{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:2O3AM33Y6KPYJEEMS5DKUDRTOZ","short_pith_number":"pith:2O3AM33Y","canonical_record":{"source":{"id":"1209.3770","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-09-17T20:00:00Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"70371cf182e1bb2002a19c803daea2bdd0cd41d7853130cdd60c893dd0551972","abstract_canon_sha256":"9690f1f40a61ba4a5925e41fe617f8eac8ec4e667df903bfccfee77e37c0db60"},"schema_version":"1.0"},"canonical_sha256":"d3b6066f78f29f84908c9746aa0e3376600baca121dfa6aa7bf3ae6f39671bef","source":{"kind":"arxiv","id":"1209.3770","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.3770","created_at":"2026-05-18T01:54:27Z"},{"alias_kind":"arxiv_version","alias_value":"1209.3770v1","created_at":"2026-05-18T01:54:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.3770","created_at":"2026-05-18T01:54:27Z"},{"alias_kind":"pith_short_12","alias_value":"2O3AM33Y6KPY","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"2O3AM33Y6KPYJEEM","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"2O3AM33Y","created_at":"2026-05-18T12:26:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:2O3AM33Y6KPYJEEMS5DKUDRTOZ","target":"record","payload":{"canonical_record":{"source":{"id":"1209.3770","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-09-17T20:00:00Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"70371cf182e1bb2002a19c803daea2bdd0cd41d7853130cdd60c893dd0551972","abstract_canon_sha256":"9690f1f40a61ba4a5925e41fe617f8eac8ec4e667df903bfccfee77e37c0db60"},"schema_version":"1.0"},"canonical_sha256":"d3b6066f78f29f84908c9746aa0e3376600baca121dfa6aa7bf3ae6f39671bef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:27.239338Z","signature_b64":"nReEi/5YJHQy8CnUzfBqPMyXmwlauD6K/1f9o55WbjK8NNVNGt9NuuVZHwPpl+ccxOLzwDHR1NGrZC+n4/YbCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d3b6066f78f29f84908c9746aa0e3376600baca121dfa6aa7bf3ae6f39671bef","last_reissued_at":"2026-05-18T01:54:27.238842Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:27.238842Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.3770","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":"2026-05-18T01:54:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BWS7NLY3smzv+wb6kfL8CqG/lggUXjRUo1jw11FynHC9qxT2++n5uGhj1XcEblnlTGQGSzWcgU54Vul7Aab/DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:06:49.867830Z"},"content_sha256":"6fa37a7b6dea154f241027bf389885d187ad18dc4994812072b479aca0a59d45","schema_version":"1.0","event_id":"sha256:6fa37a7b6dea154f241027bf389885d187ad18dc4994812072b479aca0a59d45"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:2O3AM33Y6KPYJEEMS5DKUDRTOZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characterizing the Optical Variability of Bright Blazars: Variability-Based Selection of Fermi AGN","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"Andrew C. Becker, Branimir Sesar, Chelsea L. MacLeod, Christopher S. Kochanek, James R. A. Davenport, John J. Ruan, J. Scott Stuart, Richard M. Plotkin, Scott F. Anderson, T. H. Burnett, Zeljko Ivezic","submitted_at":"2012-09-17T20:00:00Z","abstract_excerpt":"We investigate the use of optical photometric variability to select and identify blazars in large-scale time-domain surveys, in part to aid in the identification of blazar counterparts to the ~30% of gamma-ray sources in the Fermi 2FGL catalog still lacking reliable associations. Using data from the optical LINEAR asteroid survey, we characterize the optical variability of blazars by fitting a damped random walk model to individual light curves with two main model parameters, the characteristic timescales of variability (tau), and driving amplitudes on short timescales (sigma). Imposing cuts