{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:4YOZBHU34FM7VVXTNM5IV6RX4V","short_pith_number":"pith:4YOZBHU3","canonical_record":{"source":{"id":"2607.19585","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-21T21:26:53Z","cross_cats_sorted":[],"title_canon_sha256":"94e58ac4ca3deb22a11a2716fa80b4403f349376096fca158232670bdeabe06b","abstract_canon_sha256":"a5389168528cc7121c7304455d447c5c82663351d9532b7746041fc2bf3f6fe3"},"schema_version":"1.0"},"canonical_sha256":"e61d909e9be159fad6f36b3a8afa37e573e588c04e20d8833b566acfe05444de","source":{"kind":"arxiv","id":"2607.19585","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.19585","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"arxiv_version","alias_value":"2607.19585v1","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.19585","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"pith_short_12","alias_value":"4YOZBHU34FM7","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"pith_short_16","alias_value":"4YOZBHU34FM7VVXT","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"pith_short_8","alias_value":"4YOZBHU3","created_at":"2026-07-23T00:23:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:4YOZBHU34FM7VVXTNM5IV6RX4V","target":"record","payload":{"canonical_record":{"source":{"id":"2607.19585","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-21T21:26:53Z","cross_cats_sorted":[],"title_canon_sha256":"94e58ac4ca3deb22a11a2716fa80b4403f349376096fca158232670bdeabe06b","abstract_canon_sha256":"a5389168528cc7121c7304455d447c5c82663351d9532b7746041fc2bf3f6fe3"},"schema_version":"1.0"},"canonical_sha256":"e61d909e9be159fad6f36b3a8afa37e573e588c04e20d8833b566acfe05444de","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-23T00:23:57.745827Z","signature_b64":"JrmzbUr1zWT3h9wOOgYpiU2FsfWcNHpelAk+P67qpHwTlxLYDlgpSQK0wzoBD0mhWkqlmGnj9Rt+wtYyHoqbAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e61d909e9be159fad6f36b3a8afa37e573e588c04e20d8833b566acfe05444de","last_reissued_at":"2026-07-23T00:23:57.744420Z","signature_status":"signed_v1","first_computed_at":"2026-07-23T00:23:57.744420Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.19585","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":"2026-07-23T00:23:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xcCL+n5riEQpgKp4n36cOP1uZDHuTl0+EC9szsWM6o8pKGGjn6xZjglzuSrt388Q/KdKgx9HxA+cSZJvZEIRBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T03:25:59.782367Z"},"content_sha256":"a2da7721902d1084063491c934a1a96a4d00d5ffac57de67a5553a0309b4f92a","schema_version":"1.0","event_id":"sha256:a2da7721902d1084063491c934a1a96a4d00d5ffac57de67a5553a0309b4f92a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:4YOZBHU34FM7VVXTNM5IV6RX4V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characterising the response of an International LOFAR Station","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"David J. McKenna, Evan F. Keane, Gavin Ramsay, Joe McCauley, Letizia Vincetti, Oisin Creaner, Owen A. Johnson, Peter T. Gallagher, Sai C. Susarla, Tobia D. Carozzi","submitted_at":"2026-07-21T21:26:53Z","abstract_excerpt":"Phased-array radio interferometers with fixed antennas are a highly scalable design which can achieve a large gain. However they are complex systems and challenging to calibrate. Here we examine the response of an International LOFAR Station, the high-band antennas of the Irish LOFAR station. In modelling our measured responses, we account for projection effects, the frequency-dependence of the aperture efficiency and pulsar spectra, as well as sky and instrumental noise contributions. We perform long-track observations of 11 bright pulsars as they move across the sky, apply RFI mitigation and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.19585","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.19585/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-23T00:23:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wNy3rhUPRfyJI46Z3nmbht2AmK88nqScg8AwviIQFPM8XtBbHd1xeTPR41+MNpsCMw/rfK2TA2FqSpeP0jt5Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T03:25:59.782831Z"},"content_sha256":"d2b1423eee0b4e74612436324438342583fd710e440f06e6470446f9bf18eb9d","schema_version":"1.0","event_id":"sha256:d2b1423eee0b4e74612436324438342583fd710e440f06e6470446f9bf18eb9d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4YOZBHU34FM7VVXTNM5IV6RX4V/bundle.json","state_url":"https://pith