{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:PJC5R7PDBKM7FCBAHKOTQQ5WB7","short_pith_number":"pith:PJC5R7PD","canonical_record":{"source":{"id":"2504.02468","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-04-03T10:39:16Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"0484feb9954e1badc960011b6e4456bc74c44bc581de95ce9a938151b1ec7ab0","abstract_canon_sha256":"406d84fd8d3936ea4d06f04317067dc1d282bf0327320c8e5f828713f0748817"},"schema_version":"1.0"},"canonical_sha256":"7a45d8fde30a99f288203a9d3843b60ff30a6d25895b99d3180bea754c4cdaf4","source":{"kind":"arxiv","id":"2504.02468","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.02468","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"arxiv_version","alias_value":"2504.02468v1","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.02468","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"pith_short_12","alias_value":"PJC5R7PDBKM7","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"pith_short_16","alias_value":"PJC5R7PDBKM7FCBA","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"pith_short_8","alias_value":"PJC5R7PD","created_at":"2026-07-05T11:02:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:PJC5R7PDBKM7FCBAHKOTQQ5WB7","target":"record","payload":{"canonical_record":{"source":{"id":"2504.02468","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-04-03T10:39:16Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"0484feb9954e1badc960011b6e4456bc74c44bc581de95ce9a938151b1ec7ab0","abstract_canon_sha256":"406d84fd8d3936ea4d06f04317067dc1d282bf0327320c8e5f828713f0748817"},"schema_version":"1.0"},"canonical_sha256":"7a45d8fde30a99f288203a9d3843b60ff30a6d25895b99d3180bea754c4cdaf4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:02:22.627952Z","signature_b64":"4/VvImnDNeLGWcgnx/mBUJl154Xy6kQfAQu6vCGWJENFi2XA3epj219PBl36bvZSw2PqDrhBxhFTQK2lZ1jYBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7a45d8fde30a99f288203a9d3843b60ff30a6d25895b99d3180bea754c4cdaf4","last_reissued_at":"2026-07-05T11:02:22.627435Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:02:22.627435Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.02468","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":"2026-07-05T11:02:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S0raRNyvuESKuauvxHP28z3CLfLN926PpyB8ZOMGgi3ex7sQ94qOBMpw1C9ACKQpIAobE1RiC7c/gSIzq1bLAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:57:39.180406Z"},"content_sha256":"fa57cc1442c5cbc48221433a3ab3665b25561c187684a8b0f65e1886db95e4d0","schema_version":"1.0","event_id":"sha256:fa57cc1442c5cbc48221433a3ab3665b25561c187684a8b0f65e1886db95e4d0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:PJC5R7PDBKM7FCBAHKOTQQ5WB7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Enhancing Compton telescope imaging with maximum a posteriori estimation: a modified Richardson-Lucy algorithm for the Compton Spectrometer and Imager","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.IM","authors_text":"Alyson Joens, Anaya Valluvan, Andreas Zoglauer, Carolyn Kierans, Chien-You Huang, Chris Karwin, Dieter Hartmann, Eliza Neights, Field Rogers, Hiroki Yoneda, Hugh Bates, Israel Martinez-Castellanos, Jarred Roberts, John Tomsick, Keigo Okuma, Michela Negro, Saurabh Mittal, Savitri Gallego, Sean N. Pike, Shigeki Matsumoto, Steven E. Boggs, Tadayuki Takahashi, Thomas Siegert, Uwe Oberlack, Yong Sheng, Yu Watanabe","submitted_at":"2025-04-03T10:39:16Z","abstract_excerpt":"We present a modified Richardson-Lucy (RL) algorithm tailored for image reconstruction in MeV gamma-ray observations, focusing on its application to the upcoming Compton Spectrometer and Imager (COSI) mission. Our method addresses key challenges in MeV gamma-ray astronomy by incorporating Bayesian priors for sparseness and smoothness while optimizing background components simultaneously. We introduce a novel sparsity term suitable for Poisson-sampled data in addition to a smoothness prior, allowing for flexible reconstruction of both point sources and extended emission. The performance