{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:GH7H2G6L5EFSW3VJMRPTZSRORH","short_pith_number":"pith:GH7H2G6L","canonical_record":{"source":{"id":"1608.06281","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-22T15:23:23Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"e1beddb99c3ea5690946b08656ef1e7284f5ebc8a5b1182e2d259682fd6b0c90","abstract_canon_sha256":"451f1d2f37a42b750f7ded5cf396a6a9883e6db22a1a1075c873b57a3fcf5c0c"},"schema_version":"1.0"},"canonical_sha256":"31fe7d1bcbe90b2b6ea9645f3cca2e89d04b92586cf68b9c5bda113a3441b7df","source":{"kind":"arxiv","id":"1608.06281","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.06281","created_at":"2026-05-18T00:55:20Z"},{"alias_kind":"arxiv_version","alias_value":"1608.06281v1","created_at":"2026-05-18T00:55:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.06281","created_at":"2026-05-18T00:55:20Z"},{"alias_kind":"pith_short_12","alias_value":"GH7H2G6L5EFS","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"GH7H2G6L5EFSW3VJ","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"GH7H2G6L","created_at":"2026-05-18T12:30:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:GH7H2G6L5EFSW3VJMRPTZSRORH","target":"record","payload":{"canonical_record":{"source":{"id":"1608.06281","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-22T15:23:23Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"e1beddb99c3ea5690946b08656ef1e7284f5ebc8a5b1182e2d259682fd6b0c90","abstract_canon_sha256":"451f1d2f37a42b750f7ded5cf396a6a9883e6db22a1a1075c873b57a3fcf5c0c"},"schema_version":"1.0"},"canonical_sha256":"31fe7d1bcbe90b2b6ea9645f3cca2e89d04b92586cf68b9c5bda113a3441b7df","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:55:20.804045Z","signature_b64":"dZgoOudTadM1DoJwvg3P1OF7dSqbVgSeV7XAg7L7FJi5I7Xq7lrZFU0Ynd+fi6uBHi1UrjSPx7BrJmsBbITqBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"31fe7d1bcbe90b2b6ea9645f3cca2e89d04b92586cf68b9c5bda113a3441b7df","last_reissued_at":"2026-05-18T00:55:20.803333Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:55:20.803333Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.06281","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":"2026-05-18T00:55:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VN2Ynhug9qyQU1TFpLxf9fuERpFOgwCApKPPlqCdZzOa8HkmY+XgwHoFqUAYPjLwXUyx0Vz4KBRMqo+oAqlyCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T00:59:07.832469Z"},"content_sha256":"f6e9b314366700e5f1a176b70363dec37e18b04727adc098623d26b6fe7be5af","schema_version":"1.0","event_id":"sha256:f6e9b314366700e5f1a176b70363dec37e18b04727adc098623d26b6fe7be5af"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:GH7H2G6L5EFSW3VJMRPTZSRORH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First Season MWA EoR Power Spectrum Results at Redshift 7","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"A. de Oliveira-Costa, A. E. E. Rogers, A. Ewall-Wice, A. Loeb, A. P. Beardsley, A. R. Neben, A. R. Offringa, A. Roshi, A. R. Whitney, A. Williams, B. E. Corey, B. J. Hazelton, B. McKinley, B. M. Gaensler, B. Pindor, C. J. Lonsdale, C. L. Williams, C. M. Trott, C. Wu, D. A. Mitchell, Daniel C. Jacobs, D. Emrich, D. L. Kaplan, D. Oberoi, E. Kratzenberg, E. Lenc, E. Morgan, F. Briggs, G. Bernardi, H. S. Kim, I. S. Sullivan, J. C. Kasper, J. C. Pober, J. Line, J. N. Hewitt, Joshua S. Dillon, J. Riding, J. S. B. Wyithe, Judd D. Bowman, K. S. Srivani, L. Feng, L. J. Greenhill, M. F. Morales, M. J. Lynch, M. Johnston-Hollitt, M. P. Busch, M. Rahimi, M. Tegmark, M. Waterson, N. Barry, N. Hurley-Walker, Nithyanandan Thyagarajan, N. Udaya Shankar, P. Carroll, P. Procopio, R. B. Wayth, R. Goeke, R. J. Cappallo, R. L. Webster, R. Subrahmanyan, Shiv K. Sethi, S. J. Tingay, S. M. Ord, S. Paul, S. R. McWhirter, T. Prabu","submitted_at":"2016-08-22T15:23:23Z","abstract_excerpt":"The Murchison Widefield Array (MWA) has collected hundreds of hours of Epoch of Reionization (EoR) data and now faces the challenge of overcoming foreground and systematic contamination to reduce the data to a cosmological measurement. We introduce several novel analysis techniques such as cable reflection calibration, hyper-resolution gridding kernels, diffuse foreground model subtraction, and quality control methods. Each change to the analysis pipeline is tested against a two dimensional power spectrum figure of merit to demonstrate improvement. We incorporate the new techniques into a