{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:4XLJY5ALOEJLKUKM5OGADV26N2","short_pith_number":"pith:4XLJY5AL","canonical_record":{"source":{"id":"1810.03650","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-08T18:29:30Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"49ceda8e13df55a397d86b9b43b51433df0a974f771303e461f33fff198ea915","abstract_canon_sha256":"f2a9b5574a10cfdd3a7e849609b690b92b67f9254edab4aa93815e5a8ed5ba44"},"schema_version":"1.0"},"canonical_sha256":"e5d69c740b7112b5514ceb8c01d75e6ebc270389ddbfd5c150ae238caf436f23","source":{"kind":"arxiv","id":"1810.03650","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.03650","created_at":"2026-05-18T00:03:00Z"},{"alias_kind":"arxiv_version","alias_value":"1810.03650v2","created_at":"2026-05-18T00:03:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.03650","created_at":"2026-05-18T00:03:00Z"},{"alias_kind":"pith_short_12","alias_value":"4XLJY5ALOEJL","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_16","alias_value":"4XLJY5ALOEJLKUKM","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_8","alias_value":"4XLJY5AL","created_at":"2026-05-18T12:32:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:4XLJY5ALOEJLKUKM5OGADV26N2","target":"record","payload":{"canonical_record":{"source":{"id":"1810.03650","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-08T18:29:30Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"49ceda8e13df55a397d86b9b43b51433df0a974f771303e461f33fff198ea915","abstract_canon_sha256":"f2a9b5574a10cfdd3a7e849609b690b92b67f9254edab4aa93815e5a8ed5ba44"},"schema_version":"1.0"},"canonical_sha256":"e5d69c740b7112b5514ceb8c01d75e6ebc270389ddbfd5c150ae238caf436f23","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:03:00.943075Z","signature_b64":"UthuSDm+uWf0/zaYU0m6SPDfPXlxSqFS6XsY23diXk31uM7jIV/rkfdPmwfOiBGtoyY9O1cn/xNzbRiz2d2QCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e5d69c740b7112b5514ceb8c01d75e6ebc270389ddbfd5c150ae238caf436f23","last_reissued_at":"2026-05-18T00:03:00.942486Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:03:00.942486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.03650","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":"2026-05-18T00:03:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C/SoQgrjOw8UJi2vO5p/AtJOk4pBn8jo51hN0fMAuRECEfJm8W3xg7RJthxF39fDwyPz7D72tlnUr1/ME7otDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T17:59:05.312979Z"},"content_sha256":"4cf5b8e8485f92ab17d4fd6dc9dc696a9e3d4f42c05cc6a86f12ed8cd0e97cdb","schema_version":"1.0","event_id":"sha256:4cf5b8e8485f92ab17d4fd6dc9dc696a9e3d4f42c05cc6a86f12ed8cd0e97cdb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:4XLJY5ALOEJLKUKM5OGADV26N2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Berkeley Sample of Stripped-Envelope Supernovae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.SR","authors_text":"Aaron J. Barth, Alexei V. Filippenko, Brandon J. Swift, Diane S. Wong, Douglas C. Leonard, Franklin J. D. Serduke, Heechan Yuk, Io K. W. Kleiser, Isaac Shivvers, Jeffrey M. Silverman, Jon C. Mauerhan, Joseph C. Shields, Kelsey I. Clubb, Maryam Modjaz, Melissa L. Graham, Mohan Ganeshalingam, Ori D. Fox, Patrick L. Kelly, Ryan Chornock, Ryan J. Foley, S. Bradley Cenko, Thea N. Steele, Thomas Matheson, Weidong Li, Weikang Zheng","submitted_at":"2018-10-08T18:29:30Z","abstract_excerpt":"We present the complete sample of stripped-envelope supernova (SN) spectra observed by the Lick Observatory Supernova Search (LOSS) collaboration over the last three decades: 888 spectra of 302 SNe, 652 published here for the first time, with 384 spectra (of 92 SNe) having photometrically-determined phases. After correcting for redshift and Milky Way dust reddening and reevaluating the spectroscopic classifications for each SN, we construct mean spectra of the three major spectral subtypes (Types IIb, Ib, and Ic) binned by phase. We compare measures of line strengths and widths made from this "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.03650","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":"2026-05-18T00:03:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vTNgsbUOAyPwRQ11q6kAxbU2U1NsoTHsLcoTesaFCIwgDZI4U9IK9oogUqJRhORqb90KcVplYwkrBpNaCixcDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T17:59:05.313359Z"},"content_sha256":"af4780d0d0655d1fcc41626f54d5b1cf4bf6a56f08fe8fcc5cf8e0e301e5597c","schema_version":"1.0","event_id":"sha256:af4780d0d0655d1fcc41626f54d5b1cf4bf6a56f08fe8fcc5cf8e0e301e5597c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4XLJY5ALOEJLKUKM5OGADV26N2/bundle.json","state_url":"https://pith.science/pith/4XLJY5ALOEJLKUKM5OGADV26N2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4XLJY5ALOEJLKUKM5OGADV26N2/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":"2026-06-02T17:59:05Z","links":{"resolver":"https://pith.science/pith/4XLJY5ALOEJLKUKM5OGADV26N2","bundle":"https://pith.science/pith/4XLJY5ALOEJLKUKM5OGADV26N2/bundle.json","state":"https://pith.science/pith/4XLJY5ALOEJLKUKM5OGADV26N2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4XLJY5ALOEJLKUKM5OGADV26N2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:4XLJY5ALOEJLKUKM5OGADV26N2","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":"f2a9b5574a10cfdd3a7e849609b690b92b67f9254edab4aa93815e5a8ed5ba44","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-08T18:29:30Z","title_canon_sha256":"49ceda8e13df55a397d86b9b43b51433df0a974f771303e461f33fff198ea915"},"schema_version":"1.0","source":{"id":"1810.03650","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.03650","created_at":"2026-05-18T00:03:00Z"},{"alias_kind":"arxiv_version","alias_value":"1810.03650v2","created_at":"2026-05-18T00:03:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.03650","created_at":"2026-05-18T00:03:00Z"},{"alias_kind":"pith_short_12","alias_value":"4XLJY5ALOEJL","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_16","alias_value":"4XLJY5ALOEJLKUKM","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_8","alias_value":"4XLJY5AL","created_at":"2026-05-18T12:32:05Z"}],"graph_snapshots":[{"event_id":"sha256:af4780d0d0655d1fcc41626f54d5b1cf4bf6a56f08fe8fcc5cf8e0e301e5597c","target":"graph","created_at":"2026-05-18T00:03:00Z","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 the complete sample of stripped-envelope supernova (SN) spectra observed by the Lick Observatory Supernova Search (LOSS) collaboration over the last three decades: 888 spectra of 302 SNe, 652 published here for the first time, with 384 spectra (of 92 SNe) having photometrically-determined phases. After correcting for redshift and Milky Way dust reddening and reevaluating the spectroscopic classifications for each SN, we construct mean spectra of the three major spectral subtypes (Types IIb, Ib, and Ic) binned by phase. We compare measures of line strengths and widths made from this ","authors_text":"Aaron J. Barth, Alexei V. Filippenko, Brandon J. Swift, Diane S. Wong, Douglas C. Leonard, Franklin J. D. Serduke, Heechan Yuk, Io K. W. Kleiser, Isaac Shivvers, Jeffrey M. Silverman, Jon C. Mauerhan, Joseph C. Shields, Kelsey I. Clubb, Maryam Modjaz, Melissa L. Graham, Mohan Ganeshalingam, Ori D. Fox, Patrick L. Kelly, Ryan Chornock, Ryan J. Foley, S. Bradley Cenko, Thea N. Steele, Thomas Matheson, Weidong Li, Weikang Zheng","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-08T18:29:30Z","title":"The Berkeley Sample of Stripped-Envelope Supernovae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.03650","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":"sha256:4cf5b8e8485f92ab17d4fd6dc9dc696a9e3d4f42c05cc6a86f12ed8cd0e97cdb","target":"record","created_at":"2026-05-18T00:03:00Z","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":"f2a9b5574a10cfdd3a7e849609b690b92b67f9254edab4aa93815e5a8ed5ba44","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-08T18:29:30Z","title_canon_sha256":"49ceda8e13df55a397d86b9b43b51433df0a974f771303e461f33fff198ea915"},"schema_version":"1.0","source":{"id":"1810.03650","kind":"arxiv","version":2}},"canonical_sha256":"e5d69c740b7112b5514ceb8c01d75e6ebc270389ddbfd5c150ae238caf436f23","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e5d69c740b7112b5514ceb8c01d75e6ebc270389ddbfd5c150ae238caf436f23","first_computed_at":"2026-05-18T00:03:00.942486Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:03:00.942486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UthuSDm+uWf0/zaYU0m6SPDfPXlxSqFS6XsY23diXk31uM7jIV/rkfdPmwfOiBGtoyY9O1cn/xNzbRiz2d2QCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:03:00.943075Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.03650","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4cf5b8e8485f92ab17d4fd6dc9dc696a9e3d4f42c05cc6a86f12ed8cd0e97cdb","sha256:af4780d0d0655d1fcc41626f54d5b1cf4bf6a56f08fe8fcc5cf8e0e301e5597c"],"state_sha256":"492ff105bcc05866034a51e56aa810e3db6c8f2d910220941551cd162545a3a9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3F66WCuR0CrK+nAZyXOAof7jGOai4Dgqi5Bmc0AmbxodPsEnBSim4vyyginioum70243qKO8JMPzp/TUtIEbDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T17:59:05.315414Z","bundle_sha256":"2b9b3d76fa9f0d7b8424b1be908815fdf1ad5c5ac098d412cc15760ba3a67557"}}