{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:ZRJDPQSJ7OLKHCI6QHHUDOAGIW","short_pith_number":"pith:ZRJDPQSJ","canonical_record":{"source":{"id":"astro-ph/0703289","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-12T23:04:36Z","cross_cats_sorted":[],"title_canon_sha256":"899f2ad16c752d09e2aee30ff256547f4ad1fc24f0ee3cfb2194adffd8bc99ca","abstract_canon_sha256":"2f814efcbf0b2f95c2140e4ba21c55620c46749e4d3fc7fd94f0161b6bc13aff"},"schema_version":"1.0"},"canonical_sha256":"cc5237c249fb96a3891e81cf41b80645917b9a8009640b1e6f7f5218117b597b","source":{"kind":"arxiv","id":"astro-ph/0703289","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0703289","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0703289v1","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0703289","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"pith_short_12","alias_value":"ZRJDPQSJ7OLK","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"ZRJDPQSJ7OLKHCI6","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"ZRJDPQSJ","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:ZRJDPQSJ7OLKHCI6QHHUDOAGIW","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0703289","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-12T23:04:36Z","cross_cats_sorted":[],"title_canon_sha256":"899f2ad16c752d09e2aee30ff256547f4ad1fc24f0ee3cfb2194adffd8bc99ca","abstract_canon_sha256":"2f814efcbf0b2f95c2140e4ba21c55620c46749e4d3fc7fd94f0161b6bc13aff"},"schema_version":"1.0"},"canonical_sha256":"cc5237c249fb96a3891e81cf41b80645917b9a8009640b1e6f7f5218117b597b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:05.727978Z","signature_b64":"tcMHs13JKQBjgXGbJJi1uhdk/3DUr09eKW4Moa3Gd56FTvcyuJq4Vut/wjr3aWvo8YCIToyzxEf5flNHRBzWBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cc5237c249fb96a3891e81cf41b80645917b9a8009640b1e6f7f5218117b597b","last_reissued_at":"2026-05-18T04:29:05.727352Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:05.727352Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0703289","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":"2026-05-18T04:29:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9qMAWKJiMpxA0iAaH8ADyCb7IyOF4gm07SXOAZID4VHDKZQBOhLhg/UsdhK4EH6HDQjUbY8zQX3YfVnFIoIQAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T19:20:34.713271Z"},"content_sha256":"5eedf4d217f64b73f0611c8694238139b851fc7a7f2917ba0264a9819a77b24c","schema_version":"1.0","event_id":"sha256:5eedf4d217f64b73f0611c8694238139b851fc7a7f2917ba0264a9819a77b24c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:ZRJDPQSJ7OLKHCI6QHHUDOAGIW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Highly Polarized Optically-Selected BL Lacertae Objects","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) MMTO, Aleksandar M. Diamond-Stanic (1), Dennis L. Means (1) ((1) Steward Observatory, Gary D. Schmidt (1), G. Grant Williams (2), Paul S. Smith (1), The University of Arizona, The University of Arizona)","submitted_at":"2007-03-12T23:04:36Z","abstract_excerpt":"Observations of candidate BL Lacertae objects spectroscopically selected from the Sloan Digital Sky Survey (SDSS) reveal a large fraction with high polarization (P > 3%). This result confirms that synchrotron radiation makes an important contribution to the observed optical continuum for most objects in the sample. The SDSS sample can be divided into separate categories, with objects of undetermined redshift generally having the highest optical polarization. Polarization as high as 23% and the lack of spectral features suggests that the synchrotron continuum completely dominates the spectra of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0703289","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":"2026-05-18T04:29:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GIioCje0ubhtS4HeXSXCSJ6Xij2uao3zCz+RjjKIxUfWqePMgBjXjH9lgxnZZPW2ORtWxPoVs+rwrClIzDOaDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T19:20:34.713909Z"},"content_sha256":"4789e8b6c521a27fc62977d743e0504e48f15d82b62345deda8535b657d9b59c","schema_version":"1.0","event_id":"sha256:4789e8b6c521a27fc62977d743e0504e48f15d82b62345deda8535b657d9b59c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZRJDPQSJ7OLKHCI6QHHUDOAGIW/bundle.json","state_url":"https://pith.science/pith/ZRJDPQSJ7OLKHCI6QHHUDOAGIW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZRJDPQSJ7OLKHCI6QHHUDOAGIW/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":"2026-06-05T19:20:34Z","links":{"resolver":"https://pith.science/pith/ZRJDPQSJ7OLKHCI6QHHUDOAGIW","bundle":"https://pith.science/pith/ZRJDPQSJ7OLKHCI6QHHUDOAGIW/bundle.json","state":"https://pith.science/pith/ZRJDPQSJ7OLKHCI6QHHUDOAGIW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZRJDPQSJ7OLKHCI6QHHUDOAGIW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:ZRJDPQSJ7OLKHCI6QHHUDOAGIW","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":"2f814efcbf0b2f95c2140e4ba21c55620c46749e4d3fc7fd94f0161b6bc13aff","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-12T23:04:36Z","title_canon_sha256":"899f2ad16c752d09e2aee30ff256547f4ad1fc24f0ee3cfb2194adffd8bc99ca"},"schema_version":"1.0","source":{"id":"astro-ph/0703289","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0703289","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0703289v1","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0703289","created_at":"2026-05-18T04:29:05Z"},{"alias_kind":"pith_short_12","alias_value":"ZRJDPQSJ7OLK","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"ZRJDPQSJ7OLKHCI6","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"ZRJDPQSJ","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:4789e8b6c521a27fc62977d743e0504e48f15d82b62345deda8535b657d9b59c","target":"graph","created_at":"2026-05-18T04:29:05Z","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":"Observations of candidate BL Lacertae objects spectroscopically selected from the Sloan Digital Sky Survey (SDSS) reveal a large fraction with high polarization (P > 3%). This result confirms that synchrotron radiation makes an important contribution to the observed optical continuum for most objects in the sample. The SDSS sample can be divided into separate categories, with objects of undetermined redshift generally having the highest optical polarization. Polarization as high as 23% and the lack of spectral features suggests that the synchrotron continuum completely dominates the spectra of","authors_text":"(2) MMTO, Aleksandar M. Diamond-Stanic (1), Dennis L. Means (1) ((1) Steward Observatory, Gary D. Schmidt (1), G. Grant Williams (2), Paul S. Smith (1), The University of Arizona, The University of Arizona)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-03-12T23:04:36Z","title":"Highly Polarized Optically-Selected BL Lacertae Objects"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0703289","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":"sha256:5eedf4d217f64b73f0611c8694238139b851fc7a7f2917ba0264a9819a77b24c","target":"record","created_at":"2026-05-18T04:29:05Z","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":"2f814efcbf0b2f95c2140e4ba21c55620c46749e4d3fc7fd94f0161b6bc13aff","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-12T23:04:36Z","title_canon_sha256":"899f2ad16c752d09e2aee30ff256547f4ad1fc24f0ee3cfb2194adffd8bc99ca"},"schema_version":"1.0","source":{"id":"astro-ph/0703289","kind":"arxiv","version":1}},"canonical_sha256":"cc5237c249fb96a3891e81cf41b80645917b9a8009640b1e6f7f5218117b597b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cc5237c249fb96a3891e81cf41b80645917b9a8009640b1e6f7f5218117b597b","first_computed_at":"2026-05-18T04:29:05.727352Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:05.727352Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tcMHs13JKQBjgXGbJJi1uhdk/3DUr09eKW4Moa3Gd56FTvcyuJq4Vut/wjr3aWvo8YCIToyzxEf5flNHRBzWBg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:05.727978Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0703289","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5eedf4d217f64b73f0611c8694238139b851fc7a7f2917ba0264a9819a77b24c","sha256:4789e8b6c521a27fc62977d743e0504e48f15d82b62345deda8535b657d9b59c"],"state_sha256":"1bdaacbdd1e0caba99d0d8ecb5231f17da22d80d757d309ff34426beb1cdf0a5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ml4uMnuSd33EScpplRn9n3FmkkruLA0YxabIkaZ9lMNY89h4okleJ3slOCt4bzRlxtMwvPNQG67oW22fl55HBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T19:20:34.717148Z","bundle_sha256":"182d150a48e9d81ca228d9668468d685bb3289e34c3f53c8d5113151e2983e39"}}