{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:XB3QXKCZ3KE7UTP4DS5NGVCGZE","short_pith_number":"pith:XB3QXKCZ","canonical_record":{"source":{"id":"1912.08684","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-12-18T15:58:19Z","cross_cats_sorted":[],"title_canon_sha256":"a22ec7b1c95bdcfffb4488bf04904286a603daa169c399a1813387fef36db933","abstract_canon_sha256":"82c8bcc394b2a9e667e9d02d3700960d5e3bc862b022dc12633385bcae569f39"},"schema_version":"1.0"},"canonical_sha256":"b8770ba859da89fa4dfc1cbad35446c9085ca6d10982633ea08ee286f51e17e2","source":{"kind":"arxiv","id":"1912.08684","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.08684","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"arxiv_version","alias_value":"1912.08684v1","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.08684","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"pith_short_12","alias_value":"XB3QXKCZ3KE7","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"pith_short_16","alias_value":"XB3QXKCZ3KE7UTP4","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"pith_short_8","alias_value":"XB3QXKCZ","created_at":"2026-07-05T00:40:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:XB3QXKCZ3KE7UTP4DS5NGVCGZE","target":"record","payload":{"canonical_record":{"source":{"id":"1912.08684","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-12-18T15:58:19Z","cross_cats_sorted":[],"title_canon_sha256":"a22ec7b1c95bdcfffb4488bf04904286a603daa169c399a1813387fef36db933","abstract_canon_sha256":"82c8bcc394b2a9e667e9d02d3700960d5e3bc862b022dc12633385bcae569f39"},"schema_version":"1.0"},"canonical_sha256":"b8770ba859da89fa4dfc1cbad35446c9085ca6d10982633ea08ee286f51e17e2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:40:07.041731Z","signature_b64":"anIRdi6wQqxu2qSgYnu3ujc5vJAOZ6/1rdjCzBxx4dSrd5LtX9xQjxGy6UjbFlLhRzH4Bf5emCnZubdQiYkJCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b8770ba859da89fa4dfc1cbad35446c9085ca6d10982633ea08ee286f51e17e2","last_reissued_at":"2026-07-05T00:40:07.041313Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:40:07.041313Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1912.08684","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":"2026-07-05T00:40:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mgoCEUZ95xKUW8rl6sVccu4QPFTt44dYKFS9MerCnxoGgWmeGk+4SxK61h4eAhzqyNcbH9b6WphIbst7day9Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T17:06:22.427736Z"},"content_sha256":"6dec0d01a769e03094ae15c734914bb2d68e7a220f6a9ff9102f6ac39662a109","schema_version":"1.0","event_id":"sha256:6dec0d01a769e03094ae15c734914bb2d68e7a220f6a9ff9102f6ac39662a109"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:XB3QXKCZ3KE7UTP4DS5NGVCGZE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tips and Tricks in linear imaging polarimetry of extended sources with FORS2 at the VLT","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. B. Higgins, A. Cikota, A. M. Mour\\~ao, F. Patat, J. P. Anderson, K. Silva, K. Wiersema, S. Gonz\\'alez-Gait\\'an","submitted_at":"2019-12-18T15:58:19Z","abstract_excerpt":"Context: Polarimetry is a very powerful tool to uncover various properties of astronomical objects that remain otherwise hidden in standard imaging or spectroscopic observations. However, the reliable measurement of the low polarization signal from astronomical sources requires a good control of spurious instrumental polarization induced by the various components of the optical system and the detector. Aims: We perform a detailed multi-wavelength calibration study of the FORS2 instrument at the VLT operating in imaging polarimetric mode (IPOL) to characterize the spatial instrumental polarizat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.08684","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/1912.08684/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":"2026-07-05T00:40:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MMK+9gZzvfEZ39Bb+FZVmWESI0XflnbATgwmVfwvuxvz4oXuinaWT+hKp5ZBBjOmeL1Xp/TkKXKa5FWkGAQADw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T17:06:22.428716Z"},"content_sha256":"458e3669062bee7af4fffe36756f5d4c181d018bad13ed233ddf9b02c07e0725","schema_version":"1.0","event_id":"sha256:458e3669062bee7af4fffe36756f5d4c181d018bad13ed233ddf9b02c07e0725"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XB3QXKCZ3KE7UTP4DS5NGVCGZE/bundle.json","state_url":"https://pith.science