{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:UCYIROTP2YVGAISBQT6PLHAD74","short_pith_number":"pith:UCYIROTP","canonical_record":{"source":{"id":"1609.05940","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-09-19T21:07:22Z","cross_cats_sorted":[],"title_canon_sha256":"d81b1bf597577bbcd1b4e4d45894f232b53b260694f75be8529e7cbc2858f384","abstract_canon_sha256":"14d91f0a037c99388ded8dd39a879353e524069310010868467ec6f694a73c75"},"schema_version":"1.0"},"canonical_sha256":"a0b088ba6fd62a60224184fcf59c03ff2790f82dfb4241ce7c31acdc7d21abcd","source":{"kind":"arxiv","id":"1609.05940","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.05940","created_at":"2026-05-18T00:43:30Z"},{"alias_kind":"arxiv_version","alias_value":"1609.05940v1","created_at":"2026-05-18T00:43:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.05940","created_at":"2026-05-18T00:43:30Z"},{"alias_kind":"pith_short_12","alias_value":"UCYIROTP2YVG","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"UCYIROTP2YVGAISB","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"UCYIROTP","created_at":"2026-05-18T12:30:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:UCYIROTP2YVGAISBQT6PLHAD74","target":"record","payload":{"canonical_record":{"source":{"id":"1609.05940","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-09-19T21:07:22Z","cross_cats_sorted":[],"title_canon_sha256":"d81b1bf597577bbcd1b4e4d45894f232b53b260694f75be8529e7cbc2858f384","abstract_canon_sha256":"14d91f0a037c99388ded8dd39a879353e524069310010868467ec6f694a73c75"},"schema_version":"1.0"},"canonical_sha256":"a0b088ba6fd62a60224184fcf59c03ff2790f82dfb4241ce7c31acdc7d21abcd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:43:30.412889Z","signature_b64":"TM9ix/jzvkup7lFK1n8O5LCGFwq4Q36FXfH3/QO9GqOpR0IxK4AmJJ1XP7ztZfFnhSKaYF0dkPuSLAthgFWaDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a0b088ba6fd62a60224184fcf59c03ff2790f82dfb4241ce7c31acdc7d21abcd","last_reissued_at":"2026-05-18T00:43:30.412347Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:43:30.412347Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.05940","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:43:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CAWqX9SWFHQcdAkUktGoGAxPwW5wPIdffv0Ea3EUZyby7RBoQxdDr3SopMbZa2Nt6Myxq5ovY6nl30vT8OdxDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T17:40:26.481035Z"},"content_sha256":"53399c72d697233acefa2bba2d6c7adb47154b371ba007eb27fa6a342991603d","schema_version":"1.0","event_id":"sha256:53399c72d697233acefa2bba2d6c7adb47154b371ba007eb27fa6a342991603d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:UCYIROTP2YVGAISBQT6PLHAD74","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Accurate Flux Density Scale from 50 MHz to 50 GHz","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"B.J. Butler, R.A. Perley","submitted_at":"2016-09-19T21:07:22Z","abstract_excerpt":"The flux density scale of Perley and Butler (2013) is extended downwards to ~50 MHz by utilizing recent observations with the Karl G. Jansky Very Large Array (VLA) of 20 sources between 220 MHz and 48.1 GHz, and legacy VLA observations at 73.8 MHz. The derived spectral flux densities are placed on an absolute scale by utilizing the Baars et al. (1977) values of Cygnus A (3C405) for frequencies below 2 GHz, and the Mars-based polynomials for 3C286, 3C295, and 3C196 from Perley and Butler (2013) above 2 GHz. Polynomial expressions are presented for all 20 sources, with accuracy limited by the pr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.05940","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":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:43:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0+rKubbT0VVcVu3lovEFVBreZ5nr4lYwXdxTRSHOnRhX3z05U1yguOkIH/MZuJC8tGbBEpdT82Y348lrYILDCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T17:40:26.481668Z"},"content_sha256":"1768a46e0e3810e620e664513bcea76eaba8d7d2cded81368176d9873eb5b1c8","schema_version":"1.0","event_id":"sha256:1768a46e0e3810e620e664513bcea76eaba8d7d2cded81368176d9873eb5b1c8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UCYIROTP2YVGAISBQT6PLHAD74/bundle.json","state