{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:I5M7UJG3M76PFMH5IJYC74HAJV","short_pith_number":"pith:I5M7UJG3","canonical_record":{"source":{"id":"1902.02251","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-06T16:01:57Z","cross_cats_sorted":[],"title_canon_sha256":"a818641ad75d7e0d95b4649e66acd148b9b25a9832f8628f8d8de88f3f69b353","abstract_canon_sha256":"5c9750dec80519bd71d2f96196a340ba702534d6c3a8139779a88eda3938fd6e"},"schema_version":"1.0"},"canonical_sha256":"4759fa24db67fcf2b0fd42702ff0e04d654f30451ebe4355c5022ca57b5d31f2","source":{"kind":"arxiv","id":"1902.02251","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.02251","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"arxiv_version","alias_value":"1902.02251v1","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.02251","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"pith_short_12","alias_value":"I5M7UJG3M76P","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"I5M7UJG3M76PFMH5","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"I5M7UJG3","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:I5M7UJG3M76PFMH5IJYC74HAJV","target":"record","payload":{"canonical_record":{"source":{"id":"1902.02251","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-06T16:01:57Z","cross_cats_sorted":[],"title_canon_sha256":"a818641ad75d7e0d95b4649e66acd148b9b25a9832f8628f8d8de88f3f69b353","abstract_canon_sha256":"5c9750dec80519bd71d2f96196a340ba702534d6c3a8139779a88eda3938fd6e"},"schema_version":"1.0"},"canonical_sha256":"4759fa24db67fcf2b0fd42702ff0e04d654f30451ebe4355c5022ca57b5d31f2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:01.984915Z","signature_b64":"lLsyv00HRiHTqu7oMdFVq6uGLA09Bp70es2Qoa4NLjvH69VBJdmjaJMgghmRluXzROLuQLVy+VmeoJ9hjQRCCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4759fa24db67fcf2b0fd42702ff0e04d654f30451ebe4355c5022ca57b5d31f2","last_reissued_at":"2026-05-17T23:49:01.984485Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:01.984485Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.02251","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":"2026-05-17T23:49:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rXzP5r8e24XknlhUajgOV5B9jZmxJqhsKcWfRq0efNB3tGfpmK7lmvGuSzV/PPokfTAZhXwreik1CGbZcU3/CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T08:10:29.343969Z"},"content_sha256":"48f68ff05daf21841fbb146f1de447612e94d953767e7150cbe23c04853c75c6","schema_version":"1.0","event_id":"sha256:48f68ff05daf21841fbb146f1de447612e94d953767e7150cbe23c04853c75c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:I5M7UJG3M76PFMH5IJYC74HAJV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"H-$\\alpha$ emission in the nebular spectrum of the Type Ia supernova ASASSN-18tb","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Anthony L. Piro, Doron Kushnir, J. L. Prieto, Joshua D. Simon, Juna A. Kollmeier, M. M. Phillips, Nidia Morrell, Ping Chen, Subo Dong","submitted_at":"2019-02-06T16:01:57Z","abstract_excerpt":"As part of the 100IAS survey, a program aimed to obtain nebular-phase spectra for a volume-limited and homogeneous sample of Type Ia supernovae (SNe Ia), we observed ASASSN-18tb (SN 2018fhw) at 139 days past maximum light. ASASSN-18tb was a fast-declining, sub-luminous event that fits well within the observed photometric and spectroscopic distributions of the SN Ia population. We detect a prominent H$\\alpha$ emission line of $L_{{\\rm H}\\alpha}=2.2\\pm0.2\\times10^{38}$ ergs s$^{-1}$ with FWHM $\\approx1100$ km s$^{-1}$ in the nebular-phase spectrum of this SN Ia. High luminosity H$\\alpha$ emissio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.02251","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":"2026-05-17T23:49:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RZZtctKt9WThhHMlllx1I7a0jNxw2NZhP322dB03LkjAe6SkovpIfKXDRQJQGXnZEKd+xuqP+RPa43/Yh4cvBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-20T08:10:29.344326Z"},"content_sha256":"0d76b6a614deb0c0f78980599973d0bb2b1fd0e348da4237be0f895e619f2453","schema_version":"1.0","event_id":"sha256:0d76b6a614deb0c0f78980599973d0bb2b1fd0e348da4237be0f895e619f2453"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I5M7UJG3M76PFMH5IJYC74HAJV/bundle.json","state_url":"https://pith.science