/pith/XB3QXKCZ3KE7UTP4DS5NGVCGZE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XB3QXKCZ3KE7UTP4DS5NGVCGZE/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":"2026-08-11T17:06:22Z","links":{"resolver":"https://pith.science/pith/XB3QXKCZ3KE7UTP4DS5NGVCGZE","bundle":"https://pith.science/pith/XB3QXKCZ3KE7UTP4DS5NGVCGZE/bundle.json","state":"https://pith.science/pith/XB3QXKCZ3KE7UTP4DS5NGVCGZE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XB3QXKCZ3KE7UTP4DS5NGVCGZE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XB3QXKCZ3KE7UTP4DS5NGVCGZE","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":"82c8bcc394b2a9e667e9d02d3700960d5e3bc862b022dc12633385bcae569f39","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-12-18T15:58:19Z","title_canon_sha256":"a22ec7b1c95bdcfffb4488bf04904286a603daa169c399a1813387fef36db933"},"schema_version":"1.0","source":{"id":"1912.08684","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.08684","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"arxiv_version","alias_value":"1912.08684v1","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.08684","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"pith_short_12","alias_value":"XB3QXKCZ3KE7","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"pith_short_16","alias_value":"XB3QXKCZ3KE7UTP4","created_at":"2026-07-05T00:40:07Z"},{"alias_kind":"pith_short_8","alias_value":"XB3QXKCZ","created_at":"2026-07-05T00:40:07Z"}],"graph_snapshots":[{"event_id":"sha256:458e3669062bee7af4fffe36756f5d4c181d018bad13ed233ddf9b02c07e0725","target":"graph","created_at":"2026-07-05T00:40:07Z","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/1912.08684/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Context: Polarimetry is a very powerful tool to uncover various properties of astronomical objects that remain otherwise hidden in standard imaging or spectroscopic observations. However, the reliable measurement of the low polarization signal from astronomical sources requires a good control of spurious instrumental polarization induced by the various components of the optical system and the detector. Aims: We perform a detailed multi-wavelength calibration study of the FORS2 instrument at the VLT operating in imaging polarimetric mode (IPOL) to characterize the spatial instrumental polarizat","authors_text":"A. B. Higgins, A. Cikota, A. M. Mour\\~ao, F. Patat, J. P. Anderson, K. Silva, K. Wiersema, S. Gonz\\'alez-Gait\\'an","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-12-18T15:58:19Z","title":"Tips and Tricks in linear imaging polarimetry of extended sources with FORS2 at the VLT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.08684","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":"sha256:6dec0d01a769e03094ae15c734914bb2d68e7a220f6a9ff9102f6ac39662a109","target":"record","created_at":"2026-07-05T00:40:07Z","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":"82c8bcc394b2a9e667e9d02d3700960d5e3bc862b022dc12633385bcae569f39","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-12-18T15:58:19Z","title_canon_sha256":"a22ec7b1c95bdcfffb4488bf04904286a603daa169c399a1813387fef36db933"},"schema_version":"1.0","source":{"id":"1912.08684","kind":"arxiv","version":1}},"canonical_sha256":"b8770ba859da89fa4dfc1cbad35446c9085ca6d10982633ea08ee286f51e17e2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b8770ba859da89fa4dfc1cbad35446c9085ca6d10982633ea08ee286f51e17e2","first_computed_at":"2026-07-05T00:40:07.041313Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:40:07.041313Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"anIRdi6wQqxu2qSgYnu3ujc5vJAOZ6/1rdjCzBxx4dSrd5LtX9xQjxGy6UjbFlLhRzH4Bf5emCnZubdQiYkJCg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:40:07.041731Z","signed_message":"canonical_sha256_bytes"},"source_id":"1912.08684","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6dec0d01a769e03094ae15c734914bb2d68e7a220f6a9ff9102f6ac39662a109","sha256:458e3669062bee7af4fffe36756f5d4c181d018bad13ed233ddf9b02c07e0725"],"state_sha256":"e4f4fb60c631d5441e59b97441a7d36f7345c7819761939841df0ac24cfdd59c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kTg+GEZb0ITOvtqNRgm5HT4rLnmMdJTb3UATk6Ub3eUXImY3/LxUZe/Q1lTjri624WCafjupahtAQspjY5vfDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T17:06:22.435237Z","bundle_sha256":"3d364f6e14c7ba76abffdb8f6353aa2a153a96a306f48df508581cc25132c2f1"}}