{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:JXGQMB2L2B7ZWWGAECYXUWLCYU","short_pith_number":"pith:JXGQMB2L","schema_version":"1.0","canonical_sha256":"4dcd06074bd07f9b58c020b17a5962c53d22f95846e96c9bc350713bfa106f57","source":{"kind":"arxiv","id":"1705.07901","version":2},"attestation_state":"computed","paper":{"title":"Discovery of a Luminous Radio Transient 460 pc from the Central Supermassive Black Hole in Cygnus A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Christopher L. Carilli, Daniel A. Perley, Richard A. Perley, Vivek Dhawan","submitted_at":"2017-05-22T18:00:01Z","abstract_excerpt":"We report the appearance of a new radio source at a projected offset of 460 pc from the nucleus of Cygnus A. The flux density of the source (which we designate Cygnus A-2) rose from an upper limit of <0.5 mJy in 1989 to 4 mJy in 2016 (nu=8.5 GHz), but is currently not varying by more than a few percent per year. The radio luminosity of the source is comparable to the most luminous known supernovae, it is compact in VLBA observations down to a scale of 4 pc, and it is coincident with a near-infrared point source seen in pre-existing adaptive optics and HST observations. The most likely interpre"},"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":"1705.07901","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-05-22T18:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"021a74f082b1b0864b21a8fb01f47edff4df61270c017b8b5a8a5d39a8bf1f0b","abstract_canon_sha256":"58519c30578b1e4a69620d0c04e759b73a27053b8f3743cced2644ac42f4fa32"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:43:15.422609Z","signature_b64":"0/vOVwGuZ7OWTiuSfKRo8AEYmHhNfTmNM4DyM82tUeFKHwQIT1AKjvWcegxOKSJZxAkDD+5QLHPfOnIcRcpIAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4dcd06074bd07f9b58c020b17a5962c53d22f95846e96c9bc350713bfa106f57","last_reissued_at":"2026-05-18T00:43:15.422113Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:43:15.422113Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Discovery of a Luminous Radio Transient 460 pc from the Central Supermassive Black Hole in Cygnus A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Christopher L. Carilli, Daniel A. Perley, Richard A. Perley, Vivek Dhawan","submitted_at":"2017-05-22T18:00:01Z","abstract_excerpt":"We report the appearance of a new radio source at a projected offset of 460 pc from the nucleus of Cygnus A. The flux density of the source (which we designate Cygnus A-2) rose from an upper limit of <0.5 mJy in 1989 to 4 mJy in 2016 (nu=8.5 GHz), but is currently not varying by more than a few percent per year. The radio luminosity of the source is comparable to the most luminous known supernovae, it is compact in VLBA observations down to a scale of 4 pc, and it is coincident with a near-infrared point source seen in pre-existing adaptive optics and HST observations. The most likely interpre"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.07901","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"1705.07901","created_at":"2026-05-18T00:43:15.422184+00:00"},{"alias_kind":"arxiv_version","alias_value":"1705.07901v2","created_at":"2026-05-18T00:43:15.422184+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.07901","created_at":"2026-05-18T00:43:15.422184+00:00"},{"alias_kind":"pith_short_12","alias_value":"JXGQMB2L2B7Z","created_at":"2026-05-18T12:31:24.725408+00:00"},{"alias_kind":"pith_short_16","alias_value":"JXGQMB2L2B7ZWWGA","created_at":"2026-05-18T12:31:24.725408+00:00"},{"alias_kind":"pith_short_8","alias_value":"JXGQMB2L","created_at":"2026-05-18T12:31:24.725408+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/JXGQMB2L2B7ZWWGAECYXUWLCYU","json":"https://pith.science/pith/JXGQMB2L2B7ZWWGAECYXUWLCYU.json","graph_json":"https://pith.science/api/pith-number/JXGQMB2L2B7ZWWGAECYXUWLCYU/graph.json","events_json":"https://pith.science/api/pith-number/JXGQMB2L2B7ZWWGAECYXUWLCYU/events.json","paper":"https://pith.science/paper/JXGQMB2L"},"agent_actions":{"view_html":"https://pith.science/pith/JXGQMB2L2B7ZWWGAECYXUWLCYU","download_json":"https://pith.science/pith/JXGQMB2L2B7ZWWGAECYXUWLCYU.json","view_paper":"https://pith.science/paper/JXGQMB2L","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1705.07901&json=true","fetch_graph":"https://pith.science/api/pith-number/JXGQMB2L2B7ZWWGAECYXUWLCYU/graph.json","fetch_events":"https://pith.science/api/pith-number/JXGQMB2L2B7ZWWGAECYXUWLCYU/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JXGQMB2L2B7ZWWGAECYXUWLCYU/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JXGQMB2L2B7ZWWGAECYXUWLCYU/action/storage_attestation","attest_author":"https://pith.science/pith/JXGQMB2L2B7ZWWGAECYXUWLCYU/action/author_attestation","sign_citation":"https://pith.science/pith/JXGQMB2L2B7ZWWGAECYXUWLCYU/action/citation_signature","submit_replication":"https://pith.science/pith/JXGQMB2L2B7ZWWGAECYXUWLCYU/action/replication_record"}},"created_at":"2026-05-18T00:43:15.422184+00:00","updated_at":"2026-05-18T00:43:15.422184+00:00"}