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An energy domain poorly studied in this respect is the hard X-ray range above 20 keV.\n  Methods: The first 9 months of the Swift/BAT all-sky survey are used to study the 14 - 195 keV variability of the 44 brightest AGN. The sources have been selected due to their detection significance of >10 sigma. We tested the variability using a maximum likelihood estimator and by analysing the structure function.\n  Results: Probing different time scales, it appears that the absorbed AGN are more variable than th"},"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":"0709.2230","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-09-14T08:53:23Z","cross_cats_sorted":[],"title_canon_sha256":"c2ae6e1a51638a1e0d9fa77c56c3c4e9fa3fe95f1693647c6ccd8166c007b450","abstract_canon_sha256":"7c6a5a7bd4bb8bd03e40a5c6b175186f60f005da7f29879dec8708c4ade1139b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:16:11.246490Z","signature_b64":"TwFKT1qjY5K6/twbPgUq3wsPg3BXhSeXOqwpQlpUK1y1XeS6ZFxlr5VT7hiwAaSkpy20GHgL5afCDeK3n5W7Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ec30e931ca52c6c1ba4578490d14e446e5b4d4b7fa5f37779f7603a8c8894afb","last_reissued_at":"2026-05-18T02:16:11.245631Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:16:11.245631Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Hard X-ray Variability of AGN","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2, 2), (2) Observatoire Astronomique de l'Universite de Geneve, 3), (3) CSST/UMBC, (4) ASD NASA/GSFC), G. 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