{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:JIZUZ4FKBENXFXK6WVSOMXHWEL","short_pith_number":"pith:JIZUZ4FK","canonical_record":{"source":{"id":"1301.0323","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-01-02T21:00:02Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"cc725043684c881f46f9c4945a9e78ef73c4054b3c7b4f32a67fb1ea8b95c84b","abstract_canon_sha256":"5a26b20bd8f76b48a3f5038856d52f3daf7166210eb871319de00e7db1acb261"},"schema_version":"1.0"},"canonical_sha256":"4a334cf0aa091b72dd5eb564e65cf622f6e0e73e1c270de957d7c102495a4b92","source":{"kind":"arxiv","id":"1301.0323","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1301.0323","created_at":"2026-05-18T01:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"1301.0323v1","created_at":"2026-05-18T01:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1301.0323","created_at":"2026-05-18T01:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"JIZUZ4FKBENX","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"JIZUZ4FKBENXFXK6","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"JIZUZ4FK","created_at":"2026-05-18T12:27:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:JIZUZ4FKBENXFXK6WVSOMXHWEL","target":"record","payload":{"canonical_record":{"source":{"id":"1301.0323","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-01-02T21:00:02Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"cc725043684c881f46f9c4945a9e78ef73c4054b3c7b4f32a67fb1ea8b95c84b","abstract_canon_sha256":"5a26b20bd8f76b48a3f5038856d52f3daf7166210eb871319de00e7db1acb261"},"schema_version":"1.0"},"canonical_sha256":"4a334cf0aa091b72dd5eb564e65cf622f6e0e73e1c270de957d7c102495a4b92","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:52:22.104054Z","signature_b64":"yqHj8NS3F2bUUlxE7Va3zcUeOlJ7GHop3iaGUjmr9iUbPdzU3Q0a9Ni5as2gyIDgFcLdtoDXpRzUJ76XVRgzCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4a334cf0aa091b72dd5eb564e65cf622f6e0e73e1c270de957d7c102495a4b92","last_reissued_at":"2026-05-18T01:52:22.103555Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:52:22.103555Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1301.0323","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":"2026-05-18T01:52:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B0fqZKKTnaazHBOpMk2fAKRf+GKww4mgmfHad+N5s/w5D2WdCOEsTKpR8xsW3x3mjpFpBMQ5ySR5UlcnapeiBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T08:14:32.256729Z"},"content_sha256":"b3b09f9d638c11ea8a27f99d934a881828a6271e0ecc53c666b1094399a4e158","schema_version":"1.0","event_id":"sha256:b3b09f9d638c11ea8a27f99d934a881828a6271e0ecc53c666b1094399a4e158"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:JIZUZ4FKBENXFXK6WVSOMXHWEL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectroscopy of The Largest Ever Gamma-ray Selected BL Lac Sample","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"Anthony C. S. Readhead, Garret Cotter, Joseph L. Richards, Michael S. Shaw, Oliver G. King, Peter F. Michelson, Roger W. Romani, Stephen E. Healey, Walter Max-Moerbeck, William J. Potter","submitted_at":"2013-01-02T21:00:02Z","abstract_excerpt":"We report on spectroscopic observations covering most of the 475 BL Lacs in the 2nd Fermi LAT catalog of AGN. Including archival measurements (correcting several erroneous literature values) we now have spectroscopic redshifts for 44% of the BL Lacs. We establish firm lower redshift limits via intervening absorption systems and statistical lower limits via searches for host galaxies for an additional 51% of the sample leaving only 5% of the BL Lacs unconstrained. The new redshifts raise the median spectroscopic z from 0.23 to 0.33 and include redshifts as large as z=2.471. Spectroscopic redshi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.0323","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":"2026-05-18T01:52:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5PX7QL88jIWnxEW0DuqMRjsKudBQPkzoJpty4qHAoE3VztDu3MfkcHQgzWEyt+8RuF5z+lfqJQ99UFFErsVnCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T08:14:32.257154Z"},"content_sha256":"9cfc3c26a571a35ab1957a3fcb9f21bc6795215ba233604733098584f042a3b5","schema_version":"1.0","event_id":"sha256:9cfc3c26a571a35ab1957a3fcb9f21bc6795215ba233604733098584f042a3b5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JIZUZ4FKBENXFXK6WVSOMXHWEL/bundle.json","state_url":"https://pith.science/pith/JIZUZ4FKBENXFXK6WVSOMXHWEL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JIZUZ4FKBENXFXK6WVSOMXHWEL/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":"2026-05-22T08:14:32Z","links":{"resolver":"https://pith.science/pith/JIZUZ4FKBENXFXK6WVSOMXHWEL","bundle":"https://pith.science/pith/JIZUZ4FKBENXFXK6WVSOMXHWEL/bundle.json","state":"https://pith.science/pith/JIZUZ4FKBENXFXK6WVSOMXHWEL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JIZUZ4FKBENXFXK6WVSOMXHWEL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:JIZUZ4FKBENXFXK6WVSOMXHWEL","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":"5a26b20bd8f76b48a3f5038856d52f3daf7166210eb871319de00e7db1acb261","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-01-02T21:00:02Z","title_canon_sha256":"cc725043684c881f46f9c4945a9e78ef73c4054b3c7b4f32a67fb1ea8b95c84b"},"schema_version":"1.0","source":{"id":"1301.0323","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1301.0323","created_at":"2026-05-18T01:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"1301.0323v1","created_at":"2026-05-18T01:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1301.0323","created_at":"2026-05-18T01:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"JIZUZ4FKBENX","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_16","alias_value":"JIZUZ4FKBENXFXK6","created_at":"2026-05-18T12:27:49Z"},{"alias_kind":"pith_short_8","alias_value":"JIZUZ4FK","created_at":"2026-05-18T12:27:49Z"}],"graph_snapshots":[{"event_id":"sha256:9cfc3c26a571a35ab1957a3fcb9f21bc6795215ba233604733098584f042a3b5","target":"graph","created_at":"2026-05-18T01:52:22Z","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":"We report on spectroscopic observations covering most of the 475 BL Lacs in the 2nd Fermi LAT catalog of AGN. Including archival measurements (correcting several erroneous literature values) we now have spectroscopic redshifts for 44% of the BL Lacs. We establish firm lower redshift limits via intervening absorption systems and statistical lower limits via searches for host galaxies for an additional 51% of the sample leaving only 5% of the BL Lacs unconstrained. The new redshifts raise the median spectroscopic z from 0.23 to 0.33 and include redshifts as large as z=2.471. Spectroscopic redshi","authors_text":"Anthony C. S. Readhead, Garret Cotter, Joseph L. Richards, Michael S. Shaw, Oliver G. King, Peter F. Michelson, Roger W. Romani, Stephen E. Healey, Walter Max-Moerbeck, William J. Potter","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-01-02T21:00:02Z","title":"Spectroscopy of The Largest Ever Gamma-ray Selected BL Lac Sample"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1301.0323","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:b3b09f9d638c11ea8a27f99d934a881828a6271e0ecc53c666b1094399a4e158","target":"record","created_at":"2026-05-18T01:52:22Z","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":"5a26b20bd8f76b48a3f5038856d52f3daf7166210eb871319de00e7db1acb261","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-01-02T21:00:02Z","title_canon_sha256":"cc725043684c881f46f9c4945a9e78ef73c4054b3c7b4f32a67fb1ea8b95c84b"},"schema_version":"1.0","source":{"id":"1301.0323","kind":"arxiv","version":1}},"canonical_sha256":"4a334cf0aa091b72dd5eb564e65cf622f6e0e73e1c270de957d7c102495a4b92","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4a334cf0aa091b72dd5eb564e65cf622f6e0e73e1c270de957d7c102495a4b92","first_computed_at":"2026-05-18T01:52:22.103555Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:52:22.103555Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yqHj8NS3F2bUUlxE7Va3zcUeOlJ7GHop3iaGUjmr9iUbPdzU3Q0a9Ni5as2gyIDgFcLdtoDXpRzUJ76XVRgzCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:52:22.104054Z","signed_message":"canonical_sha256_bytes"},"source_id":"1301.0323","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b3b09f9d638c11ea8a27f99d934a881828a6271e0ecc53c666b1094399a4e158","sha256:9cfc3c26a571a35ab1957a3fcb9f21bc6795215ba233604733098584f042a3b5"],"state_sha256":"679f251425cdf1f994997f86a1246e15cf14c0cfaab65374cab395d7c0a71fbc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YkyXbAgVJGjmPBm2+SBzX74LYNEQLZDHwzAlv1L5u4N0LBjxEAGhLMYQpsbtF1odBPLv3ZITN5/qDX9aWnG/Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T08:14:32.260095Z","bundle_sha256":"4d7e4cfaf2a6f46b931e480838c4e6cb3e1138a90211120dc1c3912c0676d51c"}}