of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.02468","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/2504.02468/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":"2026-07-05T11:02:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dZjLlqlt762JYD5FhxMM4lFfYRsdLwMWpYf0WK4x4ebMeXOxP3+Urx8OBuyB/4Uz1fPTaLPfik7EM64eQM9vBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:57:39.180886Z"},"content_sha256":"7444a9af960c8484342893508185a75fefa7fea573bb27ed6b8627db486d67ca","schema_version":"1.0","event_id":"sha256:7444a9af960c8484342893508185a75fefa7fea573bb27ed6b8627db486d67ca"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PJC5R7PDBKM7FCBAHKOTQQ5WB7/bundle.json","state_url":"https://pith.science/pith/PJC5R7PDBKM7FCBAHKOTQQ5WB7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PJC5R7PDBKM7FCBAHKOTQQ5WB7/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":"2026-07-05T15:57:39Z","links":{"resolver":"https://pith.science/pith/PJC5R7PDBKM7FCBAHKOTQQ5WB7","bundle":"https://pith.science/pith/PJC5R7PDBKM7FCBAHKOTQQ5WB7/bundle.json","state":"https://pith.science/pith/PJC5R7PDBKM7FCBAHKOTQQ5WB7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PJC5R7PDBKM7FCBAHKOTQQ5WB7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:PJC5R7PDBKM7FCBAHKOTQQ5WB7","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":"406d84fd8d3936ea4d06f04317067dc1d282bf0327320c8e5f828713f0748817","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-04-03T10:39:16Z","title_canon_sha256":"0484feb9954e1badc960011b6e4456bc74c44bc581de95ce9a938151b1ec7ab0"},"schema_version":"1.0","source":{"id":"2504.02468","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.02468","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"arxiv_version","alias_value":"2504.02468v1","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.02468","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"pith_short_12","alias_value":"PJC5R7PDBKM7","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"pith_short_16","alias_value":"PJC5R7PDBKM7FCBA","created_at":"2026-07-05T11:02:22Z"},{"alias_kind":"pith_short_8","alias_value":"PJC5R7PD","created_at":"2026-07-05T11:02:22Z"}],"graph_snapshots":[{"event_id":"sha256:7444a9af960c8484342893508185a75fefa7fea573bb27ed6b8627db486d67ca","target":"graph","created_at":"2026-07-05T11:02:22Z","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/2504.02468/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a modified Richardson-Lucy (RL) algorithm tailored for image reconstruction in MeV gamma-ray observations, focusing on its application to the upcoming Compton Spectrometer and Imager (COSI) mission. Our method addresses key challenges in MeV gamma-ray astronomy by incorporating Bayesian priors for sparseness and smoothness while optimizing background components simultaneously. We introduce a novel sparsity term suitable for Poisson-sampled data in addition to a smoothness prior, allowing for flexible reconstruction of both point sources and extended emission. The performance of the ","authors_text":"Alyson Joens, Anaya Valluvan, Andreas Zoglauer, Carolyn Kierans, Chien-You Huang, Chris Karwin, Dieter Hartmann, Eliza Neights, Field Rogers, Hiroki Yoneda, Hugh Bates, Israel Martinez-Castellanos, Jarred Roberts, John Tomsick, Keigo Okuma, Michela Negro, Saurabh Mittal, Savitri Gallego, Sean N. Pike, Shigeki Matsumoto, Steven E. Boggs, Tadayuki Takahashi, Thomas Siegert, Uwe Oberlack, Yong Sheng, Yu Watanabe","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-04-03T10:39:16Z","title":"Enhancing Compton telescope imaging with maximum a posteriori estimation: a modified Richardson-Lucy algorithm for the Compton Spectrometer and Imager"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.02468","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:fa57cc1442c5cbc48221433a3ab3665b25561c187684a8b0f65e1886db95e4d0","target":"record","created_at":"2026-07-05T11:02:22Z","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":"406d84fd8d3936ea4d06f04317067dc1d282bf0327320c8e5f828713f0748817","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-04-03T10:39:16Z","title_canon_sha256":"0484feb9954e1badc960011b6e4456bc74c44bc581de95ce9a938151b1ec7ab0"},"schema_version":"1.0","source":{"id":"2504.02468","kind":"arxiv","version":1}},"canonical_sha256":"7a45d8fde30a99f288203a9d3843b60ff30a6d25895b99d3180bea754c4cdaf4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7a45d8fde30a99f288203a9d3843b60ff30a6d25895b99d3180bea754c4cdaf4","first_computed_at":"2026-07-05T11:02:22.627435Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:02:22.627435Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4/VvImnDNeLGWcgnx/mBUJl154Xy6kQfAQu6vCGWJENFi2XA3epj219PBl36bvZSw2PqDrhBxhFTQK2lZ1jYBg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:02:22.627952Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.02468","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fa57cc1442c5cbc48221433a3ab3665b25561c187684a8b0f65e1886db95e4d0","sha256:7444a9af960c8484342893508185a75fefa7fea573bb27ed6b8627db486d67ca"],"state_sha256":"8167fa213ac6f16ce6b48e9316952cbddb5cbbf3918387d9e08910379e5f6e74"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ECALay87Gv60N6eAQYAFJDW3XXlHjpb3rxybiv89FmqMNv8X7+2UVAKwTjVlwtquZLnj3Hz1v3bQ6vvIvJj+BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T15:57:39.183380Z","bundle_sha256":"08c1f161c816e824bb7cba312f817c7457c6b232f445f2b727dec0b3783af74b"}}