{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:IOINFEZNLNKUKVHKGPLSLVH6VY","short_pith_number":"pith:IOINFEZN","canonical_record":{"source":{"id":"1904.05897","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-04-11T18:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"13c1e104cb5f4b95a34f63917736c37cbf8e30788f8caa566be87410cf35a922","abstract_canon_sha256":"5b2e2bc51fc57bbcdd81b7378da3f5f02ede9e09dcfa7f9214f00867268dc2d1"},"schema_version":"1.0"},"canonical_sha256":"4390d2932d5b554554ea33d725d4feae1b7dbab556720b1163d7d1587964c4c5","source":{"kind":"arxiv","id":"1904.05897","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.05897","created_at":"2026-05-17T23:48:44Z"},{"alias_kind":"arxiv_version","alias_value":"1904.05897v1","created_at":"2026-05-17T23:48:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.05897","created_at":"2026-05-17T23:48:44Z"},{"alias_kind":"pith_short_12","alias_value":"IOINFEZNLNKU","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"IOINFEZNLNKUKVHK","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"IOINFEZN","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:IOINFEZNLNKUKVHKGPLSLVH6VY","target":"record","payload":{"canonical_record":{"source":{"id":"1904.05897","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-04-11T18:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"13c1e104cb5f4b95a34f63917736c37cbf8e30788f8caa566be87410cf35a922","abstract_canon_sha256":"5b2e2bc51fc57bbcdd81b7378da3f5f02ede9e09dcfa7f9214f00867268dc2d1"},"schema_version":"1.0"},"canonical_sha256":"4390d2932d5b554554ea33d725d4feae1b7dbab556720b1163d7d1587964c4c5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:48:44.777669Z","signature_b64":"c8uyHxL+VRM1EgdKdsD6IeT54qTGcBW67lrM52YwBjKgPzQ87KnzxhECmp/OPOtJootWQBaJ9X0+iGjo8NxtCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4390d2932d5b554554ea33d725d4feae1b7dbab556720b1163d7d1587964c4c5","last_reissued_at":"2026-05-17T23:48:44.777124Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:48:44.777124Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.05897","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":"2026-05-17T23:48:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9kpuAdIVcPzn/miG8+atg+Ksrv4cfBLId7pfEx+nNIlMC+r6lW8dgLM0gMie0882aOT6TZn0FbF1Hb6mNb2GDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T07:33:03.865929Z"},"content_sha256":"0cec1886dcd24f0f0cd6e8bfc7ac6a84ce2d39765cb447ea600baa4085e72c08","schema_version":"1.0","event_id":"sha256:0cec1886dcd24f0f0cd6e8bfc7ac6a84ce2d39765cb447ea600baa4085e72c08"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:IOINFEZNLNKUKVHKGPLSLVH6VY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Achieving Transformative Understanding of Extreme Stellar Explosions with ELT-enabled Late-time Spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Rest, A. V. Filippenko, B. D. Metzger, C.-H. Lee, D. Coppejans, D. DePoy, D. Milisavljevic, E. Berger, G. Stringfellow, G. Terreran, G. Williams, J. Andrews, J. Bloom, J. C. Wheeler, J. Marshall, J. Mauerhan, J. Rho, K. S. Long, M. Graham, M. Modjaz, M. R. Drout, N. Smith, N. Sravan, O. Fox, P. F. Winkler, P. Garnavich, P. S. Cowperthwaite, R. A. Chevalier, R. A. Fesen, R. Chornock, R. Margutti, R. Street, S. Starrfield, V. Z. Golkhou, W. Kerzendorf, W. P. Blair, W. Skidmore, Y. Haojing","submitted_at":"2019-04-11T18:00:02Z","abstract_excerpt":"Supernovae are among the most powerful and influential explosions in the universe. They are also ideal multi-messenger laboratories to study extreme astrophysics. However, many fundamental properties of supernovae related to their diverse progenitor systems and explosion mechanisms remain poorly constrained. Here we outline how late-time spectroscopic observations obtained during the nebular phase (several months to years after explosion), made possible with the next generation of Extremely Large Telescopes, will facilitate transformational science opportunities and rapidly accelerate the