.science/pith/4YOZBHU34FM7VVXTNM5IV6RX4V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4YOZBHU34FM7VVXTNM5IV6RX4V/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":"2026-08-05T03:25:59Z","links":{"resolver":"https://pith.science/pith/4YOZBHU34FM7VVXTNM5IV6RX4V","bundle":"https://pith.science/pith/4YOZBHU34FM7VVXTNM5IV6RX4V/bundle.json","state":"https://pith.science/pith/4YOZBHU34FM7VVXTNM5IV6RX4V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4YOZBHU34FM7VVXTNM5IV6RX4V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:4YOZBHU34FM7VVXTNM5IV6RX4V","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":"a5389168528cc7121c7304455d447c5c82663351d9532b7746041fc2bf3f6fe3","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-21T21:26:53Z","title_canon_sha256":"94e58ac4ca3deb22a11a2716fa80b4403f349376096fca158232670bdeabe06b"},"schema_version":"1.0","source":{"id":"2607.19585","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.19585","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"arxiv_version","alias_value":"2607.19585v1","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.19585","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"pith_short_12","alias_value":"4YOZBHU34FM7","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"pith_short_16","alias_value":"4YOZBHU34FM7VVXT","created_at":"2026-07-23T00:23:57Z"},{"alias_kind":"pith_short_8","alias_value":"4YOZBHU3","created_at":"2026-07-23T00:23:57Z"}],"graph_snapshots":[{"event_id":"sha256:d2b1423eee0b4e74612436324438342583fd710e440f06e6470446f9bf18eb9d","target":"graph","created_at":"2026-07-23T00:23:57Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2607.19585/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Phased-array radio interferometers with fixed antennas are a highly scalable design which can achieve a large gain. However they are complex systems and challenging to calibrate. Here we examine the response of an International LOFAR Station, the high-band antennas of the Irish LOFAR station. In modelling our measured responses, we account for projection effects, the frequency-dependence of the aperture efficiency and pulsar spectra, as well as sky and instrumental noise contributions. We perform long-track observations of 11 bright pulsars as they move across the sky, apply RFI mitigation and","authors_text":"David J. McKenna, Evan F. Keane, Gavin Ramsay, Joe McCauley, Letizia Vincetti, Oisin Creaner, Owen A. Johnson, Peter T. Gallagher, Sai C. Susarla, Tobia D. Carozzi","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-21T21:26:53Z","title":"Characterising the response of an International LOFAR Station"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.19585","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:a2da7721902d1084063491c934a1a96a4d00d5ffac57de67a5553a0309b4f92a","target":"record","created_at":"2026-07-23T00:23:57Z","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":"a5389168528cc7121c7304455d447c5c82663351d9532b7746041fc2bf3f6fe3","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-21T21:26:53Z","title_canon_sha256":"94e58ac4ca3deb22a11a2716fa80b4403f349376096fca158232670bdeabe06b"},"schema_version":"1.0","source":{"id":"2607.19585","kind":"arxiv","version":1}},"canonical_sha256":"e61d909e9be159fad6f36b3a8afa37e573e588c04e20d8833b566acfe05444de","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e61d909e9be159fad6f36b3a8afa37e573e588c04e20d8833b566acfe05444de","first_computed_at":"2026-07-23T00:23:57.744420Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-23T00:23:57.744420Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JrmzbUr1zWT3h9wOOgYpiU2FsfWcNHpelAk+P67qpHwTlxLYDlgpSQK0wzoBD0mhWkqlmGnj9Rt+wtYyHoqbAA==","signature_status":"signed_v1","signed_at":"2026-07-23T00:23:57.745827Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.19585","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a2da7721902d1084063491c934a1a96a4d00d5ffac57de67a5553a0309b4f92a","sha256:d2b1423eee0b4e74612436324438342583fd710e440f06e6470446f9bf18eb9d"],"state_sha256":"adbd1fdf264fe97baa562b0acc8e7ac4ddcc3388de1adaa0ac406b64dec48424"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AfJDngK9sc4Ctbpx+T6GmCTzhmMobPoCSJH5ZeS/3jH8dHxcjSV586Q3IHoCrccbo2e4RW+mTUpnIL1msHjaBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T03:25:59.785617Z","bundle_sha256":"ddb67cdc5858bad3e77845475f098be62c2bfa8b70a52ca2aa6395a22b0583ca"}}