{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:54IK2GB7ZB6JFIAPRKTQCMKFFA","short_pith_number":"pith:54IK2GB7","canonical_record":{"source":{"id":"1302.4857","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-20T10:04:24Z","cross_cats_sorted":["astro-ph.SR","stat.AP"],"title_canon_sha256":"e3c5e1efe7caab8a4a6484ee193b6a01a2dfff54866321a48fd65bc838b52fe2","abstract_canon_sha256":"46d00e761e5806d7c53812c245b0b792a28512dddee284b023e2ec436a02011d"},"schema_version":"1.0"},"canonical_sha256":"ef10ad183fc87c92a00f8aa7013145282dae0efda4e4771bab46a86107ae503f","source":{"kind":"arxiv","id":"1302.4857","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.4857","created_at":"2026-05-18T01:51:35Z"},{"alias_kind":"arxiv_version","alias_value":"1302.4857v1","created_at":"2026-05-18T01:51:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.4857","created_at":"2026-05-18T01:51:35Z"},{"alias_kind":"pith_short_12","alias_value":"54IK2GB7ZB6J","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"54IK2GB7ZB6JFIAP","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"54IK2GB7","created_at":"2026-05-18T12:27:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:54IK2GB7ZB6JFIAPRKTQCMKFFA","target":"record","payload":{"canonical_record":{"source":{"id":"1302.4857","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-20T10:04:24Z","cross_cats_sorted":["astro-ph.SR","stat.AP"],"title_canon_sha256":"e3c5e1efe7caab8a4a6484ee193b6a01a2dfff54866321a48fd65bc838b52fe2","abstract_canon_sha256":"46d00e761e5806d7c53812c245b0b792a28512dddee284b023e2ec436a02011d"},"schema_version":"1.0"},"canonical_sha256":"ef10ad183fc87c92a00f8aa7013145282dae0efda4e4771bab46a86107ae503f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:35.034629Z","signature_b64":"n1Ey5pT/5HpjQSUQ8jBhKBpAnZAUJCfbJqOv2jD1qjnODo5k+tBLdFwlr8uq5lkAPkacxLIEQSsG11L6I+gmDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef10ad183fc87c92a00f8aa7013145282dae0efda4e4771bab46a86107ae503f","last_reissued_at":"2026-05-18T01:51:35.034035Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:35.034035Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.4857","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":"2026-05-18T01:51:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lOSi4kQo4uMqTULU/uRw/oR8Gh1/zrORpK7BHIfPkW0IuI04/WA/AYX2sP2+/+1GkF8h3039LDe5K3dSnOi7DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T05:25:52.826065Z"},"content_sha256":"76c22946053d1e9a3f03d359bcca47ed21c8e7b233ab6920c847668bf652204d","schema_version":"1.0","event_id":"sha256:76c22946053d1e9a3f03d359bcca47ed21c8e7b233ab6920c847668bf652204d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:54IK2GB7ZB6JFIAPRKTQCMKFFA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Expectation Maximization for Hard X-ray Count Modulation Profiles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR","stat.AP"],"primary_cat":"astro-ph.IM","authors_text":"Anna Maria Massone, Federico Benvenuto, Michele Piana, Richard Schwartz","submitted_at":"2013-02-20T10:04:24Z","abstract_excerpt":"This paper is concerned with the image reconstruction problem when the measured data are solar hard X-ray modulation profiles obtained from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)} instrument. Our goal is to demonstrate that a statistical iterative method classically applied to the image deconvolution problem is very effective when utilized for the analysis of count modulation profiles in solar hard X-ray imaging based on Rotating Modulation Collimators. The algorithm described in this paper solves the maximum likelihood problem iteratively and encoding a positivity c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.4857","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":"2026-05-18T01:51:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u5yqL/WJpMDkUbcA7PEUIpvmHsc5B993rE1XD9Uj6kdV6Tg412m6Y94TIjpmxjOLMcyaRf9iAKMfeTMAzFmvAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T05:25:52.826423Z"},"content_sha256":"6d63f9c26469c7a10a1d655c9aa9cdf8c06d31e20061e2729643c1ddf5cff5c1","schema_version":"1.0","event_id":"sha256:6d63f9c26469c7a10a1d655c9aa9cdf8c06d31e20061e2729643c1ddf5cff5c1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/54IK2GB7ZB6JFIAPRKTQCMKFFA/bundle.json","state_url":"https://pith.science/pith/54