{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:U5SL6Z3OVNB2DBVBK3ZC7OV2RT","short_pith_number":"pith:U5SL6Z3O","canonical_record":{"source":{"id":"1103.3653","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-18T15:54:36Z","cross_cats_sorted":[],"title_canon_sha256":"ca6cc2cb30ff85d3253ca7074a670b89c77f8932814eac44ff0595232cec39e3","abstract_canon_sha256":"a5ccd14aab1641a853039eb54e790d2a07ca4eb8116799f847f68295e6db1239"},"schema_version":"1.0"},"canonical_sha256":"a764bf676eab43a186a156f22fbaba8cd81d9e83d93096d0a3f8880edc372374","source":{"kind":"arxiv","id":"1103.3653","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.3653","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"arxiv_version","alias_value":"1103.3653v4","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.3653","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"pith_short_12","alias_value":"U5SL6Z3OVNB2","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_16","alias_value":"U5SL6Z3OVNB2DBVB","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_8","alias_value":"U5SL6Z3O","created_at":"2026-05-18T12:26:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:U5SL6Z3OVNB2DBVBK3ZC7OV2RT","target":"record","payload":{"canonical_record":{"source":{"id":"1103.3653","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-18T15:54:36Z","cross_cats_sorted":[],"title_canon_sha256":"ca6cc2cb30ff85d3253ca7074a670b89c77f8932814eac44ff0595232cec39e3","abstract_canon_sha256":"a5ccd14aab1641a853039eb54e790d2a07ca4eb8116799f847f68295e6db1239"},"schema_version":"1.0"},"canonical_sha256":"a764bf676eab43a186a156f22fbaba8cd81d9e83d93096d0a3f8880edc372374","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:02:49.705510Z","signature_b64":"jsaFfOAws8Dsha6S5GRCEy0t2+j1ilar4SjZXCck5UE+5JD7FZwOXDJIqVANRzTJrD3DmDRf06n2hzdW1k2ICA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a764bf676eab43a186a156f22fbaba8cd81d9e83d93096d0a3f8880edc372374","last_reissued_at":"2026-05-18T02:02:49.704866Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:02:49.704866Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1103.3653","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:02:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B0yqcAIRsv7fB2QkON1evb26K+vkpdL37AXZhjREHnsFMG3Ta9cPwIALWLB5Gq+koGr39bPfKhkYCyiORyeIBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T20:00:57.924654Z"},"content_sha256":"63df6ba2ee11990ec2b16daa4ede740d9e8746ed91eae783479e53d574e390a5","schema_version":"1.0","event_id":"sha256:63df6ba2ee11990ec2b16daa4ede740d9e8746ed91eae783479e53d574e390a5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:U5SL6Z3OVNB2DBVBK3ZC7OV2RT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The 44Ti-powered spectrum of SN 1987A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Anders Jerkstrand, Cecilia Kozma, Claes Fransson","submitted_at":"2011-03-18T15:54:36Z","abstract_excerpt":"SN 1987A provides a unique opportunity to study the evolution of a supernova from explosion into very late phases. Due to the rich chemical structure, the multitude of physical process involved, and extensive radiative transfer effects, detailed modeling is needed to interpret the emission from this and other supernovae. In this paper, we analyze the late-time (~8 years) HST spectrum of the SN 1987A ejecta, where 44Ti is the dominant power source. Based on an explosion model for a 19 Msun progenitor, we compute a model spectrum by calculating the degradation of positrons and gamma-rays from th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.3653","kind":"arxiv","version":4},"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":"2026-05-18T02:02:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"10g0kiM5/mDgQBux3RsjMNTp3qv/2741vNYAjFMvNyarAbdFnDcevcQnsfC34/fgPbu1MEkUq+mhfwkqSGNZBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T20:00:57.924998Z"},"content_sha256":"34a2b87671ef27042fd3d813d17dd92c29393910755b799373246ddaf329ff46","schema_version":"1.0","event_id":"sha256:34a2b87671ef27042fd3d813d17dd92c29393910755b799373246ddaf329ff46"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U5SL6Z3OVNB2DBVBK3ZC7OV2RT/bundle.json","state_url":"https://pith.science/pith/U5SL6Z3