{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:LGUG5FEGU7E67QA44FY5XD7H4S","short_pith_number":"pith:LGUG5FEG","canonical_record":{"source":{"id":"0905.3003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-05-18T22:58:40Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"a3e05f9f196a414f02375614e76f66f699fbfd32cdf5d26f4e879677482de488","abstract_canon_sha256":"89ad8f6e769cbf45c768b92b84e24af962a1824d991c861aacee55fea1ae65a3"},"schema_version":"1.0"},"canonical_sha256":"59a86e9486a7c9efc01ce171db8fe7e48ed7e532f4bc86322237d5a1cedbacf1","source":{"kind":"arxiv","id":"0905.3003","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.3003","created_at":"2026-05-18T02:13:38Z"},{"alias_kind":"arxiv_version","alias_value":"0905.3003v1","created_at":"2026-05-18T02:13:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.3003","created_at":"2026-05-18T02:13:38Z"},{"alias_kind":"pith_short_12","alias_value":"LGUG5FEGU7E6","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"LGUG5FEGU7E67QA4","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"LGUG5FEG","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:LGUG5FEGU7E67QA44FY5XD7H4S","target":"record","payload":{"canonical_record":{"source":{"id":"0905.3003","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-05-18T22:58:40Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"a3e05f9f196a414f02375614e76f66f699fbfd32cdf5d26f4e879677482de488","abstract_canon_sha256":"89ad8f6e769cbf45c768b92b84e24af962a1824d991c861aacee55fea1ae65a3"},"schema_version":"1.0"},"canonical_sha256":"59a86e9486a7c9efc01ce171db8fe7e48ed7e532f4bc86322237d5a1cedbacf1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:38.770805Z","signature_b64":"NCr1O+Ye6cMTuNx5YhGADR1l/enmKkS6SLd2kKWmPmMFghLHCHGRv3GUTAsm31iU0s1AOckV/CWd30PmRY/DBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"59a86e9486a7c9efc01ce171db8fe7e48ed7e532f4bc86322237d5a1cedbacf1","last_reissued_at":"2026-05-18T02:13:38.770396Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:38.770396Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0905.3003","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":"2026-05-18T02:13:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dqH1bE5j43VmyJyS4BdGCwfBQ0i5u4Q2aZmBmz7KK98rSgQYyKV3NzACQnthiQW+VgQ0+gbyyAXsUeJ0lnwBAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T15:48:16.138691Z"},"content_sha256":"15cb7e61f9d560b4580a7b14c0ae53b570b16495a2212e5351145f43cae481c4","schema_version":"1.0","event_id":"sha256:15cb7e61f9d560b4580a7b14c0ae53b570b16495a2212e5351145f43cae481c4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:LGUG5FEGU7E67QA44FY5XD7H4S","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Difference imaging photometry of blended gravitational microlensing events with a numerical kernel","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.SR","authors_text":"A. Cassan, A. Williams, C. Coutures, D. Dominis Prester, D. Kubas, D. M. Bramich, D. P. Bennett, J.-B. Marquette, J. Donatowicz, J. Greenhill, J. Menzies, J.-P. Beaulieu, J. Wambsganss, K. C. Sahu, K. Horne, K. R. Pollard, M. D. Albrow, M. Zub (the PLANET Collaboration), N. Kains, P. Fouqu\\'e, S. Brillant, S. Dieters, S. R. Kane, V. Batista, V. R. Miller, Y. Tsapras","submitted_at":"2009-05-18T22:58:40Z","abstract_excerpt":"The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with knowledge of the statistical f"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.3003","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":"2026-05-18T02:13:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DVHo7duEH3y32eLNT+WyKExhujNy4XFSw6zuZddrmONv163Rd2H84UpYSD5twgWEOvin8pHMQv8X7smNxeQdBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T15:48:16.139042Z"},"content_sha256":"23da0b4edbecb112aa7d64548af020fc39a7fd3a206877ff19f59866e8b1cace","schema_version":"1.0","event_id":"sha256:23da0b4edbecb112aa7d64548af020fc39a7fd3a206877ff19f59866e8b1cace"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LGUG5FEGU7E67QA44FY5XD7H4S/bundle.json","state_url":"https://pith.science/pith/LGUG5FEGU7E67QA44FY5XD7H4S/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LGUG5FEGU7E67QA44FY5XD7H4S/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":"2026-06-05T15:48:16Z","links":{"resolver":"https://pith.science/pith/LGUG5FEGU7E67QA44