{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:ETXKZACORE7LWKVRFKZL2TTBUM","short_pith_number":"pith:ETXKZACO","canonical_record":{"source":{"id":"astro-ph/0304087","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-04-04T00:12:50Z","cross_cats_sorted":[],"title_canon_sha256":"a0387ace6779e59d4c27c512e1a7da96dd26bbd6b385cba51b8602232bee290f","abstract_canon_sha256":"1263a44d827d22a561a5e01cb08b8950a8e1dcf8ea93775ce6f9ccc9955419d6"},"schema_version":"1.0"},"canonical_sha256":"24eeac804e893ebb2ab12ab2bd4e61a3088be038428d76c4483ce2d55e01f584","source":{"kind":"arxiv","id":"astro-ph/0304087","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0304087","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0304087v1","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0304087","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"pith_short_12","alias_value":"ETXKZACORE7L","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"pith_short_16","alias_value":"ETXKZACORE7LWKVR","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"pith_short_8","alias_value":"ETXKZACO","created_at":"2026-07-04T16:36:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:ETXKZACORE7LWKVRFKZL2TTBUM","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0304087","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-04-04T00:12:50Z","cross_cats_sorted":[],"title_canon_sha256":"a0387ace6779e59d4c27c512e1a7da96dd26bbd6b385cba51b8602232bee290f","abstract_canon_sha256":"1263a44d827d22a561a5e01cb08b8950a8e1dcf8ea93775ce6f9ccc9955419d6"},"schema_version":"1.0"},"canonical_sha256":"24eeac804e893ebb2ab12ab2bd4e61a3088be038428d76c4483ce2d55e01f584","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:36:47.750842Z","signature_b64":"u7RMgrgV6u4+c5T125nMwLOs8H4EhiFMWJ5kjFpXG6ddcaswKCng32xCusseeL5wrdFwCnyYMlcJzgCD35WdAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"24eeac804e893ebb2ab12ab2bd4e61a3088be038428d76c4483ce2d55e01f584","last_reissued_at":"2026-07-04T16:36:47.750472Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:36:47.750472Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0304087","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":"2026-07-04T16:36:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fkWIAv+nuaXUZbC39ooP5UYGbdtqR6bqiC4rU6udzIPEL37MrrpRtUMPluNTSvLarJ35fTqWgg2s+lxMVfZgBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T05:39:33.368786Z"},"content_sha256":"007ae37e3444c6be118cb58092dcf134304b440c746ac82821cc223f50e84aa2","schema_version":"1.0","event_id":"sha256:007ae37e3444c6be118cb58092dcf134304b440c746ac82821cc223f50e84aa2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:ETXKZACORE7LWKVRFKZL2TTBUM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multi-frequency polarimetry of the Galactic radio background around 350 MHz: II. A region in Horologium around l = 137, b = 7","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) ASTRON, A. G. de Bruyn (2) ((1) Leiden, M. Haverkorn (1), Netherlands, Netherlands), P. Katgert (1)","submitted_at":"2003-04-04T00:12:50Z","abstract_excerpt":"We study a conspicuous ring-like structure with a radius of about 1.4 degrees which was observed with the Westerbork Synthesis Radio Telescope (WSRT) at 5 frequencies around 350 MHz. This ring is very prominent in Stokes Q and U, and less so in polarized intensity P. No corresponding structure is visible in total intensity Stokes I, which indicates that the ring is created by Faraday rotation and depolarization processes. The polarization angle changes regularly from the center of the ring outwards to a radius of more than 1.7 degrees. Thus, the structure in polarization angle is not ring-like"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0304087","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/astro-ph/0304087/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":"2026-07-04T16:36:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IUiLB4/ZLfVnjJmPx7ewfd6weZSrvtHJML3R7tThLZhM1+Whs48sEdzCoOb25+f299OcjUPpBKb2TzHh+X9pBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T05:39:33.369456Z"},"content_sha256":"121641164c37bd6d54db7828c3d4e0e71c4f54d05af34158d29ced0081a9f901","schema_version":"1.0","event_id":"sha256:121641164c37bd6d54db7828c3d4e0e71c4f54d05af34158d29ced0081a9f901"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ETXKZACORE7LWKVRFKZL2TTBUM/bundle.json","state_url":"https://pith.science/