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We use archival Chandra, XMM-Newton, and Swift-XRT data for old isolated millisecond pulsars to place conservative limits on the Galactic monopole flux ($F_M$). For a benchmark cross-section of $\\sigma_{\\Delta \\rm B} \\sim 10^{-27}\\ {\\rm cm^2}$, our constraint as a function of monopole mass $m_M$ is given by $F_{\\rm M}(m_M) \\lesssim 6 \\times 10^{-19}~\\mathrm{cm^{-2}s^{-1}sr^{-1}} \\times \\max \\big(4 \\times 10^{-6}, \\"},"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":"2608.07652","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-07T18:00:00Z","cross_cats_sorted":["hep-ph","hep-th"],"title_canon_sha256":"365de7b5d77e895e9bd828f161e563156b7a3581b7fdee5e7a2e4a1afef82783","abstract_canon_sha256":"cf6d47c4f1b98cdbf61d52f7551fa1457d33d5f3427267c13329dd385c357566"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-11T00:15:35.068699Z","signature_b64":"mx58jJ3ym7EOvp3tXqlHYaHxZ6SsJUUB51FbO54TBUievkOQeNy3s1B8oTA5k/GD6jfwjm8/FbvflFmVng9+CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bccb373b1ed9e56cd27f818561b92cf7c6a031cf35786ba49e1a8bc8b4361084","last_reissued_at":"2026-08-11T00:15:35.066609Z","signature_status":"signed_v1","first_computed_at":"2026-08-11T00:15:35.066609Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Constraints on magnetic monopoles from X-ray observations of neutron stars","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["hep-ph","hep-th"],"primary_cat":"astro-ph.HE","authors_text":"Daniele Perri, Edward W. 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For a benchmark cross-section of $\\sigma_{\\Delta \\rm B} \\sim 10^{-27}\\ {\\rm cm^2}$, our constraint as a function of monopole mass $m_M$ is given by $F_{\\rm M}(m_M) \\lesssim 6 \\times 10^{-19}~\\mathrm{cm^{-2}s^{-1}sr^{-1}} \\times \\max \\big(4 \\times 10^{-6}, \\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.07652","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2608.07652/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2608.07652","created_at":"2026-08-11T00:15:35.066938+00:00"},{"alias_kind":"arxiv_version","alias_value":"2608.07652v1","created_at":"2026-08-11T00:15:35.066938+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.07652","created_at":"2026-08-11T00:15:35.066938+00:00"},{"alias_kind":"pith_short_12","alias_value":"XTFTOOY63HSW","created_at":"2026-08-11T00:15:35.066938+00:00"},{"alias_kind":"pith_short_16","alias_value":"XTFTOOY63HSWZUT7","created_at":"2026-08-11T00:15:35.066938+00:00"},{"alias_kind":"pith_short_8","alias_value":"XTFTOOY6","created_at":"2026-08-11T00:15:35.066938+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/XTFTOOY63HSWZUT7QGCWDOJM67","json":"https://pith.science/pith/XTFTOOY63HSWZUT7QGCWDOJM67.json","graph_json":"https://pith.science/api/pith-number/XTFTOOY63HSWZUT7QGCWDOJM67/graph.json","events_json":"https://pith.science/api/pith-number/XTFTOOY63HSWZUT7QGCWDOJM67/events.json","paper":"https://pith.science/paper/XTFTOOY6"},"agent_actions":{"view_html":"https://pith.science/pith/XTFTOOY63HSWZUT7QGCWDOJM67","download_json":"https://pith.science/pith/XTFTOOY63HSWZUT7QGCWDOJM67.json","view_paper":"https://pith.science/paper/XTFTOOY6","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2608.07652&json=true","fetch_graph":"https://pith.science/api/pith-number/XTFTOOY63HSWZUT7QGCWDOJM67/graph.json","fetch_events":"https://pith.science/api/pith-number/XTFTOOY63HSWZUT7QGCWDOJM67/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XTFTOOY63HSWZUT7QGCWDOJM67/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XTFTOOY63HSWZUT7QGCWDOJM67/action/storage_attestation","attest_author":"https://pith.science/pith/XTFTOOY63HSWZUT7QGCWDOJM67/action/author_attestation","sign_citation":"https://pith.science/pith/XTFTOOY63HSWZUT7QGCWDOJM67/action/citation_signature","submit_replication":"https://pith.science/pith/XTFTOOY63HSWZUT7QGCWDOJM67/action/replication_record"}},"created_at":"2026-08-11T00:15:35.066938+00:00","updated_at":"2026-08-11T00:15:35.066938+00:00"}