_url":"https://pith.science/pith/UCYIROTP2YVGAISBQT6PLHAD74/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UCYIROTP2YVGAISBQT6PLHAD74/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-20T17:40:26Z","links":{"resolver":"https://pith.science/pith/UCYIROTP2YVGAISBQT6PLHAD74","bundle":"https://pith.science/pith/UCYIROTP2YVGAISBQT6PLHAD74/bundle.json","state":"https://pith.science/pith/UCYIROTP2YVGAISBQT6PLHAD74/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UCYIROTP2YVGAISBQT6PLHAD74/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:UCYIROTP2YVGAISBQT6PLHAD74","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"14d91f0a037c99388ded8dd39a879353e524069310010868467ec6f694a73c75","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-09-19T21:07:22Z","title_canon_sha256":"d81b1bf597577bbcd1b4e4d45894f232b53b260694f75be8529e7cbc2858f384"},"schema_version":"1.0","source":{"id":"1609.05940","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.05940","created_at":"2026-05-18T00:43:30Z"},{"alias_kind":"arxiv_version","alias_value":"1609.05940v1","created_at":"2026-05-18T00:43:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.05940","created_at":"2026-05-18T00:43:30Z"},{"alias_kind":"pith_short_12","alias_value":"UCYIROTP2YVG","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"UCYIROTP2YVGAISB","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"UCYIROTP","created_at":"2026-05-18T12:30:46Z"}],"graph_snapshots":[{"event_id":"sha256:1768a46e0e3810e620e664513bcea76eaba8d7d2cded81368176d9873eb5b1c8","target":"graph","created_at":"2026-05-18T00:43:30Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The flux density scale of Perley and Butler (2013) is extended downwards to ~50 MHz by utilizing recent observations with the Karl G. Jansky Very Large Array (VLA) of 20 sources between 220 MHz and 48.1 GHz, and legacy VLA observations at 73.8 MHz. The derived spectral flux densities are placed on an absolute scale by utilizing the Baars et al. (1977) values of Cygnus A (3C405) for frequencies below 2 GHz, and the Mars-based polynomials for 3C286, 3C295, and 3C196 from Perley and Butler (2013) above 2 GHz. Polynomial expressions are presented for all 20 sources, with accuracy limited by the pr","authors_text":"B.J. Butler, R.A. Perley","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-09-19T21:07:22Z","title":"An Accurate Flux Density Scale from 50 MHz to 50 GHz"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.05940","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:53399c72d697233acefa2bba2d6c7adb47154b371ba007eb27fa6a342991603d","target":"record","created_at":"2026-05-18T00:43:30Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"14d91f0a037c99388ded8dd39a879353e524069310010868467ec6f694a73c75","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-09-19T21:07:22Z","title_canon_sha256":"d81b1bf597577bbcd1b4e4d45894f232b53b260694f75be8529e7cbc2858f384"},"schema_version":"1.0","source":{"id":"1609.05940","kind":"arxiv","version":1}},"canonical_sha256":"a0b088ba6fd62a60224184fcf59c03ff2790f82dfb4241ce7c31acdc7d21abcd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a0b088ba6fd62a60224184fcf59c03ff2790f82dfb4241ce7c31acdc7d21abcd","first_computed_at":"2026-05-18T00:43:30.412347Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:43:30.412347Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TM9ix/jzvkup7lFK1n8O5LCGFwq4Q36FXfH3/QO9GqOpR0IxK4AmJJ1XP7ztZfFnhSKaYF0dkPuSLAthgFWaDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:43:30.412889Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.05940","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:53399c72d697233acefa2bba2d6c7adb47154b371ba007eb27fa6a342991603d","sha256:1768a46e0e3810e620e664513bcea76eaba8d7d2cded81368176d9873eb5b1c8"],"state_sha256":"b7c4fc26b2635ab45a46fd3050e60d1caa2079684671448ac42a5ebb2b1c3c41"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HApXWi8n0KBke09SE3xpKO7VscZy7tHQykQr0ybll75+oWflX40RsX5F+D7E12IK3GeOvUdAZ1ThtdKK10H4Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T17:40:26.484626Z","bundle_sha256":"fb8cf05b8e86f26409404bdabca8828dc9612f5e68ebc881e1b6be3d80d1f5b6"}}