pith/ETXKZACORE7LWKVRFKZL2TTBUM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ETXKZACORE7LWKVRFKZL2TTBUM/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":"2026-08-04T05:39:33Z","links":{"resolver":"https://pith.science/pith/ETXKZACORE7LWKVRFKZL2TTBUM","bundle":"https://pith.science/pith/ETXKZACORE7LWKVRFKZL2TTBUM/bundle.json","state":"https://pith.science/pith/ETXKZACORE7LWKVRFKZL2TTBUM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ETXKZACORE7LWKVRFKZL2TTBUM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:ETXKZACORE7LWKVRFKZL2TTBUM","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":"1263a44d827d22a561a5e01cb08b8950a8e1dcf8ea93775ce6f9ccc9955419d6","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-04-04T00:12:50Z","title_canon_sha256":"a0387ace6779e59d4c27c512e1a7da96dd26bbd6b385cba51b8602232bee290f"},"schema_version":"1.0","source":{"id":"astro-ph/0304087","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0304087","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0304087v1","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0304087","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"pith_short_12","alias_value":"ETXKZACORE7L","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"pith_short_16","alias_value":"ETXKZACORE7LWKVR","created_at":"2026-07-04T16:36:47Z"},{"alias_kind":"pith_short_8","alias_value":"ETXKZACO","created_at":"2026-07-04T16:36:47Z"}],"graph_snapshots":[{"event_id":"sha256:121641164c37bd6d54db7828c3d4e0e71c4f54d05af34158d29ced0081a9f901","target":"graph","created_at":"2026-07-04T16:36:47Z","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/astro-ph/0304087/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We study a conspicuous ring-like structure with a radius of about 1.4 degrees which was observed with the Westerbork Synthesis Radio Telescope (WSRT) at 5 frequencies around 350 MHz. This ring is very prominent in Stokes Q and U, and less so in polarized intensity P. No corresponding structure is visible in total intensity Stokes I, which indicates that the ring is created by Faraday rotation and depolarization processes. The polarization angle changes regularly from the center of the ring outwards to a radius of more than 1.7 degrees. Thus, the structure in polarization angle is not ring-like","authors_text":"(2) ASTRON, A. G. de Bruyn (2) ((1) Leiden, M. Haverkorn (1), Netherlands, Netherlands), P. Katgert (1)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-04-04T00:12:50Z","title":"Multi-frequency polarimetry of the Galactic radio background around 350 MHz: II. A region in Horologium around l = 137, b = 7"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0304087","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":"sha256:007ae37e3444c6be118cb58092dcf134304b440c746ac82821cc223f50e84aa2","target":"record","created_at":"2026-07-04T16:36:47Z","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":"1263a44d827d22a561a5e01cb08b8950a8e1dcf8ea93775ce6f9ccc9955419d6","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-04-04T00:12:50Z","title_canon_sha256":"a0387ace6779e59d4c27c512e1a7da96dd26bbd6b385cba51b8602232bee290f"},"schema_version":"1.0","source":{"id":"astro-ph/0304087","kind":"arxiv","version":1}},"canonical_sha256":"24eeac804e893ebb2ab12ab2bd4e61a3088be038428d76c4483ce2d55e01f584","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"24eeac804e893ebb2ab12ab2bd4e61a3088be038428d76c4483ce2d55e01f584","first_computed_at":"2026-07-04T16:36:47.750472Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:36:47.750472Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"u7RMgrgV6u4+c5T125nMwLOs8H4EhiFMWJ5kjFpXG6ddcaswKCng32xCusseeL5wrdFwCnyYMlcJzgCD35WdAw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:36:47.750842Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0304087","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:007ae37e3444c6be118cb58092dcf134304b440c746ac82821cc223f50e84aa2","sha256:121641164c37bd6d54db7828c3d4e0e71c4f54d05af34158d29ced0081a9f901"],"state_sha256":"609a4492d4afde1311811dccd7522840b271739954599d99a4133fed9d9d1afa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MfUdxSR8uAUuh7IUyg+pSqVrRjMGJK5Hnz5hOSvDS4ufKJsQavVXq46KOE0BDqdV1HPvZvq7huEoIUalYyd6AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T05:39:33.374878Z","bundle_sha256":"0ce31e20fcade2fbe46e7f66066791248a9ebf0f5e9f48659dd85d862442998c"}}