{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:PSE2SYINGQ36VUGVACLEDAJE3B","short_pith_number":"pith:PSE2SYIN","canonical_record":{"source":{"id":"1509.04770","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-15T23:49:15Z","cross_cats_sorted":[],"title_canon_sha256":"a7dca7b6a1988c51fcc03f81f4fde473ff9ef2afc67c903ff75086af8b05b27f","abstract_canon_sha256":"b83a9583976e4aae3408898fa0449bbd96a96b08c623d6adf343c72cae8d9a1f"},"schema_version":"1.0"},"canonical_sha256":"7c89a9610d3437ead0d50096418124d8566a3807c32026772e3950c005d9e44f","source":{"kind":"arxiv","id":"1509.04770","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.04770","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"arxiv_version","alias_value":"1509.04770v1","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.04770","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"pith_short_12","alias_value":"PSE2SYINGQ36","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PSE2SYINGQ36VUGV","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PSE2SYIN","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:PSE2SYINGQ36VUGVACLEDAJE3B","target":"record","payload":{"canonical_record":{"source":{"id":"1509.04770","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-15T23:49:15Z","cross_cats_sorted":[],"title_canon_sha256":"a7dca7b6a1988c51fcc03f81f4fde473ff9ef2afc67c903ff75086af8b05b27f","abstract_canon_sha256":"b83a9583976e4aae3408898fa0449bbd96a96b08c623d6adf343c72cae8d9a1f"},"schema_version":"1.0"},"canonical_sha256":"7c89a9610d3437ead0d50096418124d8566a3807c32026772e3950c005d9e44f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:32:51.756634Z","signature_b64":"SWI79Xvb61p4RU+yOVPsSP0P/dan7O4kSrWVQy9ONGlcDdC6L9FdKLdQEsfUNzszB6moQarIv1icMi2gOLVIAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7c89a9610d3437ead0d50096418124d8566a3807c32026772e3950c005d9e44f","last_reissued_at":"2026-05-18T01:32:51.755984Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:32:51.755984Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.04770","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":"2026-05-18T01:32:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wm3fWqnwvTvMdXouYtdUSBSSOIQUA1dTQ8tI5U42ThJrlrpryGiabvK9iDFvVWp9hvChycC8mdFYdqmtMJixBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T16:33:22.393806Z"},"content_sha256":"8c7816824e09f7c1c801d89749a9d5a41312c1b1eaa04aa4374fe4ccfca1118b","schema_version":"1.0","event_id":"sha256:8c7816824e09f7c1c801d89749a9d5a41312c1b1eaa04aa4374fe4ccfca1118b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:PSE2SYINGQ36VUGVACLEDAJE3B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An expanded X-ray beam facility (BEaTriX) to test the modular elements of the ATHENA optics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"C. Ferrari, C. Pelliciari, D. Spiga, E. Bonnini, E. Buffagni, G. Pareschi, G. Tagliaferri","submitted_at":"2015-09-15T23:49:15Z","abstract_excerpt":"Future large X-ray observatories like ATHENA will be equipped with very large optics, obtained by assembling modular optical elements, named X-ray Optical Units (XOU) based on the technology of either Silicon Pore Optics or Slumped Glass Optics. In both cases, the final quality of the modular optic (a 5 arcsec HEW requirement for ATHENA) is determined by the accuracy alignment of the XOUs within the assembly, but also by the angular resolution of the individual XOU. This is affected by the mirror shape accuracy, its surface roughness, and the mutual alignment of the mirrors within the XOU itse"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.04770","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":"2026-05-18T01:32:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CK04JaWTJ/JejNHbTIYMMQM9htHA56ZMi9PdEo/GMFE0ZrbSVXwa+U03ctqKN75x8HIHZEbgfThmF6ek0cdqCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T16:33:22.394150Z"},"content_sha256":"9f9f2e5f115c1331bc73906f59c8f0e96a504bac9574ef451efb955b8d42a29e","schema_version":"1.0","event_id":"sha256:9f9f2e5f115c1331bc73906f59c8f0e96a504bac9574ef451efb955b8d42a29e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PSE2SYINGQ36VUGVACLEDAJE3B/bundle.json","state_url":"https://pith.science