{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:JGKQYGJYOU6OYVXEFKOSZ72F3Z","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":"2c91ab3583304d3f949e71f2fe77f99d0d9664226f3803b717d9be6ba67737ee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-06-08T09:25:28Z","title_canon_sha256":"f41d959158d12ca3026dd49f23d40487d89e522c7d422aa0b01e0dfada7b4bb9"},"schema_version":"1.0","source":{"id":"1506.02411","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.02411","created_at":"2026-05-18T01:22:21Z"},{"alias_kind":"arxiv_version","alias_value":"1506.02411v2","created_at":"2026-05-18T01:22:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.02411","created_at":"2026-05-18T01:22:21Z"},{"alias_kind":"pith_short_12","alias_value":"JGKQYGJYOU6O","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_16","alias_value":"JGKQYGJYOU6OYVXE","created_at":"2026-05-18T12:29:27Z"},{"alias_kind":"pith_short_8","alias_value":"JGKQYGJY","created_at":"2026-05-18T12:29:27Z"}],"graph_snapshots":[{"event_id":"sha256:295c30e4bbfc64e925f8d19c7d01b98d17b78bf5ff1fbb48e16087d07cbfd90f","target":"graph","created_at":"2026-05-18T01:22:21Z","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 detect variability of the Fe Ka emission line in the spectrum of X-ray pulsar 4U 1626-67, correlated with changes in its luminosity and in the shape of its pulse profile. Analysis of archival Chandra and RXTE observations revealed the presence of an intrinsically narrow Fe Ka emission line in the spectrum obtained during the source's current high luminosity period. However, the line was not present during an XMM-Newton observation seven years earlier, when the source was ~three times fainter. The line is resolved by the high energy grating of Chandra at the 98% confidence level, and its sma","authors_text":"Filippos Koliopanos, Marat Gilfanov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-06-08T09:25:28Z","title":"Luminosity dependent change of the emission diagram in the X-ray pulsar 4U 1626-67"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.02411","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":"sha256:2156c302205a9b31bec1f7300b367db4384e1318938294894411ea1347088940","target":"record","created_at":"2026-05-18T01:22:21Z","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":"2c91ab3583304d3f949e71f2fe77f99d0d9664226f3803b717d9be6ba67737ee","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-06-08T09:25:28Z","title_canon_sha256":"f41d959158d12ca3026dd49f23d40487d89e522c7d422aa0b01e0dfada7b4bb9"},"schema_version":"1.0","source":{"id":"1506.02411","kind":"arxiv","version":2}},"canonical_sha256":"49950c1938753cec56e42a9d2cff45de7990e0153e954c76466dfdbe4b4e795b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"49950c1938753cec56e42a9d2cff45de7990e0153e954c76466dfdbe4b4e795b","first_computed_at":"2026-05-18T01:22:21.046619Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:21.046619Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mLkFoyjbS2jstesGEMsu+gA7CBY4zIe7PUPDYnFvYLvOJRLImOKlXldwXaaRN4LSoeDHxy/CoimOqNu4ZPjXDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:21.047641Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.02411","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2156c302205a9b31bec1f7300b367db4384e1318938294894411ea1347088940","sha256:295c30e4bbfc64e925f8d19c7d01b98d17b78bf5ff1fbb48e16087d07cbfd90f"],"state_sha256":"6d7d575ab618413824515e512a8bbf904939aefc175d4a3a82ef09d8518fa72c"}