953ce45ee47dc51ace0ecce8ce15b47fc5e90df13120","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T19:00:02Z","title_canon_sha256":"13bf30b81e04b3251767e07f740b9f6eb973a07f3c7dde393478b153e3ba2fc2"},"schema_version":"1.0","source":{"id":"1802.07732","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07732","created_at":"2026-05-18T00:10:38Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07732v2","created_at":"2026-05-18T00:10:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07732","created_at":"2026-05-18T00:10:38Z"},{"alias_kind":"pith_short_12","alias_value":"YUUVQPOTDE2Q","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YUUVQPOTDE2QCT2J","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YUUVQPOT","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:e303200be9ce8fe8d0029680a388b0cf064a54639c17918d6310b8124d56b5f7","target":"graph","created_at":"2026-05-18T00:10:38Z","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 gravitational wave event GW170817 from a binary neutron star (NS) merger is accompanied by electromagnetic counterparts, and the optical and near-infared emission is called a macronova (or kilonova). Although the radioactivity of synthesized r-process elements is widely discussed as an energy source, its decisive evidence is not clearly shown yet. We discuss a macronova powered by the central engine activities such as jet activities and X-rays from the matter fallback, and show that the engine model allows much broader parameter spaces, in particular smaller ejecta mass ($\\sim10^{-4}-0.01\\","authors_text":"Ehud Nakar, Kunihito Ioka, Shota Kisaka, Tatsuya Matsumoto","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T19:00:02Z","title":"Is the macronova in GW170817 powered by the central engine?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07732","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":"sha256:6c5d8304005e7a56e325ca9880028e94d2aed984cde82497ab809e22d6803cb3","target":"record","created_at":"2026-05-18T00:10:38Z","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":"8e381aae07c290dfc290953ce45ee47dc51ace0ecce8ce15b47fc5e90df13120","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T19:00:02Z","title_canon_sha256":"13bf30b81e04b3251767e07f740b9f6eb973a07f3c7dde393478b153e3ba2fc2"},"schema_version":"1.0","source":{"id":"1802.07732","kind":"arxiv","version":2}},"canonical_sha256":"c529583dd31935014f496edeab9f9313e19e4dbbafdab518dd8e29d81127cb5c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c529583dd31935014f496edeab9f9313e19e4dbbafdab518dd8e29d81127cb5c","first_computed_at":"2026-05-18T00:10:38.415272Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:10:38.415272Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TUBvlnpNRvILEqm3S64ddNUtqNzCDtKcvNqPOtQrs0C+S+uvTJ/PGxsTC4FNj4Anp5+TX542zwOwl7zksfYbBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:10:38.415898Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.07732","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6c5d8304005e7a56e325ca9880028e94d2aed984cde82497ab809e22d6803cb3","sha256:e303200be9ce8fe8d0029680a388b0cf064a54639c17918d6310b8124d56b5f7"],"state_sha256":"68c191de852b31d2cb4094ff03de6570f125a0ec4ecfe2126a967c40115ccd8c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oKCcT3aPr1MK3H3lcgaJT9ubdpma0VVfsRX9Y/jucMefdPREJ66ZBfOlMMh3Cvfdb1gXdZ4eEJWc0kTWejBlDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T02:11:57.309976Z","bundle_sha256":"048d68ea49827f3ab4caf5d55a5f96b9afafda86bc4e87537529aaeeaab3a636"}}