{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:WPKFVHVDWH3V5ITOTAXVVCTDGP","short_pith_number":"pith:WPKFVHVD","canonical_record":{"source":{"id":"1911.08387","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-11-19T16:36:18Z","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"title_canon_sha256":"44aaa57061b13d3797ba63815b046d7b53b373b12a373adeeeb2ae7e3ced3931","abstract_canon_sha256":"8728b16fd2d9f2efacd99b911c54a421b65b436f5daba6afddf3cdc92450232c"},"schema_version":"1.0"},"canonical_sha256":"b3d45a9ea3b1f75ea26e982f5a8a6333f400c546b2852816f70ab70908ec3ce3","source":{"kind":"arxiv","id":"1911.08387","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1911.08387","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"arxiv_version","alias_value":"1911.08387v1","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1911.08387","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"pith_short_12","alias_value":"WPKFVHVDWH3V","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"pith_short_16","alias_value":"WPKFVHVDWH3V5ITO","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"pith_short_8","alias_value":"WPKFVHVD","created_at":"2026-07-05T00:20:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:WPKFVHVDWH3V5ITOTAXVVCTDGP","target":"record","payload":{"canonical_record":{"source":{"id":"1911.08387","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-11-19T16:36:18Z","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"title_canon_sha256":"44aaa57061b13d3797ba63815b046d7b53b373b12a373adeeeb2ae7e3ced3931","abstract_canon_sha256":"8728b16fd2d9f2efacd99b911c54a421b65b436f5daba6afddf3cdc92450232c"},"schema_version":"1.0"},"canonical_sha256":"b3d45a9ea3b1f75ea26e982f5a8a6333f400c546b2852816f70ab70908ec3ce3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:20:28.328477Z","signature_b64":"1wUibOvRVweZxyCLfEZYYvpsubwrg9eg0UQlq6yI/Oin+iqyMuq5Z6fMa02qMse9g0FeP+9TvgWcOyYJn1A7Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b3d45a9ea3b1f75ea26e982f5a8a6333f400c546b2852816f70ab70908ec3ce3","last_reissued_at":"2026-07-05T00:20:28.328080Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:20:28.328080Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1911.08387","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":"2026-07-05T00:20:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XxTxRFlqEonP3ZdP/j0uhTmsMPNULMqn9LR12Y/RisTwZWSvHNsS2klYIjEv3VKQ6MTRCcB32LYYULnKixY4CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T07:28:59.349232Z"},"content_sha256":"828eab9b3ac699bf92df1ebb091ff6ea6cc93adcb14a78fafe433353069a2fe1","schema_version":"1.0","event_id":"sha256:828eab9b3ac699bf92df1ebb091ff6ea6cc93adcb14a78fafe433353069a2fe1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:WPKFVHVDWH3V5ITOTAXVVCTDGP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Binary population synthesis models for core-collapse gamma-ray burst progenitors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. A. Chrimes, E. R. Stanway, J. J. Eldridge","submitted_at":"2019-11-19T16:36:18Z","abstract_excerpt":"Long-duration gamma-ray bursts (GRBs) are understood to be the final fate for a subset of massive, stripped envelope, rapidly rotating stars. Beyond this, our knowledge of the progenitor systems is limited. Using the BPASS (Binary Population and Spectral Synthesis) stellar evolution models, we investigate the possibility that some massive stars in binaries can maintain the angular momentum required for jet production, while still loosing their outer envelope through winds or binary interactions. We find that a total hydrogen mass of less than 0.0005 Msun and a helium ejecta mass fraction of le"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1911.08387","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1911.08387/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:20:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+o24yyZ5NxNYM1DbJEM+Kb0rBq41+nS8fZPdzjOzdCaE7CZg/+OvT3ej+SsH+ZeSh9o58gJLyEsxk0mK5mN+CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T07:28:59.350499Z"},"content_sha256":"be4364782c9a309ce75989d545515b88cff06faa4e26587c669e988e8d096a94","schema_version":"1.0","event_id":"sha256:be4364782c9a309ce75989d545515b88cff06faa4e26587c669e988e8d096a94"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WPKFVHVDWH3V5ITOTAXVVCTDGP/bundle.json","state_url":"https://pith.