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Methods: We analyzed all publicly available optical-to-X-ray observations performed by XMM-Newton, Swift, and INTEGRAL. Conclusions: PKS 2149-306 is one of four blazars at z>2 that have been observed in the hard-X-ray regime with both the BAT and ISGRI instruments. Observations acquired almost 1 year apart in the 60-300 keV energy band in the object rest frame, exhibit no noticeable change in spectral slope associated with a flux variation of more t"},"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":"0902.1789","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-02-11T14:24:15Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"86e570751a44a420187f66f781fe4284b1c953b8534672f8a0e04cfac8e9416a","abstract_canon_sha256":"1ba87545d64e98f082b93497ec2aa95ba09a15b76356e94b61da1168a2778dfc"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:14:23.621711Z","signature_b64":"wbN2t07c2fIB9yPKWM+0v59x0xpQJqk5kZz1HuSxzIve1uzigxwGHLT8m0P4KynQV6RPWNNJObYDgSZ3CEgGCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0a851d6c8e0e1d1a7d14623865caff68a881e93faa880409c0df4052a61ae5fb","last_reissued_at":"2026-07-04T17:14:23.621204Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:14:23.621204Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The changing look of PKS 2149-306","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A. Treves, A. Wolter, E. Pian, F. Tavecchio, G. Di Cocco, G. Ghisellini, G. Tagliaferri, L. Foschini, M. Gliozzi, R. M. Sambruna, V. Bianchin","submitted_at":"2009-02-11T14:24:15Z","abstract_excerpt":"Aims: We study the blazar nature of the high-redshift Flat-Spectrum Radio Quasar PKS 2149-306 (z = 2.345) by investigating its long-term behavior. Methods: We analyzed all publicly available optical-to-X-ray observations performed by XMM-Newton, Swift, and INTEGRAL. Conclusions: PKS 2149-306 is one of four blazars at z>2 that have been observed in the hard-X-ray regime with both the BAT and ISGRI instruments. 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