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Wevers","submitted_at":"2016-05-09T20:00:06Z","abstract_excerpt":"As part of the Chandra Galactic Bulge Survey (GBS), we present a catalogue of optical sources in the GBS footprint. This consists of two regions centered at Galactic latitude b = 1.5 degrees above and below the Galactic Centre, spanning (l x b) = (6x1) degrees. The catalogue consists of 2 or more epochs of observations for each line of sight in r', i' and H{\\alpha} filters. It is complete down to r' = 20.2 and i' = 19.2 mag; the mean 5{\\sigma} depth is r' = 22.5 and i' = 21.1 mag. The mean root-mean-square residuals of the astrometric solutions is 0.04 arcsec. We cross-correlate this optical c"},"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":"1605.02741","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-05-09T20:00:06Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"938c37e4a66e88aab3676d9a2b018896e5aafaaeddbd403b7e8624a341884567","abstract_canon_sha256":"5ecc7cae377a44f87b31d4fa738027f6ee5438428e25f8eaa3f3e02de945429d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:15:06.065375Z","signature_b64":"FcLXUzSM+YaZ9ybX/okg3T3XagylAvv6FvICOJavABvHv72wYibBfDUJ0Bm3ZebpyoJUZvhXz+vmiKw4ydpKBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a2e8377746665d40fae9650dfecbefead03fa9fec1a795f083148f6624d2bd6a","last_reissued_at":"2026-05-18T01:15:06.064940Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:15:06.064940Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Chandra Galactic Bulge Survey: optical catalogue and point-source counterparts to X-ray sources","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"C. 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