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These observations were carried out using the Low Resolution Imaging Spectrograph on the W. M. Keck-I Telescope as part of a program to study galaxy-scale gravitational lenses. From our spectra we found the redshift of the background source in CLASS B0128+437 (z_s=3.1240+-0.0042) and the lensing galaxy redshifts in CLASS B0445+123 (z_l=0.5583+-0.0003) and CLASS B0850+054 (z_l=0.5883+-0.0006). Intriguingly, we also discovered that CLASS B0631+519 may have two lensing galaxie"},"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":"astro-ph/0402116","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-02-04T22:23:04Z","cross_cats_sorted":[],"title_canon_sha256":"18c0256139f63490b2e9779495cb6de46d761760f2aeeec594bffff2e1a4cf27","abstract_canon_sha256":"a89f5a0ffa0e50730c1f07141ec8cd574b013434b510784160521bcc7dfb496a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:42:58.548483Z","signature_b64":"9sCf3oX0dul9tyN2lHLtVn5MN6vmWUQW+IfnjJetTIutRJNjfpgNdv1Xxxx3H5fHmWcqVdVCbbBdwqnxaB1TDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3bf6b578043b74f2db459f2f84453c674cf22af4ba5671a47ab17f324daa8ab6","last_reissued_at":"2026-07-04T16:42:58.548074Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:42:58.548074Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Keck spectroscopy of CLASS gravitational lenses","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2), (2) UC Davis, (3) Caltech, 4), (4) STSCI, (5) KIPAC), A.C.S. 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