IK2GB7ZB6JFIAPRKTQCMKFFA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/54IK2GB7ZB6JFIAPRKTQCMKFFA/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":"2026-06-01T05:25:52Z","links":{"resolver":"https://pith.science/pith/54IK2GB7ZB6JFIAPRKTQCMKFFA","bundle":"https://pith.science/pith/54IK2GB7ZB6JFIAPRKTQCMKFFA/bundle.json","state":"https://pith.science/pith/54IK2GB7ZB6JFIAPRKTQCMKFFA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/54IK2GB7ZB6JFIAPRKTQCMKFFA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:54IK2GB7ZB6JFIAPRKTQCMKFFA","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":"46d00e761e5806d7c53812c245b0b792a28512dddee284b023e2ec436a02011d","cross_cats_sorted":["astro-ph.SR","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-20T10:04:24Z","title_canon_sha256":"e3c5e1efe7caab8a4a6484ee193b6a01a2dfff54866321a48fd65bc838b52fe2"},"schema_version":"1.0","source":{"id":"1302.4857","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.4857","created_at":"2026-05-18T01:51:35Z"},{"alias_kind":"arxiv_version","alias_value":"1302.4857v1","created_at":"2026-05-18T01:51:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.4857","created_at":"2026-05-18T01:51:35Z"},{"alias_kind":"pith_short_12","alias_value":"54IK2GB7ZB6J","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"54IK2GB7ZB6JFIAP","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"54IK2GB7","created_at":"2026-05-18T12:27:34Z"}],"graph_snapshots":[{"event_id":"sha256:6d63f9c26469c7a10a1d655c9aa9cdf8c06d31e20061e2729643c1ddf5cff5c1","target":"graph","created_at":"2026-05-18T01:51:35Z","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":"This paper is concerned with the image reconstruction problem when the measured data are solar hard X-ray modulation profiles obtained from the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)} instrument. Our goal is to demonstrate that a statistical iterative method classically applied to the image deconvolution problem is very effective when utilized for the analysis of count modulation profiles in solar hard X-ray imaging based on Rotating Modulation Collimators. The algorithm described in this paper solves the maximum likelihood problem iteratively and encoding a positivity c","authors_text":"Anna Maria Massone, Federico Benvenuto, Michele Piana, Richard Schwartz","cross_cats":["astro-ph.SR","stat.AP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-20T10:04:24Z","title":"Expectation Maximization for Hard X-ray Count Modulation Profiles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.4857","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":"sha256:76c22946053d1e9a3f03d359bcca47ed21c8e7b233ab6920c847668bf652204d","target":"record","created_at":"2026-05-18T01:51:35Z","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":"46d00e761e5806d7c53812c245b0b792a28512dddee284b023e2ec436a02011d","cross_cats_sorted":["astro-ph.SR","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-02-20T10:04:24Z","title_canon_sha256":"e3c5e1efe7caab8a4a6484ee193b6a01a2dfff54866321a48fd65bc838b52fe2"},"schema_version":"1.0","source":{"id":"1302.4857","kind":"arxiv","version":1}},"canonical_sha256":"ef10ad183fc87c92a00f8aa7013145282dae0efda4e4771bab46a86107ae503f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef10ad183fc87c92a00f8aa7013145282dae0efda4e4771bab46a86107ae503f","first_computed_at":"2026-05-18T01:51:35.034035Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:51:35.034035Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"n1Ey5pT/5HpjQSUQ8jBhKBpAnZAUJCfbJqOv2jD1qjnODo5k+tBLdFwlr8uq5lkAPkacxLIEQSsG11L6I+gmDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:51:35.034629Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.4857","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:76c22946053d1e9a3f03d359bcca47ed21c8e7b233ab6920c847668bf652204d","sha256:6d63f9c26469c7a10a1d655c9aa9cdf8c06d31e20061e2729643c1ddf5cff5c1"],"state_sha256":"abdde2ee0a3f017a5bf1f1f72abc894c5a0f089ea2e9cb16a1c9e1c985134e43"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dWBm7S9RuzO27sro5V072FmU9DpSpk7FWVGYIVF8jPM1ElcQCaWYCB1nkoHtlXZEZlhkGLrlP2to1VjQW2UhCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T05:25:52.828431Z","bundle_sha256":"61a713cef86defb51315ffb4edda340434822f41f260776d53d16a3cdfe98178"}}