{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:6IDDWJEPUUNXAOPGBHWNHONC34","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":"2583efb90dd6d8cc965fd0d9c79492d368cbe2499cc95ca5c2bd1dfdf952ef4f","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-07-20T18:00:01Z","title_canon_sha256":"8ccda4fd491912becb280d7c5e61fda585dd0ecc7245b2dbed08a5e4597be4cc"},"schema_version":"1.0","source":{"id":"1707.06651","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.06651","created_at":"2026-05-18T00:35:58Z"},{"alias_kind":"arxiv_version","alias_value":"1707.06651v2","created_at":"2026-05-18T00:35:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.06651","created_at":"2026-05-18T00:35:58Z"},{"alias_kind":"pith_short_12","alias_value":"6IDDWJEPUUNX","created_at":"2026-05-18T12:31:03Z"},{"alias_kind":"pith_short_16","alias_value":"6IDDWJEPUUNXAOPG","created_at":"2026-05-18T12:31:03Z"},{"alias_kind":"pith_short_8","alias_value":"6IDDWJEP","created_at":"2026-05-18T12:31:03Z"}],"graph_snapshots":[{"event_id":"sha256:0373e917969e0583fbf08967db88d475f276b67fe1f984792a2a2d8d78789463","target":"graph","created_at":"2026-05-18T00:35:58Z","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 identify sources with extremely hard X-ray spectra (i.e., with photon indices of Gamma<0.6 in the 13 sq. deg. NuSTAR serendipitous survey, to search for the most highly obscured AGNs detected at >10 keV. Eight extreme NuSTAR sources are identified, and we use the NuSTAR data in combination with lower energy X-ray observations (from Chandra, Swift XRT, and XMM-Newton) to characterize the broad-band (0.5-24 keV) X-ray spectra. We find that all of the extreme sources are highly obscured AGNs, including three robust Compton-thick (CT; N_H > 1.5e24 cm^-2) AGNs at low redshift (z<0.1), and a like","authors_text":"A. Annuar, A. Comastri, A. D. Moro, A. Masini, C. Fuentes, C. Ricci, C. Saez, C.-T. J. Chen, D. J. Walton, D. M. Alexander, D. R. Ballantyne, D. Stern, E. Treister, F. A. Harrison, F. Civano, F. E. Bauer, G. B. Lansbury, I. Lamperti, J. Aird, J. A. Tomsick, J. R. Mullaney, L. Zappacosta, M. Ajello, M. Balokovic, M. Brightman, M. Koss, N. Brandt, P. Gandhi, R. J. Assef, S. Marchesi","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-07-20T18:00:01Z","title":"The NuSTAR Serendipitous Survey: Hunting for The Most Extreme Obscured AGN at >10 keV"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.06651","kind":"arxiv","version":2},"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:c0a735c8bf75212beb3d491c2087f2f3627816e62b8fe2822e041fe7c7509bf1","target":"record","created_at":"2026-05-18T00:35:58Z","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":"2583efb90dd6d8cc965fd0d9c79492d368cbe2499cc95ca5c2bd1dfdf952ef4f","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-07-20T18:00:01Z","title_canon_sha256":"8ccda4fd491912becb280d7c5e61fda585dd0ecc7245b2dbed08a5e4597be4cc"},"schema_version":"1.0","source":{"id":"1707.06651","kind":"arxiv","version":2}},"canonical_sha256":"f2063b248fa51b7039e609ecd3b9a2df0195dcb032ba975dd064e85ff7e365a4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f2063b248fa51b7039e609ecd3b9a2df0195dcb032ba975dd064e85ff7e365a4","first_computed_at":"2026-05-18T00:35:58.268501Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:35:58.268501Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NEvicEKP3cmNVek6tIB2dyV4ZJxurON8xC4OR5zjBleBI2tbR3fcIlTxzbQzJH36ji2mdZilC4y3EPs5lWclAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:35:58.269003Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.06651","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c0a735c8bf75212beb3d491c2087f2f3627816e62b8fe2822e041fe7c7509bf1","sha256:0373e917969e0583fbf08967db88d475f276b67fe1f984792a2a2d8d78789463"],"state_sha256":"5743c03fcae0c1fcda2a8d5207cbdbeafaf4040cf039f3884cc842e49dc271e6"}