/pith/PSE2SYINGQ36VUGVACLEDAJE3B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PSE2SYINGQ36VUGVACLEDAJE3B/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":"2026-05-18T16:33:22Z","links":{"resolver":"https://pith.science/pith/PSE2SYINGQ36VUGVACLEDAJE3B","bundle":"https://pith.science/pith/PSE2SYINGQ36VUGVACLEDAJE3B/bundle.json","state":"https://pith.science/pith/PSE2SYINGQ36VUGVACLEDAJE3B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PSE2SYINGQ36VUGVACLEDAJE3B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:PSE2SYINGQ36VUGVACLEDAJE3B","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":"b83a9583976e4aae3408898fa0449bbd96a96b08c623d6adf343c72cae8d9a1f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-15T23:49:15Z","title_canon_sha256":"a7dca7b6a1988c51fcc03f81f4fde473ff9ef2afc67c903ff75086af8b05b27f"},"schema_version":"1.0","source":{"id":"1509.04770","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.04770","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"arxiv_version","alias_value":"1509.04770v1","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.04770","created_at":"2026-05-18T01:32:51Z"},{"alias_kind":"pith_short_12","alias_value":"PSE2SYINGQ36","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"PSE2SYINGQ36VUGV","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"PSE2SYIN","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:9f9f2e5f115c1331bc73906f59c8f0e96a504bac9574ef451efb955b8d42a29e","target":"graph","created_at":"2026-05-18T01:32:51Z","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":"Future large X-ray observatories like ATHENA will be equipped with very large optics, obtained by assembling modular optical elements, named X-ray Optical Units (XOU) based on the technology of either Silicon Pore Optics or Slumped Glass Optics. In both cases, the final quality of the modular optic (a 5 arcsec HEW requirement for ATHENA) is determined by the accuracy alignment of the XOUs within the assembly, but also by the angular resolution of the individual XOU. This is affected by the mirror shape accuracy, its surface roughness, and the mutual alignment of the mirrors within the XOU itse","authors_text":"C. Ferrari, C. Pelliciari, D. Spiga, E. Bonnini, E. Buffagni, G. Pareschi, G. Tagliaferri","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-15T23:49:15Z","title":"An expanded X-ray beam facility (BEaTriX) to test the modular elements of the ATHENA optics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.04770","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":"sha256:8c7816824e09f7c1c801d89749a9d5a41312c1b1eaa04aa4374fe4ccfca1118b","target":"record","created_at":"2026-05-18T01:32:51Z","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":"b83a9583976e4aae3408898fa0449bbd96a96b08c623d6adf343c72cae8d9a1f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-09-15T23:49:15Z","title_canon_sha256":"a7dca7b6a1988c51fcc03f81f4fde473ff9ef2afc67c903ff75086af8b05b27f"},"schema_version":"1.0","source":{"id":"1509.04770","kind":"arxiv","version":1}},"canonical_sha256":"7c89a9610d3437ead0d50096418124d8566a3807c32026772e3950c005d9e44f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7c89a9610d3437ead0d50096418124d8566a3807c32026772e3950c005d9e44f","first_computed_at":"2026-05-18T01:32:51.755984Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:32:51.755984Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SWI79Xvb61p4RU+yOVPsSP0P/dan7O4kSrWVQy9ONGlcDdC6L9FdKLdQEsfUNzszB6moQarIv1icMi2gOLVIAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:32:51.756634Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.04770","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8c7816824e09f7c1c801d89749a9d5a41312c1b1eaa04aa4374fe4ccfca1118b","sha256:9f9f2e5f115c1331bc73906f59c8f0e96a504bac9574ef451efb955b8d42a29e"],"state_sha256":"ba762119c0788e80b6573212466e098bc05949b37655bcb83cb542a13eab23c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zeUi9Kwvps6IgH7Uya9WE6avwxEPATPYGgS3dmJFdLM8oiTWiBUa94oh+uVQM1wBrxJMCG1Xrz+zKPLJWFGIDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-18T16:33:22.395429Z","bundle_sha256":"074e8daa88afe393c29f12371d5d3fb2e329750a619a660f38b38130d7c0a738"}}