{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:MVAHQPYP2LT2GUUXMXJIUTKXXK","short_pith_number":"pith:MVAHQPYP","canonical_record":{"source":{"id":"1512.00846","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-02T11:58:51Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"5f02c944fbe66f49aee5dacc606a48062b6295b62398a03a5165f2c96924f252","abstract_canon_sha256":"3b60368debd0005a4c222d36287e6605ed446a0366334fc87fecffc4881131fc"},"schema_version":"1.0"},"canonical_sha256":"6540783f0fd2e7a3529765d28a4d57baadac5e7b731d9fd0a4a7a1b672ac913a","source":{"kind":"arxiv","id":"1512.00846","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.00846","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"arxiv_version","alias_value":"1512.00846v1","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.00846","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"pith_short_12","alias_value":"MVAHQPYP2LT2","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"MVAHQPYP2LT2GUUX","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"MVAHQPYP","created_at":"2026-05-18T12:29:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:MVAHQPYP2LT2GUUXMXJIUTKXXK","target":"record","payload":{"canonical_record":{"source":{"id":"1512.00846","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-02T11:58:51Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"5f02c944fbe66f49aee5dacc606a48062b6295b62398a03a5165f2c96924f252","abstract_canon_sha256":"3b60368debd0005a4c222d36287e6605ed446a0366334fc87fecffc4881131fc"},"schema_version":"1.0"},"canonical_sha256":"6540783f0fd2e7a3529765d28a4d57baadac5e7b731d9fd0a4a7a1b672ac913a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:20:32.916859Z","signature_b64":"MX1fiYfzD+Ka4QPUGFat8Wg3zzBH73f2yMjUcC40RpYf3LJS0xN46FDFzlEMhBd5Hw4aWEw3BOVN3sxX7gDIDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6540783f0fd2e7a3529765d28a4d57baadac5e7b731d9fd0a4a7a1b672ac913a","last_reissued_at":"2026-05-18T01:20:32.916448Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:20:32.916448Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.00846","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":"2026-05-18T01:20:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0eaJsLtfoZ6w0CXDwEFqiJ6UMdxinCXz62Ng1g9zFBdvVUtw6LSgMfeI6D9Zt4SA6WmLOI25+ghlDUtnNMHECQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T03:47:42.002330Z"},"content_sha256":"e27a4afa1846bbb1016f6ec3b6402b7e4ffc014d82923529e0f6b6bebb269188","schema_version":"1.0","event_id":"sha256:e27a4afa1846bbb1016f6ec3b6402b7e4ffc014d82923529e0f6b6bebb269188"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:MVAHQPYP2LT2GUUXMXJIUTKXXK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Flash Spectroscopy: Emission Lines from the Ionized Circumstellar Material around $<10$-Day-Old Type II Supernovae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A. Gal-Yam, A. Horesh, A. Rubin, A. V. Filippenko, D. A. Howell, D. Khazov, D. Perley, E. O. Ofek, F. Taddia, H. Ebeling, I. Arcavi, I. Manulis, J. Johansson, J. M. Silverman, J. Sollerman, J. Surace, M. M. Kasliwal, M. Sullivan, O. Yaron, P. E. Nugent, P. R. Wozniak, R. R. Laher, S. B. Cenko, S. R. Kulkarni, T. Matheson, U. D. Rebbapragada, Y. Cao","submitted_at":"2015-12-02T11:58:51Z","abstract_excerpt":"Supernovae (SNe) embedded in dense circumstellar material (CSM) may show prominent emission lines in their early-time spectra ($\\leq 10$ days after the explosion), owing to recombination of the CSM ionized by the shock-breakout flash. From such spectra (\"flash spectroscopy\"), we can measure various physical properties of the CSM, as well as the mass-loss rate of the progenitor during the year prior to its explosion. Searching through the Palomar Transient Factory (PTF and iPTF) SN spectroscopy databases from 2009 through 2014, we found 12 Type II SNe showing flash-ionized (FI) signatures in