deep"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.06281","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":"2026-05-18T00:55:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r/5/G9tNuO4LueaBZOtiqrM90emDKUODPuRF3HuQsgUI6zyHrzh6OLlSJ+Bp88iy/3RS1ONICLGxLY0McQMNCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T00:59:07.833157Z"},"content_sha256":"d72f387cf7030b066f066581d8d495cc9a0d08f54cf0ef350ac8c773e3ada4bd","schema_version":"1.0","event_id":"sha256:d72f387cf7030b066f066581d8d495cc9a0d08f54cf0ef350ac8c773e3ada4bd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GH7H2G6L5EFSW3VJMRPTZSRORH/bundle.json","state_url":"https://pith.science/pith/GH7H2G6L5EFSW3VJMRPTZSRORH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GH7H2G6L5EFSW3VJMRPTZSRORH/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":"2026-05-27T00:59:07Z","links":{"resolver":"https://pith.science/pith/GH7H2G6L5EFSW3VJMRPTZSRORH","bundle":"https://pith.science/pith/GH7H2G6L5EFSW3VJMRPTZSRORH/bundle.json","state":"https://pith.science/pith/GH7H2G6L5EFSW3VJMRPTZSRORH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GH7H2G6L5EFSW3VJMRPTZSRORH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:GH7H2G6L5EFSW3VJMRPTZSRORH","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":"451f1d2f37a42b750f7ded5cf396a6a9883e6db22a1a1075c873b57a3fcf5c0c","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-22T15:23:23Z","title_canon_sha256":"e1beddb99c3ea5690946b08656ef1e7284f5ebc8a5b1182e2d259682fd6b0c90"},"schema_version":"1.0","source":{"id":"1608.06281","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.06281","created_at":"2026-05-18T00:55:20Z"},{"alias_kind":"arxiv_version","alias_value":"1608.06281v1","created_at":"2026-05-18T00:55:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.06281","created_at":"2026-05-18T00:55:20Z"},{"alias_kind":"pith_short_12","alias_value":"GH7H2G6L5EFS","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_16","alias_value":"GH7H2G6L5EFSW3VJ","created_at":"2026-05-18T12:30:19Z"},{"alias_kind":"pith_short_8","alias_value":"GH7H2G6L","created_at":"2026-05-18T12:30:19Z"}],"graph_snapshots":[{"event_id":"sha256:d72f387cf7030b066f066581d8d495cc9a0d08f54cf0ef350ac8c773e3ada4bd","target":"graph","created_at":"2026-05-18T00:55:20Z","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 Murchison Widefield Array (MWA) has collected hundreds of hours of Epoch of Reionization (EoR) data and now faces the challenge of overcoming foreground and systematic contamination to reduce the data to a cosmological measurement. We introduce several novel analysis techniques such as cable reflection calibration, hyper-resolution gridding kernels, diffuse foreground model subtraction, and quality control methods. Each change to the analysis pipeline is tested against a two dimensional power spectrum figure of merit to demonstrate improvement. We incorporate the new techniques into a deep","authors_text":"A. de Oliveira-Costa, A. E. E. Rogers, A. Ewall-Wice, A. Loeb, A. P. Beardsley, A. R. Neben, A. R. Offringa, A. Roshi, A. R. Whitney, A. Williams, B. E. Corey, B. J. Hazelton, B. McKinley, B. M. Gaensler, B. Pindor, C. J. Lonsdale, C. L. Williams, C. M. Trott, C. Wu, D. A. Mitchell, Daniel C. Jacobs, D. Emrich, D. L. Kaplan, D. Oberoi, E. Kratzenberg, E. Lenc, E. Morgan, F. Briggs, G. Bernardi, H. S. Kim, I. S. Sullivan, J. C. Kasper, J. C. Pober, J. Line, J. N. Hewitt, Joshua S. Dillon, J. Riding, J. S. B. Wyithe, Judd D. Bowman, K. S. Srivani, L. Feng, L. J. Greenhill, M. F. Morales, M. J. Lynch, M. Johnston-Hollitt, M. P. Busch, M. Rahimi, M. Tegmark, M. Waterson, N. Barry, N. Hurley-Walker, Nithyanandan Thyagarajan, N. Udaya Shankar, P. Carroll, P. Procopio, R. B. Wayth, R. Goeke, R. J. Cappallo, R. L. Webster, R. Subrahmanyan, Shiv K. Sethi, S. J. Tingay, S. M. Ord, S. Paul, S. R. McWhirter, T. Prabu","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-22T15:23:23Z","title":"First Season MWA EoR Power Spectrum Results at Redshift 7"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.06281","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:f6e9b314366700e5f1a176b70363dec37e18b04727adc098623d26b6fe7be5af","target":"record","created_at":"2026-05-18T00:55:20Z","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":"451f1d2f37a42b750f7ded5cf396a6a9883e6db22a1a1075c873b57a3fcf5c0c","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-22T15:23:23Z","title_canon_sha256":"e1beddb99c3ea5690946b08656ef1e7284f5ebc8a5b1182e2d259682fd6b0c90"},"schema_version":"1.0","source":{"id":"1608.06281","kind":"arxiv","version":1}},"canonical_sha256":"31fe7d1bcbe90b2b6ea9645f3cca2e89d04b92586cf68b9c5bda113a3441b7df","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"31fe7d1bcbe90b2b6ea9645f3cca2e89d04b92586cf68b9c5bda113a3441b7df","first_computed_at":"2026-05-18T00:55:20.803333Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:55:20.803333Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dZgoOudTadM1DoJwvg3P1OF7dSqbVgSeV7XAg7L7FJi5I7Xq7lrZFU0Ynd+fi6uBHi1UrjSPx7BrJmsBbITqBA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:55:20.804045Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.06281","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f6e9b314366700e5f1a176b70363dec37e18b04727adc098623d26b6fe7be5af","sha256:d72f387cf7030b066f066581d8d495cc9a0d08f54cf0ef350ac8c773e3ada4bd"],"state_sha256":"9288b6dd76ec58a9bb6257e7582a90b981d39eb75b865da4c1d6e7a0800b08e6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EgDXvJjyRXxIu35eL8cPRl6qcg0WsnhJpkXa2K0lbSacYR6GptiYuepm+4MuXaAe4rNDFIRNXWQcAk9LE5VwDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T00:59:07.837146Z","bundle_sha256":"1650f122565581c832f5275beec97672db3055cd8c57223c3b8ed7be8fd83f4d"}}