{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:LQ4X5AA6YYKV3ZBTGEHITWYHT4","short_pith_number":"pith:LQ4X5AA6","canonical_record":{"source":{"id":"1506.04982","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-06-16T14:11:44Z","cross_cats_sorted":[],"title_canon_sha256":"7f36db1bc2be28699a24f900867c225253645e4d37311a75631aebce8a8d1c77","abstract_canon_sha256":"573c51e07923610d2507c9ce9ec00a1f568e7aac4f695e525673e938a2f4c4d8"},"schema_version":"1.0"},"canonical_sha256":"5c397e801ec6155de433310e89db079f05eaa6271d9ba5f862b03d7a0f71cb69","source":{"kind":"arxiv","id":"1506.04982","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.04982","created_at":"2026-05-18T01:35:46Z"},{"alias_kind":"arxiv_version","alias_value":"1506.04982v1","created_at":"2026-05-18T01:35:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.04982","created_at":"2026-05-18T01:35:46Z"},{"alias_kind":"pith_short_12","alias_value":"LQ4X5AA6YYKV","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LQ4X5AA6YYKV3ZBT","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LQ4X5AA6","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:LQ4X5AA6YYKV3ZBTGEHITWYHT4","target":"record","payload":{"canonical_record":{"source":{"id":"1506.04982","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-06-16T14:11:44Z","cross_cats_sorted":[],"title_canon_sha256":"7f36db1bc2be28699a24f900867c225253645e4d37311a75631aebce8a8d1c77","abstract_canon_sha256":"573c51e07923610d2507c9ce9ec00a1f568e7aac4f695e525673e938a2f4c4d8"},"schema_version":"1.0"},"canonical_sha256":"5c397e801ec6155de433310e89db079f05eaa6271d9ba5f862b03d7a0f71cb69","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:35:46.884524Z","signature_b64":"uC6tzW1ne3DHdajzdKZfFtGbT14LQ3BJtw41u9y+tRA3ngx7ocfioy5xw0KGsL9DTFtMEgTBM0TtMa8eD6tZDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5c397e801ec6155de433310e89db079f05eaa6271d9ba5f862b03d7a0f71cb69","last_reissued_at":"2026-05-18T01:35:46.883867Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:35:46.883867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1506.04982","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":"2026-05-18T01:35:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TZo2dU3vYKWACY4GNeO2Ie97zXAxFp+8ID1JbEZkkKIQxONPmbr9mhlStn/LaXdnHHYqgwEf/ArCWFtDFrv8Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T07:06:06.113058Z"},"content_sha256":"c0efb5823c5ab9b6ed0b3a9ffa40a496969e3693b66f312c5d18137f98b31584","schema_version":"1.0","event_id":"sha256:c0efb5823c5ab9b6ed0b3a9ffa40a496969e3693b66f312c5d18137f98b31584"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:LQ4X5AA6YYKV3ZBTGEHITWYHT4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Bayesian analysis of redshifted 21-cm HI signal and foregrounds: Simulations for LOFAR","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Abhik Ghosh, Emma Chapman, L.V.E. Koopmans, Vibor Jelic","submitted_at":"2015-06-16T14:11:44Z","abstract_excerpt":"Observations of the EoR with the 21-cm hyperfine emission of neutral hydrogen (HI) promise to open an entirely new window onto the formation of the first stars, galaxies and accreting black holes. In order to characterize the weak 21-cm signal, we need to develop imaging techniques which can reconstruct the extended emission very precisely. Here, we present an inversion technique for LOFAR baselines at NCP, based on a Bayesian formalism with optimal spatial regularization, which is used to reconstruct the diffuse foreground map directly from the simulated visibility data. We notice the spatial"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.04982","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":"2026-05-18T01:35:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oAonKnVVw1lf0z17lpg5+pFqdVWOh8MsVrNohBZGWgUk1fG4JFq1Dqo6V3MzoqtsRamTwiZR93MY3wsI6f3DBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T07:06:06.113666Z"},"content_sha256":"4bab921b754fb69ba8bdb201ad8abf95f26e9e88edcca442dc764058d643e605","schema_version":"1.0","event_id":"sha256:4bab921b754fb69ba8bdb201ad8abf95f26e9e88edcca442dc764058d643e605"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LQ4X5AA6YYKV3ZBTGEHITWYHT4/bundle.json","state_url":"https://pith.science