{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:HWXZPSWVWV6QZYAK4OSVIKD2EH","short_pith_number":"pith:HWXZPSWV","canonical_record":{"source":{"id":"0903.1540","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-03-09T12:07:02Z","cross_cats_sorted":[],"title_canon_sha256":"847cc2d3e62529a5e309e1486840ca8ed0a926a24ba2a29ac3a14f562799e41b","abstract_canon_sha256":"cb3d6a5ce2c538a845d9da971c4082e712dc7626c13e82746de1e536de74227c"},"schema_version":"1.0"},"canonical_sha256":"3daf97cad5b57d0ce00ae3a554287a21d52d7ff272d7064bb4212ea954544f78","source":{"kind":"arxiv","id":"0903.1540","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.1540","created_at":"2026-05-18T04:33:39Z"},{"alias_kind":"arxiv_version","alias_value":"0903.1540v1","created_at":"2026-05-18T04:33:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.1540","created_at":"2026-05-18T04:33:39Z"},{"alias_kind":"pith_short_12","alias_value":"HWXZPSWVWV6Q","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HWXZPSWVWV6QZYAK","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HWXZPSWV","created_at":"2026-05-18T12:25:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:HWXZPSWVWV6QZYAK4OSVIKD2EH","target":"record","payload":{"canonical_record":{"source":{"id":"0903.1540","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-03-09T12:07:02Z","cross_cats_sorted":[],"title_canon_sha256":"847cc2d3e62529a5e309e1486840ca8ed0a926a24ba2a29ac3a14f562799e41b","abstract_canon_sha256":"cb3d6a5ce2c538a845d9da971c4082e712dc7626c13e82746de1e536de74227c"},"schema_version":"1.0"},"canonical_sha256":"3daf97cad5b57d0ce00ae3a554287a21d52d7ff272d7064bb4212ea954544f78","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:33:39.999970Z","signature_b64":"Q2pLvZVzXryuhkgMYoo3rhWoL23PFe2PmD1F0cGYCUowZWj+jR+PXc+SNBqJbMGWfuwotjAXdscaR4lXQ/uXAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3daf97cad5b57d0ce00ae3a554287a21d52d7ff272d7064bb4212ea954544f78","last_reissued_at":"2026-05-18T04:33:39.999527Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:33:39.999527Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0903.1540","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":"2026-05-18T04:33:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"c8x69msioJS14YJp3BFSu+vZci6iv5O13ZC1wlxcyL/hgBb5CH89jHrdMyAXb8aTpIX8Sn3EYV3I7znH/eUmAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T22:50:41.262549Z"},"content_sha256":"1d89cf3f0777fd3d6b5e5bae97e0ef24f70b9c1b8168602edfea1698409f2570","schema_version":"1.0","event_id":"sha256:1d89cf3f0777fd3d6b5e5bae97e0ef24f70b9c1b8168602edfea1698409f2570"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:HWXZPSWVWV6QZYAK4OSVIKD2EH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fresnel zone plates for Achromatic Imaging Survey of X-ray sources","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. Nandi, D. Debnath, S. K. Chakrabarti, S. Palit, V. Yadav","submitted_at":"2009-03-09T12:07:02Z","abstract_excerpt":"A telescope with Fresnel Zone Plates has been contemplated to be an excellent imaging mask in X-rays and gamma-rays for quite some time. With a proper choice of zone plate material, spacing and an appropriate readout system it is possible to achieve any theoretical angular resolution. We provide the results of numerical simulations of how a large number of X-ray sources could be imaged at a high resolution. We believe that such an imager would be an excellent tool for a future survey mission for X-ray and gamma-ray sources which we propose."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.1540","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":"2026-05-18T04:33:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fdg8eEUaQ/X7EteA8Zj6vk/1QekJk+Hfzyku1dBb6DGsIAWUXsNAIHXYzP6CGEHtxsupoRsm9VJe9EAnX/IBBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T22:50:41.263240Z"},"content_sha256":"d0ac91906351ec24c7ba05c96110c446a330c7e1ca33922e8f108d1b6f7e843f","schema_version":"1.0","event_id":"sha256:d0ac91906351ec24c7ba05c96110c446a330c7e1ca33922e8f108d1b6f7e843f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HWXZPSWVWV6QZYAK4OSVIKD2EH/bundle.json","state_url":"https://pith.science/pith/HWXZPSWVWV6QZYAK4OSVIKD2EH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HWXZPSWVWV6QZYAK4OSVIKD2EH/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":"2026-06-11T22:50:41Z","links":{"resolver":"https://pith.science/pith/HWXZPSWVWV6QZYAK4OSVIKD2EH","bundle":"https://pith.science/pith/HWXZPSWVWV6QZYAK4OSVIKD2EH/bundle.json","state":"https://pith.science/pith/HWXZPSWVWV6QZYAK4OSVIKD2EH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HWXZPSWVWV6QZYAK4OSVIKD2EH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:HWXZPSWVWV6QZYAK4OSVIKD2EH","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":"cb3d6a5ce2c538a845d9da971c4082e712dc7626c13e82746de1e536de74227c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-03-09T12:07:02Z","title_canon_sha256":"847cc2d3e62529a5e309e1486840ca8ed0a926a24ba2a29ac3a14f562799e41b"},"schema_version":"1.0","source":{"id":"0903.1540","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0903.1540","created_at":"2026-05-18T04:33:39Z"},{"alias_kind":"arxiv_version","alias_value":"0903.1540v1","created_at":"2026-05-18T04:33:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0903.1540","created_at":"2026-05-18T04:33:39Z"},{"alias_kind":"pith_short_12","alias_value":"HWXZPSWVWV6Q","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_16","alias_value":"HWXZPSWVWV6QZYAK","created_at":"2026-05-18T12:25:59Z"},{"alias_kind":"pith_short_8","alias_value":"HWXZPSWV","created_at":"2026-05-18T12:25:59Z"}],"graph_snapshots":[{"event_id":"sha256:d0ac91906351ec24c7ba05c96110c446a330c7e1ca33922e8f108d1b6f7e843f","target":"graph","created_at":"2026-05-18T04:33:39Z","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":"A telescope with Fresnel Zone Plates has been contemplated to be an excellent imaging mask in X-rays and gamma-rays for quite some time. With a proper choice of zone plate material, spacing and an appropriate readout system it is possible to achieve any theoretical angular resolution. We provide the results of numerical simulations of how a large number of X-ray sources could be imaged at a high resolution. We believe that such an imager would be an excellent tool for a future survey mission for X-ray and gamma-ray sources which we propose.","authors_text":"A. Nandi, D. Debnath, S. K. Chakrabarti, S. Palit, V. Yadav","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-03-09T12:07:02Z","title":"Fresnel zone plates for Achromatic Imaging Survey of X-ray sources"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0903.1540","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":"sha256:1d89cf3f0777fd3d6b5e5bae97e0ef24f70b9c1b8168602edfea1698409f2570","target":"record","created_at":"2026-05-18T04:33:39Z","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":"cb3d6a5ce2c538a845d9da971c4082e712dc7626c13e82746de1e536de74227c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-03-09T12:07:02Z","title_canon_sha256":"847cc2d3e62529a5e309e1486840ca8ed0a926a24ba2a29ac3a14f562799e41b"},"schema_version":"1.0","source":{"id":"0903.1540","kind":"arxiv","version":1}},"canonical_sha256":"3daf97cad5b57d0ce00ae3a554287a21d52d7ff272d7064bb4212ea954544f78","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3daf97cad5b57d0ce00ae3a554287a21d52d7ff272d7064bb4212ea954544f78","first_computed_at":"2026-05-18T04:33:39.999527Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:33:39.999527Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Q2pLvZVzXryuhkgMYoo3rhWoL23PFe2PmD1F0cGYCUowZWj+jR+PXc+SNBqJbMGWfuwotjAXdscaR4lXQ/uXAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:33:39.999970Z","signed_message":"canonical_sha256_bytes"},"source_id":"0903.1540","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d89cf3f0777fd3d6b5e5bae97e0ef24f70b9c1b8168602edfea1698409f2570","sha256:d0ac91906351ec24c7ba05c96110c446a330c7e1ca33922e8f108d1b6f7e843f"],"state_sha256":"8f84fb02d564073134c1c470146792669bda637fa2db65f9dfb5253d277fe1ac"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"16mfzK6kG9TmvHLixVfoOe0XPMxVX0Sd+zPs8E8Pip/kqP3GH+c4NuFXJu0pxkOOlTuEzr4g8AVkFOEwM3bGDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T22:50:41.267098Z","bundle_sha256":"a349070e2306cc098adaa4e175baff82d0c34c41d1487bf91dcfca40d7ff9615"}}