{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:FKVBX5MMACRXY2MZHAMVQM6YHZ","short_pith_number":"pith:FKVBX5MM","canonical_record":{"source":{"id":"1802.07254","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-20T18:59:59Z","cross_cats_sorted":[],"title_canon_sha256":"884953bad74e13699714c3eeaddf2b791b46aac0529fac58d8b5c53637a4594f","abstract_canon_sha256":"274ed40d24cd6fce2badd77af3bfde61a46be3a86685c1296640273fead26e27"},"schema_version":"1.0"},"canonical_sha256":"2aaa1bf58c00a37c699938195833d83e5c4a6735156b4c1a1e2ff9b8a7d2c887","source":{"kind":"arxiv","id":"1802.07254","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07254","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07254v1","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07254","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"pith_short_12","alias_value":"FKVBX5MMACRX","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"FKVBX5MMACRXY2MZ","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"FKVBX5MM","created_at":"2026-05-18T12:32:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:FKVBX5MMACRXY2MZHAMVQM6YHZ","target":"record","payload":{"canonical_record":{"source":{"id":"1802.07254","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-20T18:59:59Z","cross_cats_sorted":[],"title_canon_sha256":"884953bad74e13699714c3eeaddf2b791b46aac0529fac58d8b5c53637a4594f","abstract_canon_sha256":"274ed40d24cd6fce2badd77af3bfde61a46be3a86685c1296640273fead26e27"},"schema_version":"1.0"},"canonical_sha256":"2aaa1bf58c00a37c699938195833d83e5c4a6735156b4c1a1e2ff9b8a7d2c887","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:21:05.838567Z","signature_b64":"+RoSVsIrHYcIb6YmlkhNTLdPSJY1REkUYDoZ7Lv1RXFkai3QkOFua+J6Az+xf7YhofCr4TqJKACUOjl1XhzLBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2aaa1bf58c00a37c699938195833d83e5c4a6735156b4c1a1e2ff9b8a7d2c887","last_reissued_at":"2026-05-18T00:21:05.838030Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:21:05.838030Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.07254","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":"2026-05-18T00:21:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v+EYtOcZ1h4Nl5Fb2SVCfk/IslQqi2yigRV8koOhhJTXqTY9X8PXmmeyYsTpqPrCQDq3nJvDlH0xL4TvNC8uCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:15:13.948200Z"},"content_sha256":"3f87ddd4affc3eac7b2049c5fe03a01616dc42507385998bdcfe57344e0219ed","schema_version":"1.0","event_id":"sha256:3f87ddd4affc3eac7b2049c5fe03a01616dc42507385998bdcfe57344e0219ed"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:FKVBX5MMACRXY2MZHAMVQM6YHZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observed Type II supernova colours from the Carnegie Supernova Project-I","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A.V. Filippenko, C. Contreras, C. P. Guti\\'errez, E. Y. Hsiao, G. Folatelli, J. P. Anderson, L. Dessart, L. Galbany, M. D. Stritzinger, M. Hamuy, M. M. Phillips, N. B. Suntzeff, N. Morrell, S. Gonz\\'alez-Gait\\'an, T. de Jaeger","submitted_at":"2018-02-20T18:59:59Z","abstract_excerpt":"We present a study of observed Type II supernova (SN~II) colours using optical/near-infrared photometric data from the \\textit{Carnegie Supernovae Project-I}. We analyse four colours ($B-V$, $u-g$, $g-r$, and $g-Y$) and find that SN~II colour curves can be described by two linear regimes during the photospheric phase. The first ($s_{\\rm 1,colour}$) is steeper and has a median duration of $\\sim 40$ days. The second, shallower slope ($s_{\\rm 2,colour}$) lasts until the end of the \"plateau\" ($\\sim 80$ days). The two slopes correlate in the sense that steeper initial colour curves also imply steep"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07254","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":"2026-05-18T00:21:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SglnLbITO7sqYNglD4FiPUi/ZCU2//5oYEbaO+W/g/hH/prqjyph3Gp2C0Bu6twytrPHKPoZ99wT4tglWr+dAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T17:15:13.948569Z"},"content_sha256":"f014723a8f304afc314ea90e864e109cfeef2b84165bc8450f2360c36e5070e1","schema_version":"1.0","event_id":"sha256:f014723a8f304afc314ea90e864e109cfeef2b84165bc8450f2360c36e5070e1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FKVBX5MMACRXY2MZHAMVQM6YHZ/bundle.json","state_url":"https://pith