{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:Z4AVUX36DPY6U5WYJ4Y462LN3U","short_pith_number":"pith:Z4AVUX36","canonical_record":{"source":{"id":"astro-ph/0701311","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-01-10T20:55:14Z","cross_cats_sorted":[],"title_canon_sha256":"f8cbd6eb8853834bc734e0d749e76e3022280e1d6fb47e6e77de6cc494323b9c","abstract_canon_sha256":"c847bef7e3cdcf4a96070fbd27d04662207a7af4d5a41220085ca9f7cd657655"},"schema_version":"1.0"},"canonical_sha256":"cf015a5f7e1bf1ea76d84f31cf696ddd3d05774f37c335ef84ea0c0b9024c139","source":{"kind":"arxiv","id":"astro-ph/0701311","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0701311","created_at":"2026-05-18T04:29:07Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0701311v1","created_at":"2026-05-18T04:29:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0701311","created_at":"2026-05-18T04:29:07Z"},{"alias_kind":"pith_short_12","alias_value":"Z4AVUX36DPY6","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"Z4AVUX36DPY6U5WY","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"Z4AVUX36","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:Z4AVUX36DPY6U5WYJ4Y462LN3U","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0701311","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-01-10T20:55:14Z","cross_cats_sorted":[],"title_canon_sha256":"f8cbd6eb8853834bc734e0d749e76e3022280e1d6fb47e6e77de6cc494323b9c","abstract_canon_sha256":"c847bef7e3cdcf4a96070fbd27d04662207a7af4d5a41220085ca9f7cd657655"},"schema_version":"1.0"},"canonical_sha256":"cf015a5f7e1bf1ea76d84f31cf696ddd3d05774f37c335ef84ea0c0b9024c139","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:07.462179Z","signature_b64":"K7js7VMXPMuDFLv5pVrp13OGt1UAlu3dwHQMpPJhnp3UFNsouHMh6zSPHhE3APSePe89mISYw3p+XEAMVnMMAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf015a5f7e1bf1ea76d84f31cf696ddd3d05774f37c335ef84ea0c0b9024c139","last_reissued_at":"2026-05-18T04:29:07.461299Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:07.461299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0701311","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":"2026-05-18T04:29:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Teg0QWMemLVOYeNDhIFoxyvyepDNcU5TXg3yCD1CHoGQ2EeLfksoReQKGp/p3vOFwbtEXOnI9mj80vzezpowBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T02:21:50.662144Z"},"content_sha256":"b8517d18e114886a68cb7069394dd663f8509af439dd7e189ec637dbc8f3a93c","schema_version":"1.0","event_id":"sha256:b8517d18e114886a68cb7069394dd663f8509af439dd7e189ec637dbc8f3a93c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:Z4AVUX36DPY6U5WYJ4Y462LN3U","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The pre-shock gas of SN1006 from HST/ACS observations","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"J.C. Raymond, K.E. Korreck, P. Ghavamian, Q.C. Sedlacek, R. Sankrit, W.P. Blair","submitted_at":"2007-01-10T20:55:14Z","abstract_excerpt":"We derive the pre-shock density and scale length along the line of sight for the collisionless shock from a deep HST image that resolves the H alpha filament in SN1006 and updated model calculations. The very deep ACS high-resolution image of the Balmer line filament in the northwest (NW) quadrant shows that 0.25 < n_0 < le$ 0.4 cm-3 and that the scale along the line of sight is about 2 x 10^{18} cm, while bright features within the filament correspond to ripples with radii of curvature less than 1/10 that size. The derived densities are within the broad range of earlier density estimates, and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0701311","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":"2026-05-18T04:29:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ipMJbzCesSw8hkFYVUaLy7Im4xgM41lqTqCwwbduuGcBL1ylPIz509yWahnRF2Kfmu6nDHvbXLQ74IsHhnyQDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T02:21:50.662929Z"},"content_sha256":"7be14fe13e6aad4f38845a4fb1a33d84ebc318d081828f6a83ac82768d5b62da","schema_version":"1.0","event_id":"sha256:7be14fe13e6aad4f38845a4fb1a33d84ebc318d081828f6a83ac82768d5b62da"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z4AVUX36DPY6U5WYJ4Y462LN3U/bundle.json","state_url":"https://pith.science/pith/Z4AVUX36DPY6U5WYJ4Y462LN3U/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z4AVUX36DPY6U5WYJ4Y462LN3U/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":"2026-06-12T02:21:50Z","links":{"resolver":"https://pith.science/pith/Z4AVUX36DPY6U5WYJ4Y462LN3U","bundle":"https://pith.science/pith/Z4AVUX36DPY6U5WYJ4Y462LN3U/bundle.json","state":"https://pith.science/pith/Z4AVUX36DPY6U5WYJ4Y462LN3U/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z4AVUX36DPY6U5WYJ4Y462LN3U/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:Z4AVUX36DPY6U5WYJ4Y462LN3U","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":"c847bef7e3cdcf4a96070fbd27d04662207a7af4d5a41220085ca9f7cd657655","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-01-10T20:55:14Z","title_canon_sha256":"f8cbd6eb8853834bc734e0d749e76e3022280e1d6fb47e6e77de6cc494323b9c"},"schema_version":"1.0","source":{"id":"astro-ph/0701311","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0701311","created_at":"2026-05-18T04:29:07Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0701311v1","created_at":"2026-05-18T04:29:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0701311","created_at":"2026-05-18T04:29:07Z"},{"alias_kind":"pith_short_12","alias_value":"Z4AVUX36DPY6","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"Z4AVUX36DPY6U5WY","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"Z4AVUX36","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:7be14fe13e6aad4f38845a4fb1a33d84ebc318d081828f6a83ac82768d5b62da","target":"graph","created_at":"2026-05-18T04:29:07Z","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 derive the pre-shock density and scale length along the line of sight for the collisionless shock from a deep HST image that resolves the H alpha filament in SN1006 and updated model calculations. The very deep ACS high-resolution image of the Balmer line filament in the northwest (NW) quadrant shows that 0.25 < n_0 < le$ 0.4 cm-3 and that the scale along the line of sight is about 2 x 10^{18} cm, while bright features within the filament correspond to ripples with radii of curvature less than 1/10 that size. The derived densities are within the broad range of earlier density estimates, and","authors_text":"J.C. Raymond, K.E. Korreck, P. Ghavamian, Q.C. Sedlacek, R. Sankrit, W.P. Blair","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-01-10T20:55:14Z","title":"The pre-shock gas of SN1006 from HST/ACS observations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0701311","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:b8517d18e114886a68cb7069394dd663f8509af439dd7e189ec637dbc8f3a93c","target":"record","created_at":"2026-05-18T04:29:07Z","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":"c847bef7e3cdcf4a96070fbd27d04662207a7af4d5a41220085ca9f7cd657655","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-01-10T20:55:14Z","title_canon_sha256":"f8cbd6eb8853834bc734e0d749e76e3022280e1d6fb47e6e77de6cc494323b9c"},"schema_version":"1.0","source":{"id":"astro-ph/0701311","kind":"arxiv","version":1}},"canonical_sha256":"cf015a5f7e1bf1ea76d84f31cf696ddd3d05774f37c335ef84ea0c0b9024c139","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cf015a5f7e1bf1ea76d84f31cf696ddd3d05774f37c335ef84ea0c0b9024c139","first_computed_at":"2026-05-18T04:29:07.461299Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:07.461299Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K7js7VMXPMuDFLv5pVrp13OGt1UAlu3dwHQMpPJhnp3UFNsouHMh6zSPHhE3APSePe89mISYw3p+XEAMVnMMAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:07.462179Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0701311","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b8517d18e114886a68cb7069394dd663f8509af439dd7e189ec637dbc8f3a93c","sha256:7be14fe13e6aad4f38845a4fb1a33d84ebc318d081828f6a83ac82768d5b62da"],"state_sha256":"5baf11fb7cea48767b177a603e4a9a38e73257c7049733dc512929c6b8d1a8f5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0UbKnO7ns1e6BsBAbNZkmIH+s12hIEgGn8CP693BiMztmkEJ5hApzrCnyENWXP7xoc9Y45ORnPUeoW5xzMWVDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-12T02:21:50.667495Z","bundle_sha256":"a99b08436e75af5d28744bee0c8a4cc93b56cbe5838bd026622ce48055cd4ab5"}}