{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:GRB5JTKAJSZHQE5Y4TDBMCAZMV","short_pith_number":"pith:GRB5JTKA","canonical_record":{"source":{"id":"2002.10440","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2020-02-24T18:40:58Z","cross_cats_sorted":["astro-ph.IM","physics.app-ph"],"title_canon_sha256":"0187a351853db8a2fcfd8a23c911b3f8b6b00fae6caa0b962d0fd6e104d9c12f","abstract_canon_sha256":"cf60260623a5e32b4eacf013f74e81d6fc0b1280d0b52400d21e0f431de16178"},"schema_version":"1.0"},"canonical_sha256":"3443d4cd404cb27813b8e4c61608196545c7a6200ff83961c1c1907769fa5965","source":{"kind":"arxiv","id":"2002.10440","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.10440","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"arxiv_version","alias_value":"2002.10440v1","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.10440","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_12","alias_value":"GRB5JTKAJSZH","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_16","alias_value":"GRB5JTKAJSZHQE5Y","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_8","alias_value":"GRB5JTKA","created_at":"2026-07-05T01:12:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:GRB5JTKAJSZHQE5Y4TDBMCAZMV","target":"record","payload":{"canonical_record":{"source":{"id":"2002.10440","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2020-02-24T18:40:58Z","cross_cats_sorted":["astro-ph.IM","physics.app-ph"],"title_canon_sha256":"0187a351853db8a2fcfd8a23c911b3f8b6b00fae6caa0b962d0fd6e104d9c12f","abstract_canon_sha256":"cf60260623a5e32b4eacf013f74e81d6fc0b1280d0b52400d21e0f431de16178"},"schema_version":"1.0"},"canonical_sha256":"3443d4cd404cb27813b8e4c61608196545c7a6200ff83961c1c1907769fa5965","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:12:38.837980Z","signature_b64":"Tezf/OAupabf+lDheDGbVGJyupeYAsX5AHJbwgtPR+wlWCd0LDdwR8Z26V8attdfEemkJXP/qM0P5srN1mACBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3443d4cd404cb27813b8e4c61608196545c7a6200ff83961c1c1907769fa5965","last_reissued_at":"2026-07-05T01:12:38.837334Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:12:38.837334Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2002.10440","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":"2026-07-05T01:12:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FXI+VhMjf/FPy6B2t+wt4F2eOBMmE/mZHIP9bnT49CL+8V78T3KBeaTBaKgijEkjCMFLmQeOOtKBwfZlV9HmBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T18:51:13.086120Z"},"content_sha256":"7049c410acb66b90349686bd0197803bb8bee14e79ffcdeb434d3aa072920fa5","schema_version":"1.0","event_id":"sha256:7049c410acb66b90349686bd0197803bb8bee14e79ffcdeb434d3aa072920fa5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:GRB5JTKAJSZHQE5Y4TDBMCAZMV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Modeling Aerial Gamma-Ray Backgrounds using Non-negative Matrix Factorization","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","physics.app-ph"],"primary_cat":"physics.data-an","authors_text":"A. Zoglauer, B. J. Quiter, K. J. Bilton, M. S. Bandstra, T. H. Y. Joshi","submitted_at":"2020-02-24T18:40:58Z","abstract_excerpt":"Airborne gamma-ray surveys are useful for many applications, ranging from geology and mining to public health and nuclear security. In all these contexts, the ability to decompose a measured spectrum into a linear combination of background source terms can provide useful insights into the data and lead to improvements over techniques that use spectral energy windows. Multiple methods for the linear decomposition of spectra exist but are subject to various drawbacks, such as allowing negative photon fluxes or requiring detailed Monte Carlo modeling. We propose using Non-negative Matrix Factoriz"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.10440","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/2002.10440/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":"2026-07-05T01:12:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jv4jbbdcVtd0tMnFjm2uugIzithjdukEb56Pgc1dlhSSp/jO/1OHDMii3a2d9NQI1B7LxSzdcSrf9FI7KnSVCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T18:51:13.086541Z"},"content_sha256":"005125d7c3533d56f8c4e71c8f4aed4485ee37c9aa2500c7bc97c10c41f18ed4","schema_version":"1.0","event_id":"sha256:005125d7c3533d56f8c4e71c8f4aed4485ee37c9aa2500c7bc97c10c41f18ed4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GRB5JTKAJSZHQE5Y4TDBMCAZMV/bundle.json","state_url":"https://pith.science/pith/GRB5JTKAJSZHQE5Y4TDBMCAZMV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GRB5JTKAJSZHQE5Y4TDBMCAZMV/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":"2026-08-03T18:51:13Z","links":{"resolver":"https://pith.science/pith/GRB5JTKAJSZHQE5Y4TDBMCAZMV","bundle":"https://pith.science/pith/GRB5JTKAJSZHQE5Y4TDBMCAZMV/bundle.json","state":"https://pith.science/pith/GRB5JTKAJSZHQE5Y4TDBMCAZMV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GRB5JTKAJSZHQE5Y4TDBMCAZMV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:GRB5JTKAJSZHQE5Y4TDBMCAZMV","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":"cf60260623a5e32b4eacf013f74e81d6fc0b1280d0b52400d21e0f431de16178","cross_cats_sorted":["astro-ph.IM","physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2020-02-24T18:40:58Z","title_canon_sha256":"0187a351853db8a2fcfd8a23c911b3f8b6b00fae6caa0b962d0fd6e104d9c12f"},"schema_version":"1.0","source":{"id":"2002.10440","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.10440","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"arxiv_version","alias_value":"2002.10440v1","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.10440","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_12","alias_value":"GRB5JTKAJSZH","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_16","alias_value":"GRB5JTKAJSZHQE5Y","created_at":"2026-07-05T01:12:38Z"},{"alias_kind":"pith_short_8","alias_value":"GRB5JTKA","created_at":"2026-07-05T01:12:38Z"}],"graph_snapshots":[{"event_id":"sha256:005125d7c3533d56f8c4e71c8f4aed4485ee37c9aa2500c7bc97c10c41f18ed4","target":"graph","created_at":"2026-07-05T01:12:38Z","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/2002.10440/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Airborne gamma-ray surveys are useful for many applications, ranging from geology and mining to public health and nuclear security. In all these contexts, the ability to decompose a measured spectrum into a linear combination of background source terms can provide useful insights into the data and lead to improvements over techniques that use spectral energy windows. Multiple methods for the linear decomposition of spectra exist but are subject to various drawbacks, such as allowing negative photon fluxes or requiring detailed Monte Carlo modeling. We propose using Non-negative Matrix Factoriz","authors_text":"A. Zoglauer, B. J. Quiter, K. J. Bilton, M. S. Bandstra, T. H. Y. Joshi","cross_cats":["astro-ph.IM","physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2020-02-24T18:40:58Z","title":"Modeling Aerial Gamma-Ray Backgrounds using Non-negative Matrix Factorization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.10440","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":"sha256:7049c410acb66b90349686bd0197803bb8bee14e79ffcdeb434d3aa072920fa5","target":"record","created_at":"2026-07-05T01:12:38Z","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":"cf60260623a5e32b4eacf013f74e81d6fc0b1280d0b52400d21e0f431de16178","cross_cats_sorted":["astro-ph.IM","physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.data-an","submitted_at":"2020-02-24T18:40:58Z","title_canon_sha256":"0187a351853db8a2fcfd8a23c911b3f8b6b00fae6caa0b962d0fd6e104d9c12f"},"schema_version":"1.0","source":{"id":"2002.10440","kind":"arxiv","version":1}},"canonical_sha256":"3443d4cd404cb27813b8e4c61608196545c7a6200ff83961c1c1907769fa5965","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3443d4cd404cb27813b8e4c61608196545c7a6200ff83961c1c1907769fa5965","first_computed_at":"2026-07-05T01:12:38.837334Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:12:38.837334Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Tezf/OAupabf+lDheDGbVGJyupeYAsX5AHJbwgtPR+wlWCd0LDdwR8Z26V8attdfEemkJXP/qM0P5srN1mACBA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:12:38.837980Z","signed_message":"canonical_sha256_bytes"},"source_id":"2002.10440","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7049c410acb66b90349686bd0197803bb8bee14e79ffcdeb434d3aa072920fa5","sha256:005125d7c3533d56f8c4e71c8f4aed4485ee37c9aa2500c7bc97c10c41f18ed4"],"state_sha256":"fc0270831348fdd843de4390fddeeda3005e029b13a0b03c828911c5100da65c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1nHnPVH+sA5OAhL+cMHsw+f7H+uAf/AOPaBNNB4XzvQDgIiTIj6f6dDdcuUU7JjJxlj7aDyOSJHJYA0FO6ARCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T18:51:13.089709Z","bundle_sha256":"85591e3d3228acd35c3a831f6e497ef9d89d620a138e0c6d31c17a00de920b34"}}