.science/pith/FKVBX5MMACRXY2MZHAMVQM6YHZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FKVBX5MMACRXY2MZHAMVQM6YHZ/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":"2026-06-03T17:15:13Z","links":{"resolver":"https://pith.science/pith/FKVBX5MMACRXY2MZHAMVQM6YHZ","bundle":"https://pith.science/pith/FKVBX5MMACRXY2MZHAMVQM6YHZ/bundle.json","state":"https://pith.science/pith/FKVBX5MMACRXY2MZHAMVQM6YHZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FKVBX5MMACRXY2MZHAMVQM6YHZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:FKVBX5MMACRXY2MZHAMVQM6YHZ","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":"274ed40d24cd6fce2badd77af3bfde61a46be3a86685c1296640273fead26e27","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-20T18:59:59Z","title_canon_sha256":"884953bad74e13699714c3eeaddf2b791b46aac0529fac58d8b5c53637a4594f"},"schema_version":"1.0","source":{"id":"1802.07254","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07254","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07254v1","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07254","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"pith_short_12","alias_value":"FKVBX5MMACRX","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"FKVBX5MMACRXY2MZ","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"FKVBX5MM","created_at":"2026-05-18T12:32:22Z"}],"graph_snapshots":[{"event_id":"sha256:f014723a8f304afc314ea90e864e109cfeef2b84165bc8450f2360c36e5070e1","target":"graph","created_at":"2026-05-18T00:21:05Z","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 a study of observed Type II supernova (SN~II) colours using optical/near-infrared photometric data from the \\textit{Carnegie Supernovae Project-I}. We analyse four colours ($B-V$, $u-g$, $g-r$, and $g-Y$) and find that SN~II colour curves can be described by two linear regimes during the photospheric phase. The first ($s_{\\rm 1,colour}$) is steeper and has a median duration of $\\sim 40$ days. The second, shallower slope ($s_{\\rm 2,colour}$) lasts until the end of the \"plateau\" ($\\sim 80$ days). The two slopes correlate in the sense that steeper initial colour curves also imply steep","authors_text":"A.V. Filippenko, C. Contreras, C. P. Guti\\'errez, E. Y. Hsiao, G. Folatelli, J. P. Anderson, L. Dessart, L. Galbany, M. D. Stritzinger, M. Hamuy, M. M. Phillips, N. B. Suntzeff, N. Morrell, S. Gonz\\'alez-Gait\\'an, T. de Jaeger","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-20T18:59:59Z","title":"Observed Type II supernova colours from the Carnegie Supernova Project-I"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07254","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":"sha256:3f87ddd4affc3eac7b2049c5fe03a01616dc42507385998bdcfe57344e0219ed","target":"record","created_at":"2026-05-18T00:21:05Z","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":"274ed40d24cd6fce2badd77af3bfde61a46be3a86685c1296640273fead26e27","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-20T18:59:59Z","title_canon_sha256":"884953bad74e13699714c3eeaddf2b791b46aac0529fac58d8b5c53637a4594f"},"schema_version":"1.0","source":{"id":"1802.07254","kind":"arxiv","version":1}},"canonical_sha256":"2aaa1bf58c00a37c699938195833d83e5c4a6735156b4c1a1e2ff9b8a7d2c887","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2aaa1bf58c00a37c699938195833d83e5c4a6735156b4c1a1e2ff9b8a7d2c887","first_computed_at":"2026-05-18T00:21:05.838030Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:21:05.838030Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+RoSVsIrHYcIb6YmlkhNTLdPSJY1REkUYDoZ7Lv1RXFkai3QkOFua+J6Az+xf7YhofCr4TqJKACUOjl1XhzLBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:21:05.838567Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.07254","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3f87ddd4affc3eac7b2049c5fe03a01616dc42507385998bdcfe57344e0219ed","sha256:f014723a8f304afc314ea90e864e109cfeef2b84165bc8450f2360c36e5070e1"],"state_sha256":"3f3e79f058db9bd63e0d875ebea0f5eab9907e2860771a59454de276189e19f9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D7cs/jiL3Qky/HfJHBTpS2mvGeSFYJUgDFQRr/4PE+RxwrLnxsou1iX1OZ7vIE9dxG/s6w+93NFpl3PQQfc9AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T17:15:13.950527Z","bundle_sha256":"96e1e52a8ea7456df566301fefabda44cec15c42b188df73ca9f585a8b59f6b4"}}