FY5XD7H4S","bundle":"https://pith.science/pith/LGUG5FEGU7E67QA44FY5XD7H4S/bundle.json","state":"https://pith.science/pith/LGUG5FEGU7E67QA44FY5XD7H4S/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LGUG5FEGU7E67QA44FY5XD7H4S/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:LGUG5FEGU7E67QA44FY5XD7H4S","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":"89ad8f6e769cbf45c768b92b84e24af962a1824d991c861aacee55fea1ae65a3","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-05-18T22:58:40Z","title_canon_sha256":"a3e05f9f196a414f02375614e76f66f699fbfd32cdf5d26f4e879677482de488"},"schema_version":"1.0","source":{"id":"0905.3003","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.3003","created_at":"2026-05-18T02:13:38Z"},{"alias_kind":"arxiv_version","alias_value":"0905.3003v1","created_at":"2026-05-18T02:13:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.3003","created_at":"2026-05-18T02:13:38Z"},{"alias_kind":"pith_short_12","alias_value":"LGUG5FEGU7E6","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"LGUG5FEGU7E67QA4","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"LGUG5FEG","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:23da0b4edbecb112aa7d64548af020fc39a7fd3a206877ff19f59866e8b1cace","target":"graph","created_at":"2026-05-18T02:13:38Z","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"},"paper":{"abstract_excerpt":"The numerical kernel approach to difference imaging has been implemented and applied to gravitational microlensing events observed by the PLANET collaboration. The effect of an error in the source-star coordinates is explored and a new algorithm is presented for determining the precise coordinates of the microlens in blended events, essential for accurate photometry of difference images. It is shown how the photometric reference flux need not be measured directly from the reference image but can be obtained from measurements of the difference images combined with knowledge of the statistical f","authors_text":"A. Cassan, A. Williams, C. Coutures, D. Dominis Prester, D. Kubas, D. M. Bramich, D. P. Bennett, J.-B. Marquette, J. Donatowicz, J. Greenhill, J. Menzies, J.-P. Beaulieu, J. Wambsganss, K. C. Sahu, K. Horne, K. R. Pollard, M. D. Albrow, M. Zub (the PLANET Collaboration), N. Kains, P. Fouqu\\'e, S. Brillant, S. Dieters, S. R. Kane, V. Batista, V. R. Miller, Y. Tsapras","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-05-18T22:58:40Z","title":"Difference imaging photometry of blended gravitational microlensing events with a numerical kernel"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.3003","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":"sha256:15cb7e61f9d560b4580a7b14c0ae53b570b16495a2212e5351145f43cae481c4","target":"record","created_at":"2026-05-18T02:13:38Z","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":"89ad8f6e769cbf45c768b92b84e24af962a1824d991c861aacee55fea1ae65a3","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2009-05-18T22:58:40Z","title_canon_sha256":"a3e05f9f196a414f02375614e76f66f699fbfd32cdf5d26f4e879677482de488"},"schema_version":"1.0","source":{"id":"0905.3003","kind":"arxiv","version":1}},"canonical_sha256":"59a86e9486a7c9efc01ce171db8fe7e48ed7e532f4bc86322237d5a1cedbacf1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"59a86e9486a7c9efc01ce171db8fe7e48ed7e532f4bc86322237d5a1cedbacf1","first_computed_at":"2026-05-18T02:13:38.770396Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:38.770396Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NCr1O+Ye6cMTuNx5YhGADR1l/enmKkS6SLd2kKWmPmMFghLHCHGRv3GUTAsm31iU0s1AOckV/CWd30PmRY/DBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:38.770805Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.3003","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:15cb7e61f9d560b4580a7b14c0ae53b570b16495a2212e5351145f43cae481c4","sha256:23da0b4edbecb112aa7d64548af020fc39a7fd3a206877ff19f59866e8b1cace"],"state_sha256":"9de8de4af7ee3e6b62cc402cc67ee77634f67d4d26d2f84abb09832b83bc6af7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QLOtjHU7F8Plv71ryD2yNtB4dyj3AXTTImvxgUqPi5/5K4aJ2LG2JKa44KC6ZPrvXTdMrpLwRB9zACmBAbsCBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T15:48:16.141347Z","bundle_sha256":"eabe2e73abfd9d875a7978d036f04270f6abfa48cc60d67e32cf3990d1e699f1"}}