/pith/I5M7UJG3M76PFMH5IJYC74HAJV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I5M7UJG3M76PFMH5IJYC74HAJV/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":"2026-06-20T08:10:29Z","links":{"resolver":"https://pith.science/pith/I5M7UJG3M76PFMH5IJYC74HAJV","bundle":"https://pith.science/pith/I5M7UJG3M76PFMH5IJYC74HAJV/bundle.json","state":"https://pith.science/pith/I5M7UJG3M76PFMH5IJYC74HAJV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I5M7UJG3M76PFMH5IJYC74HAJV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:I5M7UJG3M76PFMH5IJYC74HAJV","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":"5c9750dec80519bd71d2f96196a340ba702534d6c3a8139779a88eda3938fd6e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-06T16:01:57Z","title_canon_sha256":"a818641ad75d7e0d95b4649e66acd148b9b25a9832f8628f8d8de88f3f69b353"},"schema_version":"1.0","source":{"id":"1902.02251","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.02251","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"arxiv_version","alias_value":"1902.02251v1","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.02251","created_at":"2026-05-17T23:49:01Z"},{"alias_kind":"pith_short_12","alias_value":"I5M7UJG3M76P","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"I5M7UJG3M76PFMH5","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"I5M7UJG3","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:0d76b6a614deb0c0f78980599973d0bb2b1fd0e348da4237be0f895e619f2453","target":"graph","created_at":"2026-05-17T23:49:01Z","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":"As part of the 100IAS survey, a program aimed to obtain nebular-phase spectra for a volume-limited and homogeneous sample of Type Ia supernovae (SNe Ia), we observed ASASSN-18tb (SN 2018fhw) at 139 days past maximum light. ASASSN-18tb was a fast-declining, sub-luminous event that fits well within the observed photometric and spectroscopic distributions of the SN Ia population. We detect a prominent H$\\alpha$ emission line of $L_{{\\rm H}\\alpha}=2.2\\pm0.2\\times10^{38}$ ergs s$^{-1}$ with FWHM $\\approx1100$ km s$^{-1}$ in the nebular-phase spectrum of this SN Ia. High luminosity H$\\alpha$ emissio","authors_text":"Anthony L. Piro, Doron Kushnir, J. L. Prieto, Joshua D. Simon, Juna A. Kollmeier, M. M. Phillips, Nidia Morrell, Ping Chen, Subo Dong","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-06T16:01:57Z","title":"H-$\\alpha$ emission in the nebular spectrum of the Type Ia supernova ASASSN-18tb"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.02251","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":"sha256:48f68ff05daf21841fbb146f1de447612e94d953767e7150cbe23c04853c75c6","target":"record","created_at":"2026-05-17T23:49:01Z","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":"5c9750dec80519bd71d2f96196a340ba702534d6c3a8139779a88eda3938fd6e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-02-06T16:01:57Z","title_canon_sha256":"a818641ad75d7e0d95b4649e66acd148b9b25a9832f8628f8d8de88f3f69b353"},"schema_version":"1.0","source":{"id":"1902.02251","kind":"arxiv","version":1}},"canonical_sha256":"4759fa24db67fcf2b0fd42702ff0e04d654f30451ebe4355c5022ca57b5d31f2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4759fa24db67fcf2b0fd42702ff0e04d654f30451ebe4355c5022ca57b5d31f2","first_computed_at":"2026-05-17T23:49:01.984485Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:01.984485Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lLsyv00HRiHTqu7oMdFVq6uGLA09Bp70es2Qoa4NLjvH69VBJdmjaJMgghmRluXzROLuQLVy+VmeoJ9hjQRCCQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:01.984915Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.02251","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:48f68ff05daf21841fbb146f1de447612e94d953767e7150cbe23c04853c75c6","sha256:0d76b6a614deb0c0f78980599973d0bb2b1fd0e348da4237be0f895e619f2453"],"state_sha256":"890d9de3342633198fa68174213fab80a33c217c63f083ebe98b7a08f4f9f369"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R0UoxCWkqN76zDjQVn0+pQ6jehKZI6BuS6noMEFkTlp58KCyqosmNsFl2OtcHAlwqgMkesGP0XcBxOFmFjFbAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-20T08:10:29.346373Z","bundle_sha256":"331b990a63b616e1eb1bf4af703845304c12ee614f1b2443bf71fb1c76f4964f"}}