{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:W6GFA2UUUTBILLCDT57K4JSPXO","short_pith_number":"pith:W6GFA2UU","canonical_record":{"source":{"id":"1906.02203","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-06-05T18:00:01Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"db2bb170181b5c23a99b073792d67188dc31f5ce52db67fb2c46c63c2aa28634","abstract_canon_sha256":"2bbd5953e7dd68700e4f1a464be37f7f1c36ece500cde11808a832e5a4bb7c81"},"schema_version":"1.0"},"canonical_sha256":"b78c506a94a4c285ac439f7eae264fbbadb4835711a0d5a0a6c40d5d8d0b9725","source":{"kind":"arxiv","id":"1906.02203","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.02203","created_at":"2026-05-17T23:43:33Z"},{"alias_kind":"arxiv_version","alias_value":"1906.02203v1","created_at":"2026-05-17T23:43:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.02203","created_at":"2026-05-17T23:43:33Z"},{"alias_kind":"pith_short_12","alias_value":"W6GFA2UUUTBI","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"W6GFA2UUUTBILLCD","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"W6GFA2UU","created_at":"2026-05-18T12:33:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:W6GFA2UUUTBILLCDT57K4JSPXO","target":"record","payload":{"canonical_record":{"source":{"id":"1906.02203","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-06-05T18:00:01Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"db2bb170181b5c23a99b073792d67188dc31f5ce52db67fb2c46c63c2aa28634","abstract_canon_sha256":"2bbd5953e7dd68700e4f1a464be37f7f1c36ece500cde11808a832e5a4bb7c81"},"schema_version":"1.0"},"canonical_sha256":"b78c506a94a4c285ac439f7eae264fbbadb4835711a0d5a0a6c40d5d8d0b9725","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:43:33.978250Z","signature_b64":"PFfEYm+xheJZMtkBOlyZ4TLlOP43Ag7FDF0r6Ls7tl2AS6XVoCkfQs//HztPopwNIBaKmNYJpgC8sOVOO3R8Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b78c506a94a4c285ac439f7eae264fbbadb4835711a0d5a0a6c40d5d8d0b9725","last_reissued_at":"2026-05-17T23:43:33.977755Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:43:33.977755Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1906.02203","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":"2026-05-17T23:43:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3jx36ejv4eMRo1KndwuAUsnCeFe417sBiOu55dhoNYV1SwJ2QmwbwY5+DY+i1hFp9SNqM2zM4z4TrHksSj02BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T17:40:53.770741Z"},"content_sha256":"0e93d3a4eafac594963e4031249de2275c4a50d6985dd836dcb6d426583df505","schema_version":"1.0","event_id":"sha256:0e93d3a4eafac594963e4031249de2275c4a50d6985dd836dcb6d426583df505"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:W6GFA2UUUTBILLCDT57K4JSPXO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The dust content of the Crab Nebula","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"A. Bevan, F. Priestley, H. Chawner, H.L. Gomez, I. De Looze, M.F. Bietenholz, M.J. Barlow, M. Matsuura, R. Bandiera, R. Wesson","submitted_at":"2019-06-05T18:00:01Z","abstract_excerpt":"We have modelled the near-infrared to radio images of the Crab Nebula with a Bayesian SED model to simultaneously fit its synchrotron, interstellar and supernova dust emission. We infer an interstellar dust extinction map with an average $A_{\\text{V}}$=1.08$\\pm$0.38 mag, consistent with a small contribution (<22%) to the Crab's overall infrared emission. The Crab's supernova dust mass is estimated to be between 0.032 and 0.049 M$_{\\odot}$ (for amorphous carbon grains) with an average dust temperature $T_{\\text{dust}}$=41$\\pm$3K, corresponding to a dust condensation efficiency of 8-12%. This re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.02203","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":"2026-05-17T23:43:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kUGFOPSkr/3KfuKr9W7+LvGOX4s4NgogLVr0jIxPdX9fblTL5GBOHs5vYToAyUp/wMywzv0hTfZWpawhHpTJAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T17:40:53.771429Z"},"content_sha256":"50bb31c0776a09813c44e5e69818f562a817bf3e1538ccf8eabc8f1cf771694f","schema_version":"1.0","event_id":"sha256:50bb31c0776a09813c44e5e69818f562a817bf3e1538ccf8eabc8f1cf771694f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W6GFA2UUUTBILLCDT57K4JSPXO/bundle.json","state_url