{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:ZSBG6KHZXD3I23JGMATPSUXBD6","short_pith_number":"pith:ZSBG6KHZ","canonical_record":{"source":{"id":"1109.6252","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-09-28T15:59:55Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"d4a982e8f4f204306e5a4e619af3b60d23d8cd8c1a2fa12c44e9c3076d8539eb","abstract_canon_sha256":"52b16ccb1950e17c7104531739e7bb10b1fa93a221fba76e401f169150d9f97f"},"schema_version":"1.0"},"canonical_sha256":"cc826f28f9b8f68d6d266026f952e11f8d617b9a3b54100627f9e2ee298523a5","source":{"kind":"arxiv","id":"1109.6252","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.6252","created_at":"2026-05-18T02:00:22Z"},{"alias_kind":"arxiv_version","alias_value":"1109.6252v1","created_at":"2026-05-18T02:00:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.6252","created_at":"2026-05-18T02:00:22Z"},{"alias_kind":"pith_short_12","alias_value":"ZSBG6KHZXD3I","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"ZSBG6KHZXD3I23JG","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"ZSBG6KHZ","created_at":"2026-05-18T12:26:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:ZSBG6KHZXD3I23JGMATPSUXBD6","target":"record","payload":{"canonical_record":{"source":{"id":"1109.6252","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-09-28T15:59:55Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"d4a982e8f4f204306e5a4e619af3b60d23d8cd8c1a2fa12c44e9c3076d8539eb","abstract_canon_sha256":"52b16ccb1950e17c7104531739e7bb10b1fa93a221fba76e401f169150d9f97f"},"schema_version":"1.0"},"canonical_sha256":"cc826f28f9b8f68d6d266026f952e11f8d617b9a3b54100627f9e2ee298523a5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:22.034086Z","signature_b64":"lSGK2PlsVS2wPiCvH2ycZJpep5X2ej8sb8rmlWgNK5vm/KSV8uempsRRZoJuUQYwCQVGEBc/xX+YF0so9891Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cc826f28f9b8f68d6d266026f952e11f8d617b9a3b54100627f9e2ee298523a5","last_reissued_at":"2026-05-18T02:00:22.033558Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:22.033558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1109.6252","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":"2026-05-18T02:00:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EjfnBFxCdc/E4DDReRdTZLGXq2xDsEJF+EJhrxjr3BxcN4C6vn2IfCn/+subzOVa4cKaCrqIdhnB8mDJ7Qa6AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T13:03:02.339035Z"},"content_sha256":"53d69d0b55ea8d6fa77eedb7d79c2ad068ce04295b045d6261972fcbc8cf109a","schema_version":"1.0","event_id":"sha256:53d69d0b55ea8d6fa77eedb7d79c2ad068ce04295b045d6261972fcbc8cf109a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:ZSBG6KHZXD3I23JGMATPSUXBD6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical Polarization and Spectral Variability in the M87 Jet","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"C. C. Cheung (NRL), D. E. Harris (CfA), Eric Clausen-Brown (Purdue), Eric S. Perlman (FIT), GSFC), John A. Biretta (STScI), Juan P. Madrid (Swinburne), Lukasz Stawarz (JAXA), Markos Georganopoulos (UMBC, Matthew Bourque (FIT), Mihai Cara (FIT), Raymond C. Simons (FIT), Steven C. Adams (U. Georgia), William B. Sparks (STScI)","submitted_at":"2011-09-28T15:59:55Z","abstract_excerpt":"During the last decade, M87's jet has been the site of an extraordinary variability event, with one knot (HST-1) increasing by over a factor 100 in brightness. Variability was also seen on timescales of months in the nuclear flux. Here we discuss the optical-UV polarization and spectral variability of these components, which show vastly different behavior. HST-1 shows a highly significant correlation between flux and polarization, with P increasing from $\\sim 20%$ at minimum to >40% at maximum, while the orientation of its electric vector stayed constant. HST-1's optical-UV spectrum is very