th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.00846","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":"2026-05-18T01:20:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aK2Z7FdVyFnHRejRGVaWkJk+a1GQIPpQGSWsbarrHOb7YGZiVePOyZGTRxgFYVimWVPV0davFcZ1Urrasfn0Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T03:47:42.003014Z"},"content_sha256":"93a1b7e07d754d0868944ab631b75189d5beec92c3a2d7f3c5966f42269a01b7","schema_version":"1.0","event_id":"sha256:93a1b7e07d754d0868944ab631b75189d5beec92c3a2d7f3c5966f42269a01b7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MVAHQPYP2LT2GUUXMXJIUTKXXK/bundle.json","state_url":"https://pith.science/pith/MVAHQPYP2LT2GUUXMXJIUTKXXK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MVAHQPYP2LT2GUUXMXJIUTKXXK/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":"2026-05-20T03:47:42Z","links":{"resolver":"https://pith.science/pith/MVAHQPYP2LT2GUUXMXJIUTKXXK","bundle":"https://pith.science/pith/MVAHQPYP2LT2GUUXMXJIUTKXXK/bundle.json","state":"https://pith.science/pith/MVAHQPYP2LT2GUUXMXJIUTKXXK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MVAHQPYP2LT2GUUXMXJIUTKXXK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:MVAHQPYP2LT2GUUXMXJIUTKXXK","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":"3b60368debd0005a4c222d36287e6605ed446a0366334fc87fecffc4881131fc","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-02T11:58:51Z","title_canon_sha256":"5f02c944fbe66f49aee5dacc606a48062b6295b62398a03a5165f2c96924f252"},"schema_version":"1.0","source":{"id":"1512.00846","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.00846","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"arxiv_version","alias_value":"1512.00846v1","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.00846","created_at":"2026-05-18T01:20:32Z"},{"alias_kind":"pith_short_12","alias_value":"MVAHQPYP2LT2","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"MVAHQPYP2LT2GUUX","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"MVAHQPYP","created_at":"2026-05-18T12:29:32Z"}],"graph_snapshots":[{"event_id":"sha256:93a1b7e07d754d0868944ab631b75189d5beec92c3a2d7f3c5966f42269a01b7","target":"graph","created_at":"2026-05-18T01:20:32Z","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 (SNe) embedded in dense circumstellar material (CSM) may show prominent emission lines in their early-time spectra ($\\leq 10$ days after the explosion), owing to recombination of the CSM ionized by the shock-breakout flash. From such spectra (\"flash spectroscopy\"), we can measure various physical properties of the CSM, as well as the mass-loss rate of the progenitor during the year prior to its explosion. Searching through the Palomar Transient Factory (PTF and iPTF) SN spectroscopy databases from 2009 through 2014, we found 12 Type II SNe showing flash-ionized (FI) signatures in th","authors_text":"A. Gal-Yam, A. Horesh, A. Rubin, A. V. Filippenko, D. A. Howell, D. Khazov, D. Perley, E. O. Ofek, F. Taddia, H. Ebeling, I. Arcavi, I. Manulis, J. Johansson, J. M. Silverman, J. Sollerman, J. Surace, M. M. Kasliwal, M. Sullivan, O. Yaron, P. E. Nugent, P. R. Wozniak, R. R. Laher, S. B. Cenko, S. R. Kulkarni, T. Matheson, U. D. Rebbapragada, Y. Cao","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-02T11:58:51Z","title":"Flash Spectroscopy: Emission Lines from the Ionized Circumstellar Material around $<10$-Day-Old Type II Supernovae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.00846","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:e27a4afa1846bbb1016f6ec3b6402b7e4ffc014d82923529e0f6b6bebb269188","target":"record","created_at":"2026-05-18T01:20:32Z","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":"3b60368debd0005a4c222d36287e6605ed446a0366334fc87fecffc4881131fc","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-12-02T11:58:51Z","title_canon_sha256":"5f02c944fbe66f49aee5dacc606a48062b6295b62398a03a5165f2c96924f252"},"schema_version":"1.0","source":{"id":"1512.00846","kind":"arxiv","version":1}},"canonical_sha256":"6540783f0fd2e7a3529765d28a4d57baadac5e7b731d9fd0a4a7a1b672ac913a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6540783f0fd2e7a3529765d28a4d57baadac5e7b731d9fd0a4a7a1b672ac913a","first_computed_at":"2026-05-18T01:20:32.916448Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:20:32.916448Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MX1fiYfzD+Ka4QPUGFat8Wg3zzBH73f2yMjUcC40RpYf3LJS0xN46FDFzlEMhBd5Hw4aWEw3BOVN3sxX7gDIDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:20:32.916859Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.00846","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e27a4afa1846bbb1016f6ec3b6402b7e4ffc014d82923529e0f6b6bebb269188","sha256:93a1b7e07d754d0868944ab631b75189d5beec92c3a2d7f3c5966f42269a01b7"],"state_sha256":"8ecc9fb3ccd449487a7616f51e8e45d9a39921987d8b4e04aa1cce7fdc8f5486"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7hi5avHjRWReYKC6rjHkJwyS+FpiBaYppt0LefW0JgM+ciZqzGnEnlDi5PumsGscfR2gM2uqLPPSuG+U1CNLAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T03:47:42.007156Z","bundle_sha256":"62ff8aeb4f35312dc75b2d5b960f5a1abd3f6d4cda260c686fe37b00f22811a4"}}