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However, only the massive binary Eta Carinae has been firmly associated with a gamma-ray signal. A second system, gamma^2 Velorum, is positionally coincident with a gamma-ray source, but unambiguous identification remains lacking. Aims. Observing orbital modulation of the flux would establish an unambiguous identification of the binary gamma^2 Velorum as the gamma-ray source detected"},"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":"2001.02708","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-01-08T19:24:39Z","cross_cats_sorted":[],"title_canon_sha256":"c12b948c6cb66778bb9e28f26060d02496a709d0c9581e4f47bf9fc1a2daa6cb","abstract_canon_sha256":"b3603309e11f7a81dcddb387e32a8682f1f0b1f29416ac741e4ab713dc2b064b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:50:12.329994Z","signature_b64":"UxAH4lqSRd5k217QB5kDvEoyi+gtu2EKIfgt2agZN0Rs9T89gfu2yu4gAXDgKwhoamhrD+zyl5wMMXN5D/BZAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d16a5a98706ee261156173c3e688b0d0c806a3e18050b05a7b0f4c2944d32c02","last_reissued_at":"2026-07-05T00:50:12.329581Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:50:12.329581Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Hints of gamma-ray orbital variability from gamma^2 Velorum","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"D.F. 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