ha"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.6252","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":"2026-05-18T02:00:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fVUT4ya1gkkxkxYawc2vpApmlMPYOy4skoC3ti+GRKdmNPJ5fbKqrTGHD9wB/MHEi4DmHOaawF5HP0WCrqToAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T13:03:02.339764Z"},"content_sha256":"37de4320f5dabb2245840cbd4ba3d163f395fc113285dd05a4a1526e577c5be5","schema_version":"1.0","event_id":"sha256:37de4320f5dabb2245840cbd4ba3d163f395fc113285dd05a4a1526e577c5be5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZSBG6KHZXD3I23JGMATPSUXBD6/bundle.json","state_url":"https://pith.science/pith/ZSBG6KHZXD3I23JGMATPSUXBD6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZSBG6KHZXD3I23JGMATPSUXBD6/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":"2026-05-22T13:03:02Z","links":{"resolver":"https://pith.science/pith/ZSBG6KHZXD3I23JGMATPSUXBD6","bundle":"https://pith.science/pith/ZSBG6KHZXD3I23JGMATPSUXBD6/bundle.json","state":"https://pith.science/pith/ZSBG6KHZXD3I23JGMATPSUXBD6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZSBG6KHZXD3I23JGMATPSUXBD6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:ZSBG6KHZXD3I23JGMATPSUXBD6","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":"52b16ccb1950e17c7104531739e7bb10b1fa93a221fba76e401f169150d9f97f","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-09-28T15:59:55Z","title_canon_sha256":"d4a982e8f4f204306e5a4e619af3b60d23d8cd8c1a2fa12c44e9c3076d8539eb"},"schema_version":"1.0","source":{"id":"1109.6252","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1109.6252","created_at":"2026-05-18T02:00:22Z"},{"alias_kind":"arxiv_version","alias_value":"1109.6252v1","created_at":"2026-05-18T02:00:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1109.6252","created_at":"2026-05-18T02:00:22Z"},{"alias_kind":"pith_short_12","alias_value":"ZSBG6KHZXD3I","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"ZSBG6KHZXD3I23JG","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"ZSBG6KHZ","created_at":"2026-05-18T12:26:50Z"}],"graph_snapshots":[{"event_id":"sha256:37de4320f5dabb2245840cbd4ba3d163f395fc113285dd05a4a1526e577c5be5","target":"graph","created_at":"2026-05-18T02:00:22Z","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":"During the last decade, M87's jet has been the site of an extraordinary variability event, with one knot (HST-1) increasing by over a factor 100 in brightness. Variability was also seen on timescales of months in the nuclear flux. Here we discuss the optical-UV polarization and spectral variability of these components, which show vastly different behavior. HST-1 shows a highly significant correlation between flux and polarization, with P increasing from $\\sim 20%$ at minimum to >40% at maximum, while the orientation of its electric vector stayed constant. HST-1's optical-UV spectrum is very ha","authors_text":"C. C. Cheung (NRL), D. E. Harris (CfA), Eric Clausen-Brown (Purdue), Eric S. Perlman (FIT), GSFC), John A. Biretta (STScI), Juan P. Madrid (Swinburne), Lukasz Stawarz (JAXA), Markos Georganopoulos (UMBC, Matthew Bourque (FIT), Mihai Cara (FIT), Raymond C. Simons (FIT), Steven C. Adams (U. Georgia), William B. Sparks (STScI)","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-09-28T15:59:55Z","title":"Optical Polarization and Spectral Variability in the M87 Jet"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1109.6252","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":"sha256:53d69d0b55ea8d6fa77eedb7d79c2ad068ce04295b045d6261972fcbc8cf109a","target":"record","created_at":"2026-05-18T02:00:22Z","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":"52b16ccb1950e17c7104531739e7bb10b1fa93a221fba76e401f169150d9f97f","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-09-28T15:59:55Z","title_canon_sha256":"d4a982e8f4f204306e5a4e619af3b60d23d8cd8c1a2fa12c44e9c3076d8539eb"},"schema_version":"1.0","source":{"id":"1109.6252","kind":"arxiv","version":1}},"canonical_sha256":"cc826f28f9b8f68d6d266026f952e11f8d617b9a3b54100627f9e2ee298523a5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cc826f28f9b8f68d6d266026f952e11f8d617b9a3b54100627f9e2ee298523a5","first_computed_at":"2026-05-18T02:00:22.033558Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:22.033558Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lSGK2PlsVS2wPiCvH2ycZJpep5X2ej8sb8rmlWgNK5vm/KSV8uempsRRZoJuUQYwCQVGEBc/xX+YF0so9891Dg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:22.034086Z","signed_message":"canonical_sha256_bytes"},"source_id":"1109.6252","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:53d69d0b55ea8d6fa77eedb7d79c2ad068ce04295b045d6261972fcbc8cf109a","sha256:37de4320f5dabb2245840cbd4ba3d163f395fc113285dd05a4a1526e577c5be5"],"state_sha256":"f5548b70bc99d234d2b2280c251ad2c8e78df4aaf2ca4a22c4c2d430b16569d0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TqjaVQZx5z8tTFdNCwmczQuFZYzPhpafoQFh7xktPzBZ3A2WH7bgRbZauhTud6nmER/9yVzkUByWvtqellV9DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T13:03:02.343432Z","bundle_sha256":"9811008f6169ef1845e7aeae8815608105b80a06e54677bb4726aad95b8fe309"}}