OVNB2DBVBK3ZC7OV2RT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U5SL6Z3OVNB2DBVBK3ZC7OV2RT/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":"2026-06-01T20:00:57Z","links":{"resolver":"https://pith.science/pith/U5SL6Z3OVNB2DBVBK3ZC7OV2RT","bundle":"https://pith.science/pith/U5SL6Z3OVNB2DBVBK3ZC7OV2RT/bundle.json","state":"https://pith.science/pith/U5SL6Z3OVNB2DBVBK3ZC7OV2RT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U5SL6Z3OVNB2DBVBK3ZC7OV2RT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:U5SL6Z3OVNB2DBVBK3ZC7OV2RT","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":"a5ccd14aab1641a853039eb54e790d2a07ca4eb8116799f847f68295e6db1239","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-18T15:54:36Z","title_canon_sha256":"ca6cc2cb30ff85d3253ca7074a670b89c77f8932814eac44ff0595232cec39e3"},"schema_version":"1.0","source":{"id":"1103.3653","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1103.3653","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"arxiv_version","alias_value":"1103.3653v4","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1103.3653","created_at":"2026-05-18T02:02:49Z"},{"alias_kind":"pith_short_12","alias_value":"U5SL6Z3OVNB2","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_16","alias_value":"U5SL6Z3OVNB2DBVB","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_8","alias_value":"U5SL6Z3O","created_at":"2026-05-18T12:26:42Z"}],"graph_snapshots":[{"event_id":"sha256:34a2b87671ef27042fd3d813d17dd92c29393910755b799373246ddaf329ff46","target":"graph","created_at":"2026-05-18T02:02:49Z","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":"SN 1987A provides a unique opportunity to study the evolution of a supernova from explosion into very late phases. Due to the rich chemical structure, the multitude of physical process involved, and extensive radiative transfer effects, detailed modeling is needed to interpret the emission from this and other supernovae. In this paper, we analyze the late-time (~8 years) HST spectrum of the SN 1987A ejecta, where 44Ti is the dominant power source. Based on an explosion model for a 19 Msun progenitor, we compute a model spectrum by calculating the degradation of positrons and gamma-rays from th","authors_text":"Anders Jerkstrand, Cecilia Kozma, Claes Fransson","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-18T15:54:36Z","title":"The 44Ti-powered spectrum of SN 1987A"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.3653","kind":"arxiv","version":4},"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":"sha256:63df6ba2ee11990ec2b16daa4ede740d9e8746ed91eae783479e53d574e390a5","target":"record","created_at":"2026-05-18T02:02:49Z","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":"a5ccd14aab1641a853039eb54e790d2a07ca4eb8116799f847f68295e6db1239","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-03-18T15:54:36Z","title_canon_sha256":"ca6cc2cb30ff85d3253ca7074a670b89c77f8932814eac44ff0595232cec39e3"},"schema_version":"1.0","source":{"id":"1103.3653","kind":"arxiv","version":4}},"canonical_sha256":"a764bf676eab43a186a156f22fbaba8cd81d9e83d93096d0a3f8880edc372374","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a764bf676eab43a186a156f22fbaba8cd81d9e83d93096d0a3f8880edc372374","first_computed_at":"2026-05-18T02:02:49.704866Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:02:49.704866Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jsaFfOAws8Dsha6S5GRCEy0t2+j1ilar4SjZXCck5UE+5JD7FZwOXDJIqVANRzTJrD3DmDRf06n2hzdW1k2ICA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:02:49.705510Z","signed_message":"canonical_sha256_bytes"},"source_id":"1103.3653","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:63df6ba2ee11990ec2b16daa4ede740d9e8746ed91eae783479e53d574e390a5","sha256:34a2b87671ef27042fd3d813d17dd92c29393910755b799373246ddaf329ff46"],"state_sha256":"1bb7a66f275102b3742b8e6f114d2bc72e13f05fa58f9143d13cde50be7ae972"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dFBjdmevtvAW3/Iy8vsC0JKlunhDuWb9gg9txejIx168SwIIDN3rgFEpvFaQXvH9WVwqxGenog6ziGBvf4+VBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T20:00:57.926952Z","bundle_sha256":"5755d544dc3176d92f3ce20362a172886d2c0689ecfb85dedfefec327583d21c"}}