science/pith/WPKFVHVDWH3V5ITOTAXVVCTDGP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WPKFVHVDWH3V5ITOTAXVVCTDGP/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":"2026-08-12T07:28:59Z","links":{"resolver":"https://pith.science/pith/WPKFVHVDWH3V5ITOTAXVVCTDGP","bundle":"https://pith.science/pith/WPKFVHVDWH3V5ITOTAXVVCTDGP/bundle.json","state":"https://pith.science/pith/WPKFVHVDWH3V5ITOTAXVVCTDGP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WPKFVHVDWH3V5ITOTAXVVCTDGP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:WPKFVHVDWH3V5ITOTAXVVCTDGP","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":"8728b16fd2d9f2efacd99b911c54a421b65b436f5daba6afddf3cdc92450232c","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-11-19T16:36:18Z","title_canon_sha256":"44aaa57061b13d3797ba63815b046d7b53b373b12a373adeeeb2ae7e3ced3931"},"schema_version":"1.0","source":{"id":"1911.08387","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1911.08387","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"arxiv_version","alias_value":"1911.08387v1","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1911.08387","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"pith_short_12","alias_value":"WPKFVHVDWH3V","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"pith_short_16","alias_value":"WPKFVHVDWH3V5ITO","created_at":"2026-07-05T00:20:28Z"},{"alias_kind":"pith_short_8","alias_value":"WPKFVHVD","created_at":"2026-07-05T00:20:28Z"}],"graph_snapshots":[{"event_id":"sha256:be4364782c9a309ce75989d545515b88cff06faa4e26587c669e988e8d096a94","target":"graph","created_at":"2026-07-05T00:20:28Z","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/1911.08387/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Long-duration gamma-ray bursts (GRBs) are understood to be the final fate for a subset of massive, stripped envelope, rapidly rotating stars. Beyond this, our knowledge of the progenitor systems is limited. Using the BPASS (Binary Population and Spectral Synthesis) stellar evolution models, we investigate the possibility that some massive stars in binaries can maintain the angular momentum required for jet production, while still loosing their outer envelope through winds or binary interactions. We find that a total hydrogen mass of less than 0.0005 Msun and a helium ejecta mass fraction of le","authors_text":"A. A. Chrimes, E. R. Stanway, J. J. Eldridge","cross_cats":["astro-ph.GA","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-11-19T16:36:18Z","title":"Binary population synthesis models for core-collapse gamma-ray burst progenitors"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1911.08387","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":"sha256:828eab9b3ac699bf92df1ebb091ff6ea6cc93adcb14a78fafe433353069a2fe1","target":"record","created_at":"2026-07-05T00:20:28Z","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":"8728b16fd2d9f2efacd99b911c54a421b65b436f5daba6afddf3cdc92450232c","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-11-19T16:36:18Z","title_canon_sha256":"44aaa57061b13d3797ba63815b046d7b53b373b12a373adeeeb2ae7e3ced3931"},"schema_version":"1.0","source":{"id":"1911.08387","kind":"arxiv","version":1}},"canonical_sha256":"b3d45a9ea3b1f75ea26e982f5a8a6333f400c546b2852816f70ab70908ec3ce3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b3d45a9ea3b1f75ea26e982f5a8a6333f400c546b2852816f70ab70908ec3ce3","first_computed_at":"2026-07-05T00:20:28.328080Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:20:28.328080Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1wUibOvRVweZxyCLfEZYYvpsubwrg9eg0UQlq6yI/Oin+iqyMuq5Z6fMa02qMse9g0FeP+9TvgWcOyYJn1A7Cw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:20:28.328477Z","signed_message":"canonical_sha256_bytes"},"source_id":"1911.08387","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:828eab9b3ac699bf92df1ebb091ff6ea6cc93adcb14a78fafe433353069a2fe1","sha256:be4364782c9a309ce75989d545515b88cff06faa4e26587c669e988e8d096a94"],"state_sha256":"fa08bec756eaac4c2775c85c1a4d3a6b90e21e5d677b5201175131d1f1c5f910"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z3LSmbD3CQvBSIYpIsb031RZKaBxXx2av8uO7EvLAV5doezAVcvZSHvH+VOYyjSR7HiDGfX+uSXnZBA9LPIwAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-12T07:28:59.356674Z","bundle_sha256":"7b79f1fd40a2c8b7d979f3fc26b299dfa71cf0b6eb5a1701ee66a1535b8d7e20"}}