comm"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.05897","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":"2026-05-17T23:48:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YMy6zZihR20Gwu1BMsqvFk7UfrxCa9csnuLUPGo+MvFFYftvb2KQ95QdTQyOQOgPWue8Qx5C3K1B9nChOpQ0Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T07:33:03.866400Z"},"content_sha256":"8e391352721d70218af1d45866aac7a815ee57c78f9984b9a5d2b98d0c427d27","schema_version":"1.0","event_id":"sha256:8e391352721d70218af1d45866aac7a815ee57c78f9984b9a5d2b98d0c427d27"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IOINFEZNLNKUKVHKGPLSLVH6VY/bundle.json","state_url":"https://pith.science/pith/IOINFEZNLNKUKVHKGPLSLVH6VY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IOINFEZNLNKUKVHKGPLSLVH6VY/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":"2026-05-19T07:33:03Z","links":{"resolver":"https://pith.science/pith/IOINFEZNLNKUKVHKGPLSLVH6VY","bundle":"https://pith.science/pith/IOINFEZNLNKUKVHKGPLSLVH6VY/bundle.json","state":"https://pith.science/pith/IOINFEZNLNKUKVHKGPLSLVH6VY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IOINFEZNLNKUKVHKGPLSLVH6VY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:IOINFEZNLNKUKVHKGPLSLVH6VY","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":"5b2e2bc51fc57bbcdd81b7378da3f5f02ede9e09dcfa7f9214f00867268dc2d1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-04-11T18:00:02Z","title_canon_sha256":"13c1e104cb5f4b95a34f63917736c37cbf8e30788f8caa566be87410cf35a922"},"schema_version":"1.0","source":{"id":"1904.05897","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.05897","created_at":"2026-05-17T23:48:44Z"},{"alias_kind":"arxiv_version","alias_value":"1904.05897v1","created_at":"2026-05-17T23:48:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.05897","created_at":"2026-05-17T23:48:44Z"},{"alias_kind":"pith_short_12","alias_value":"IOINFEZNLNKU","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"IOINFEZNLNKUKVHK","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"IOINFEZN","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:8e391352721d70218af1d45866aac7a815ee57c78f9984b9a5d2b98d0c427d27","target":"graph","created_at":"2026-05-17T23:48:44Z","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":"Supernovae are among the most powerful and influential explosions in the universe. They are also ideal multi-messenger laboratories to study extreme astrophysics. However, many fundamental properties of supernovae related to their diverse progenitor systems and explosion mechanisms remain poorly constrained. Here we outline how late-time spectroscopic observations obtained during the nebular phase (several months to years after explosion), made possible with the next generation of Extremely Large Telescopes, will facilitate transformational science opportunities and rapidly accelerate the comm","authors_text":"A. Rest, A. V. Filippenko, B. D. Metzger, C.-H. Lee, D. Coppejans, D. DePoy, D. Milisavljevic, E. Berger, G. Stringfellow, G. Terreran, G. Williams, J. Andrews, J. Bloom, J. C. Wheeler, J. Marshall, J. Mauerhan, J. Rho, K. S. Long, M. Graham, M. Modjaz, M. R. Drout, N. Smith, N. Sravan, O. Fox, P. F. Winkler, P. Garnavich, P. S. Cowperthwaite, R. A. Chevalier, R. A. Fesen, R. Chornock, R. Margutti, R. Street, S. Starrfield, V. Z. Golkhou, W. Kerzendorf, W. P. Blair, W. Skidmore, Y. Haojing","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-04-11T18:00:02Z","title":"Achieving Transformative Understanding of Extreme Stellar Explosions with ELT-enabled Late-time Spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.05897","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":"sha256:0cec1886dcd24f0f0cd6e8bfc7ac6a84ce2d39765cb447ea600baa4085e72c08","target":"record","created_at":"2026-05-17T23:48:44Z","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":"5b2e2bc51fc57bbcdd81b7378da3f5f02ede9e09dcfa7f9214f00867268dc2d1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-04-11T18:00:02Z","title_canon_sha256":"13c1e104cb5f4b95a34f63917736c37cbf8e30788f8caa566be87410cf35a922"},"schema_version":"1.0","source":{"id":"1904.05897","kind":"arxiv","version":1}},"canonical_sha256":"4390d2932d5b554554ea33d725d4feae1b7dbab556720b1163d7d1587964c4c5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4390d2932d5b554554ea33d725d4feae1b7dbab556720b1163d7d1587964c4c5","first_computed_at":"2026-05-17T23:48:44.777124Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:48:44.777124Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"c8uyHxL+VRM1EgdKdsD6IeT54qTGcBW67lrM52YwBjKgPzQ87KnzxhECmp/OPOtJootWQBaJ9X0+iGjo8NxtCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:48:44.777669Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.05897","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0cec1886dcd24f0f0cd6e8bfc7ac6a84ce2d39765cb447ea600baa4085e72c08","sha256:8e391352721d70218af1d45866aac7a815ee57c78f9984b9a5d2b98d0c427d27"],"state_sha256":"dfae08ee6bab15a2c73125764992ce88197e55d7d3d76316711350a0cc1c05ac"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kLdVLLj3FvienLSZslDxbUkF82p9YYkRegp8mxxpoFQYs6/fBuMymyNdZd63F/+C2OJvQE9xLD69i8CV28nDCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T07:33:03.868366Z","bundle_sha256":"6c7af786c88bfedeb7a332ef0aab5e6d30631c86713df38e8f269b74b3fe21b9"}}