o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.3770","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":"2026-05-18T01:54:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XxSLMQr/Infwqxc9uJMFID6ZCl5B76ZPcLcNlIk8CdILEQBt1qZDIIJHYCAX+njgbMvN9jz9H9iO/hYbV6bMAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T21:06:49.868622Z"},"content_sha256":"e519d2c04dbb7e12c6933ee0a36288353f5b7c0eb0f871c20ff7cc53a0047699","schema_version":"1.0","event_id":"sha256:e519d2c04dbb7e12c6933ee0a36288353f5b7c0eb0f871c20ff7cc53a0047699"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2O3AM33Y6KPYJEEMS5DKUDRTOZ/bundle.json","state_url":"https://pith.science/pith/2O3AM33Y6KPYJEEMS5DKUDRTOZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2O3AM33Y6KPYJEEMS5DKUDRTOZ/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":"2026-05-31T21:06:49Z","links":{"resolver":"https://pith.science/pith/2O3AM33Y6KPYJEEMS5DKUDRTOZ","bundle":"https://pith.science/pith/2O3AM33Y6KPYJEEMS5DKUDRTOZ/bundle.json","state":"https://pith.science/pith/2O3AM33Y6KPYJEEMS5DKUDRTOZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2O3AM33Y6KPYJEEMS5DKUDRTOZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:2O3AM33Y6KPYJEEMS5DKUDRTOZ","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":"9690f1f40a61ba4a5925e41fe617f8eac8ec4e667df903bfccfee77e37c0db60","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-09-17T20:00:00Z","title_canon_sha256":"70371cf182e1bb2002a19c803daea2bdd0cd41d7853130cdd60c893dd0551972"},"schema_version":"1.0","source":{"id":"1209.3770","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.3770","created_at":"2026-05-18T01:54:27Z"},{"alias_kind":"arxiv_version","alias_value":"1209.3770v1","created_at":"2026-05-18T01:54:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.3770","created_at":"2026-05-18T01:54:27Z"},{"alias_kind":"pith_short_12","alias_value":"2O3AM33Y6KPY","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"2O3AM33Y6KPYJEEM","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"2O3AM33Y","created_at":"2026-05-18T12:26:50Z"}],"graph_snapshots":[{"event_id":"sha256:e519d2c04dbb7e12c6933ee0a36288353f5b7c0eb0f871c20ff7cc53a0047699","target":"graph","created_at":"2026-05-18T01:54:27Z","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 investigate the use of optical photometric variability to select and identify blazars in large-scale time-domain surveys, in part to aid in the identification of blazar counterparts to the ~30% of gamma-ray sources in the Fermi 2FGL catalog still lacking reliable associations. Using data from the optical LINEAR asteroid survey, we characterize the optical variability of blazars by fitting a damped random walk model to individual light curves with two main model parameters, the characteristic timescales of variability (tau), and driving amplitudes on short timescales (sigma). Imposing cuts o","authors_text":"Andrew C. Becker, Branimir Sesar, Chelsea L. MacLeod, Christopher S. Kochanek, James R. A. Davenport, John J. Ruan, J. Scott Stuart, Richard M. Plotkin, Scott F. Anderson, T. H. Burnett, Zeljko Ivezic","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-09-17T20:00:00Z","title":"Characterizing the Optical Variability of Bright Blazars: Variability-Based Selection of Fermi AGN"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.3770","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":"sha256:6fa37a7b6dea154f241027bf389885d187ad18dc4994812072b479aca0a59d45","target":"record","created_at":"2026-05-18T01:54:27Z","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":"9690f1f40a61ba4a5925e41fe617f8eac8ec4e667df903bfccfee77e37c0db60","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-09-17T20:00:00Z","title_canon_sha256":"70371cf182e1bb2002a19c803daea2bdd0cd41d7853130cdd60c893dd0551972"},"schema_version":"1.0","source":{"id":"1209.3770","kind":"arxiv","version":1}},"canonical_sha256":"d3b6066f78f29f84908c9746aa0e3376600baca121dfa6aa7bf3ae6f39671bef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d3b6066f78f29f84908c9746aa0e3376600baca121dfa6aa7bf3ae6f39671bef","first_computed_at":"2026-05-18T01:54:27.238842Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:27.238842Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nReEi/5YJHQy8CnUzfBqPMyXmwlauD6K/1f9o55WbjK8NNVNGt9NuuVZHwPpl+ccxOLzwDHR1NGrZC+n4/YbCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:27.239338Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.3770","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6fa37a7b6dea154f241027bf389885d187ad18dc4994812072b479aca0a59d45","sha256:e519d2c04dbb7e12c6933ee0a36288353f5b7c0eb0f871c20ff7cc53a0047699"],"state_sha256":"8aa81e829b5d4b227d9ebb224177f1ad59a034bba5e6a6678927ecc855a57d7a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9r5NM7Wy3nOkwWsUEVbW95ZLQJVaSKeN9t2PN70lRy+BL1H7LbuI/rh/zdC/6ZVSiZ6On3pWe0RivbCJ64EgDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T21:06:49.872939Z","bundle_sha256":"f7e469d2b4e6e4f87082d6d231971da155740b0f204a91855cc12f4d97f0ccc8"}}