/pith/LQ4X5AA6YYKV3ZBTGEHITWYHT4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LQ4X5AA6YYKV3ZBTGEHITWYHT4/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":"2026-05-23T07:06:06Z","links":{"resolver":"https://pith.science/pith/LQ4X5AA6YYKV3ZBTGEHITWYHT4","bundle":"https://pith.science/pith/LQ4X5AA6YYKV3ZBTGEHITWYHT4/bundle.json","state":"https://pith.science/pith/LQ4X5AA6YYKV3ZBTGEHITWYHT4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LQ4X5AA6YYKV3ZBTGEHITWYHT4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:LQ4X5AA6YYKV3ZBTGEHITWYHT4","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":"573c51e07923610d2507c9ce9ec00a1f568e7aac4f695e525673e938a2f4c4d8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-06-16T14:11:44Z","title_canon_sha256":"7f36db1bc2be28699a24f900867c225253645e4d37311a75631aebce8a8d1c77"},"schema_version":"1.0","source":{"id":"1506.04982","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.04982","created_at":"2026-05-18T01:35:46Z"},{"alias_kind":"arxiv_version","alias_value":"1506.04982v1","created_at":"2026-05-18T01:35:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.04982","created_at":"2026-05-18T01:35:46Z"},{"alias_kind":"pith_short_12","alias_value":"LQ4X5AA6YYKV","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LQ4X5AA6YYKV3ZBT","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LQ4X5AA6","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:4bab921b754fb69ba8bdb201ad8abf95f26e9e88edcca442dc764058d643e605","target":"graph","created_at":"2026-05-18T01:35:46Z","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":"Observations of the EoR with the 21-cm hyperfine emission of neutral hydrogen (HI) promise to open an entirely new window onto the formation of the first stars, galaxies and accreting black holes. In order to characterize the weak 21-cm signal, we need to develop imaging techniques which can reconstruct the extended emission very precisely. Here, we present an inversion technique for LOFAR baselines at NCP, based on a Bayesian formalism with optimal spatial regularization, which is used to reconstruct the diffuse foreground map directly from the simulated visibility data. We notice the spatial","authors_text":"Abhik Ghosh, Emma Chapman, L.V.E. Koopmans, Vibor Jelic","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-06-16T14:11:44Z","title":"A Bayesian analysis of redshifted 21-cm HI signal and foregrounds: Simulations for LOFAR"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.04982","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:c0efb5823c5ab9b6ed0b3a9ffa40a496969e3693b66f312c5d18137f98b31584","target":"record","created_at":"2026-05-18T01:35:46Z","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":"573c51e07923610d2507c9ce9ec00a1f568e7aac4f695e525673e938a2f4c4d8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2015-06-16T14:11:44Z","title_canon_sha256":"7f36db1bc2be28699a24f900867c225253645e4d37311a75631aebce8a8d1c77"},"schema_version":"1.0","source":{"id":"1506.04982","kind":"arxiv","version":1}},"canonical_sha256":"5c397e801ec6155de433310e89db079f05eaa6271d9ba5f862b03d7a0f71cb69","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5c397e801ec6155de433310e89db079f05eaa6271d9ba5f862b03d7a0f71cb69","first_computed_at":"2026-05-18T01:35:46.883867Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:35:46.883867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"uC6tzW1ne3DHdajzdKZfFtGbT14LQ3BJtw41u9y+tRA3ngx7ocfioy5xw0KGsL9DTFtMEgTBM0TtMa8eD6tZDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:35:46.884524Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.04982","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c0efb5823c5ab9b6ed0b3a9ffa40a496969e3693b66f312c5d18137f98b31584","sha256:4bab921b754fb69ba8bdb201ad8abf95f26e9e88edcca442dc764058d643e605"],"state_sha256":"cc71e5a8594f0ea106ce2dd2c92842db909d16f57d8acb04ed0fa9794d2c1f34"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xhUvKqLoGszZFI8AC08BRPeEezaSHrX08E/r1z73gW2EE7cex+XKxj7F0mvF/2kr0i/NFeewYjvzmkvOnvB9CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T07:06:06.116967Z","bundle_sha256":"8da00178496f8224a5f499387e0222da12cf7c2428f7fd11017cb71a9c86aa37"}}