":"https://pith.science/pith/W6GFA2UUUTBILLCDT57K4JSPXO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W6GFA2UUUTBILLCDT57K4JSPXO/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":"2026-05-30T17:40:53Z","links":{"resolver":"https://pith.science/pith/W6GFA2UUUTBILLCDT57K4JSPXO","bundle":"https://pith.science/pith/W6GFA2UUUTBILLCDT57K4JSPXO/bundle.json","state":"https://pith.science/pith/W6GFA2UUUTBILLCDT57K4JSPXO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W6GFA2UUUTBILLCDT57K4JSPXO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:W6GFA2UUUTBILLCDT57K4JSPXO","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":"2bbd5953e7dd68700e4f1a464be37f7f1c36ece500cde11808a832e5a4bb7c81","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-06-05T18:00:01Z","title_canon_sha256":"db2bb170181b5c23a99b073792d67188dc31f5ce52db67fb2c46c63c2aa28634"},"schema_version":"1.0","source":{"id":"1906.02203","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.02203","created_at":"2026-05-17T23:43:33Z"},{"alias_kind":"arxiv_version","alias_value":"1906.02203v1","created_at":"2026-05-17T23:43:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.02203","created_at":"2026-05-17T23:43:33Z"},{"alias_kind":"pith_short_12","alias_value":"W6GFA2UUUTBI","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"W6GFA2UUUTBILLCD","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"W6GFA2UU","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:50bb31c0776a09813c44e5e69818f562a817bf3e1538ccf8eabc8f1cf771694f","target":"graph","created_at":"2026-05-17T23:43:33Z","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 have modelled the near-infrared to radio images of the Crab Nebula with a Bayesian SED model to simultaneously fit its synchrotron, interstellar and supernova dust emission. We infer an interstellar dust extinction map with an average $A_{\\text{V}}$=1.08$\\pm$0.38 mag, consistent with a small contribution (<22%) to the Crab's overall infrared emission. The Crab's supernova dust mass is estimated to be between 0.032 and 0.049 M$_{\\odot}$ (for amorphous carbon grains) with an average dust temperature $T_{\\text{dust}}$=41$\\pm$3K, corresponding to a dust condensation efficiency of 8-12%. This re","authors_text":"A. Bevan, F. Priestley, H. Chawner, H.L. Gomez, I. De Looze, M.F. Bietenholz, M.J. Barlow, M. Matsuura, R. Bandiera, R. Wesson","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-06-05T18:00:01Z","title":"The dust content of the Crab Nebula"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.02203","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":"sha256:0e93d3a4eafac594963e4031249de2275c4a50d6985dd836dcb6d426583df505","target":"record","created_at":"2026-05-17T23:43:33Z","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":"2bbd5953e7dd68700e4f1a464be37f7f1c36ece500cde11808a832e5a4bb7c81","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-06-05T18:00:01Z","title_canon_sha256":"db2bb170181b5c23a99b073792d67188dc31f5ce52db67fb2c46c63c2aa28634"},"schema_version":"1.0","source":{"id":"1906.02203","kind":"arxiv","version":1}},"canonical_sha256":"b78c506a94a4c285ac439f7eae264fbbadb4835711a0d5a0a6c40d5d8d0b9725","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b78c506a94a4c285ac439f7eae264fbbadb4835711a0d5a0a6c40d5d8d0b9725","first_computed_at":"2026-05-17T23:43:33.977755Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:43:33.977755Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PFfEYm+xheJZMtkBOlyZ4TLlOP43Ag7FDF0r6Ls7tl2AS6XVoCkfQs//HztPopwNIBaKmNYJpgC8sOVOO3R8Aw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:43:33.978250Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.02203","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e93d3a4eafac594963e4031249de2275c4a50d6985dd836dcb6d426583df505","sha256:50bb31c0776a09813c44e5e69818f562a817bf3e1538ccf8eabc8f1cf771694f"],"state_sha256":"e9289ca3d07fcd66f9bacb3c2ab93b4aa651d31b43d459d8b33371246fb10131"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N32oJMWn3wakKP9C5vSVvTBCyVPAewdBc5/C7oDpR23QZ+bfVYxnNWdEv50brQvsdagSAW+0bpuHF/7US015Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T17:40:53.775053Z","bundle_sha256":"b26a5753a0e92f7d892c7d9322bec10879a693b6107959b2ce52c429f6fdf4fd"}}