{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:GS5XIUQPLIJGULHNDNMJH4SR4Q","short_pith_number":"pith:GS5XIUQP","schema_version":"1.0","canonical_sha256":"34bb74520f5a126a2ced1b5893f251e439eb9d32bbb547ca03437dc945c74567","source":{"kind":"arxiv","id":"1101.2050","version":2},"attestation_state":"computed","paper":{"title":"The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Minfeng Gu (SHAO, UCSB), Y. L. Ai (NAOC/Yunnan Observatory)","submitted_at":"2011-01-11T06:17:31Z","abstract_excerpt":"Context. Although a bluer-when-brighter trend is commonly observed in blazars, the opposite trend of redder-when-brighter has also been found in some blazars. Aims. We investigate the frequency of the redder-when-brighter trend in flat-spectrum radio quasars (FSRQs). Methods. We investigate the optical variability of 29 FSRQs in the SDSS Stripe 82 region using SDSS DR7 released multi-epoch data covering about nine years. We determined the spectral index by fitting a powerlaw to SDSS ugriz photometric data, and explored the relationship between the spectral index and source brightness. Results."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1101.2050","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-01-11T06:17:31Z","cross_cats_sorted":[],"title_canon_sha256":"597335e1a8ef2387beaa9cc252b99fcf00d0a6a72c692356dca0509b2dd70c4a","abstract_canon_sha256":"95465fd22021ceb4a532d67745fc055422559d83aef5b3f371f3e8b5898292a5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:43.115620Z","signature_b64":"17cLA1e3SmtQfnJNCBMvgITA77kSLgCqNAcqvppjliOhi7nWHAdJxfj0z67z/YUd5T9/uUFgNRHR/bjMjRggAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"34bb74520f5a126a2ced1b5893f251e439eb9d32bbb547ca03437dc945c74567","last_reissued_at":"2026-05-18T02:03:43.115083Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:43.115083Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The optical variability of flat-spectrum radio quasars in the SDSS stripe 82 region","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Minfeng Gu (SHAO, UCSB), Y. L. Ai (NAOC/Yunnan Observatory)","submitted_at":"2011-01-11T06:17:31Z","abstract_excerpt":"Context. Although a bluer-when-brighter trend is commonly observed in blazars, the opposite trend of redder-when-brighter has also been found in some blazars. Aims. We investigate the frequency of the redder-when-brighter trend in flat-spectrum radio quasars (FSRQs). Methods. We investigate the optical variability of 29 FSRQs in the SDSS Stripe 82 region using SDSS DR7 released multi-epoch data covering about nine years. We determined the spectral index by fitting a powerlaw to SDSS ugriz photometric data, and explored the relationship between the spectral index and source brightness. Results."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1101.2050","kind":"arxiv","version":2},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1101.2050","created_at":"2026-05-18T02:03:43.115159+00:00"},{"alias_kind":"arxiv_version","alias_value":"1101.2050v2","created_at":"2026-05-18T02:03:43.115159+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1101.2050","created_at":"2026-05-18T02:03:43.115159+00:00"},{"alias_kind":"pith_short_12","alias_value":"GS5XIUQPLIJG","created_at":"2026-05-18T12:26:30.835961+00:00"},{"alias_kind":"pith_short_16","alias_value":"GS5XIUQPLIJGULHN","created_at":"2026-05-18T12:26:30.835961+00:00"},{"alias_kind":"pith_short_8","alias_value":"GS5XIUQP","created_at":"2026-05-18T12:26:30.835961+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q","json":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q.json","graph_json":"https://pith.science/api/pith-number/GS5XIUQPLIJGULHNDNMJH4SR4Q/graph.json","events_json":"https://pith.science/api/pith-number/GS5XIUQPLIJGULHNDNMJH4SR4Q/events.json","paper":"https://pith.science/paper/GS5XIUQP"},"agent_actions":{"view_html":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q","download_json":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q.json","view_paper":"https://pith.science/paper/GS5XIUQP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1101.2050&json=true","fetch_graph":"https://pith.science/api/pith-number/GS5XIUQPLIJGULHNDNMJH4SR4Q/graph.json","fetch_events":"https://pith.science/api/pith-number/GS5XIUQPLIJGULHNDNMJH4SR4Q/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q/action/timestamp_anchor","attest_storage":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q/action/storage_attestation","attest_author":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q/action/author_attestation","sign_citation":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q/action/citation_signature","submit_replication":"https://pith.science/pith/GS5XIUQPLIJGULHNDNMJH4SR4Q/action/replication_record"}},"created_at":"2026-05-18T02:03:43.115159+00:00","updated_at":"2026-05-18T02:03:43.115159+00:00"}