{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:F74BIFTBUXWQ6UCFPQ5OXLIC3Q","short_pith_number":"pith:F74BIFTB","canonical_record":{"source":{"id":"1512.04655","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-12-15T06:09:39Z","cross_cats_sorted":[],"title_canon_sha256":"3d660aa4b2ad383f451c32a9dc9f3ca45a47d6e2c5ca91d274c9af8e22d2bb6b","abstract_canon_sha256":"79e38341df784e8215a603f4106e29c60541a6127642d44098cee327069aff3f"},"schema_version":"1.0"},"canonical_sha256":"2ff8141661a5ed0f50457c3aebad02dc2bb4c22f3958d71e9351287cf716f161","source":{"kind":"arxiv","id":"1512.04655","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.04655","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"arxiv_version","alias_value":"1512.04655v1","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.04655","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"pith_short_12","alias_value":"F74BIFTBUXWQ","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"F74BIFTBUXWQ6UCF","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"F74BIFTB","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:F74BIFTBUXWQ6UCFPQ5OXLIC3Q","target":"record","payload":{"canonical_record":{"source":{"id":"1512.04655","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-12-15T06:09:39Z","cross_cats_sorted":[],"title_canon_sha256":"3d660aa4b2ad383f451c32a9dc9f3ca45a47d6e2c5ca91d274c9af8e22d2bb6b","abstract_canon_sha256":"79e38341df784e8215a603f4106e29c60541a6127642d44098cee327069aff3f"},"schema_version":"1.0"},"canonical_sha256":"2ff8141661a5ed0f50457c3aebad02dc2bb4c22f3958d71e9351287cf716f161","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:22:00.080503Z","signature_b64":"8qwUxd+bRN7mb+gEkXF5iX5Ncbbe9OxXm7dxfZcRzcQU30kHEgOSu7xSkr8fLoWoKIclXt6LelfmoyPQoHv/Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2ff8141661a5ed0f50457c3aebad02dc2bb4c22f3958d71e9351287cf716f161","last_reissued_at":"2026-05-18T01:22:00.080021Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:22:00.080021Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1512.04655","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":"2026-05-18T01:22:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ixi7Uaj4sn0VHqPkqFX4JpLzwgAwcZpQ5CVW2CZd5pVVu/wxXnWWZq148MEHhVs/fr84gIp2bgMAwDe61VBRDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T19:55:08.834497Z"},"content_sha256":"6ea9f411b41c49491d874278e7f19560d4308730a8c04cac3b288616261d8c84","schema_version":"1.0","event_id":"sha256:6ea9f411b41c49491d874278e7f19560d4308730a8c04cac3b288616261d8c84"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:F74BIFTBUXWQ6UCFPQ5OXLIC3Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Difference image analysis: Automatic kernel design using information criteria","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"D.M. Bramich, D. Mislis, E. Bachelet, K.A. Alsubai, Keith Horne, N. Parley","submitted_at":"2015-12-15T06:09:39Z","abstract_excerpt":"We present a selection of methods for automatically constructing an optimal kernel model for difference image analysis which require very few external parameters to control the kernel design. Each method consists of two components; namely, a kernel design algorithm to generate a set of candidate kernel models, and a model selection criterion to select the simplest kernel model from the candidate models that provides a sufficiently good fit to the target image. We restricted our attention to the case of solving for a spatially-invariant convolution kernel composed of delta basis functions, and "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.04655","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":"2026-05-18T01:22:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zlmdE9Qm7KwtCDX5lmkj1jtC+iBWMjTluG2eaipFPYKGZlpJf+xzs3fX+g76/VQ+g63fR8R9cc6kJ7+43SyqBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T19:55:08.834978Z"},"content_sha256":"fd238efc93d012ed2baf0b82b3ea0d5efa412517a2e0c48a9035ff7713f33673","schema_version":"1.0","event_id":"sha256:fd238efc93d012ed2baf0b82b3ea0d5efa412517a2e0c48a9035ff7713f33673"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/F74BIFTBUXWQ6UCFPQ5OXLIC3Q/bundle.json","state_url":"https://pith.science/pith/F74BIFTBUXWQ6UCFPQ5OXLIC3Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/F74BIFTBUXWQ6UCFPQ5OXLIC3Q/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":"2026-05-31T19:55:08Z","links":{"resolver":"https://pith.science/pith/F74BIFTBUXWQ6UCFPQ5OXLIC3Q","bundle":"https://pith.science/pith/F74BIFTBUXWQ6UCFPQ5OXLIC3Q/bundle.json","state":"https://pith.science/pith/F74BIFTBUXWQ6UCFPQ5OXLIC3Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/F74BIFTBUXWQ6UCFPQ5OXLIC3Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:F74BIFTBUXWQ6UCFPQ5OXLIC3Q","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":"79e38341df784e8215a603f4106e29c60541a6127642d44098cee327069aff3f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-12-15T06:09:39Z","title_canon_sha256":"3d660aa4b2ad383f451c32a9dc9f3ca45a47d6e2c5ca91d274c9af8e22d2bb6b"},"schema_version":"1.0","source":{"id":"1512.04655","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1512.04655","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"arxiv_version","alias_value":"1512.04655v1","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1512.04655","created_at":"2026-05-18T01:22:00Z"},{"alias_kind":"pith_short_12","alias_value":"F74BIFTBUXWQ","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"F74BIFTBUXWQ6UCF","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"F74BIFTB","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:fd238efc93d012ed2baf0b82b3ea0d5efa412517a2e0c48a9035ff7713f33673","target":"graph","created_at":"2026-05-18T01:22:00Z","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":"We present a selection of methods for automatically constructing an optimal kernel model for difference image analysis which require very few external parameters to control the kernel design. Each method consists of two components; namely, a kernel design algorithm to generate a set of candidate kernel models, and a model selection criterion to select the simplest kernel model from the candidate models that provides a sufficiently good fit to the target image. We restricted our attention to the case of solving for a spatially-invariant convolution kernel composed of delta basis functions, and ","authors_text":"D.M. Bramich, D. Mislis, E. Bachelet, K.A. Alsubai, Keith Horne, N. Parley","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-12-15T06:09:39Z","title":"Difference image analysis: Automatic kernel design using information criteria"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1512.04655","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":"sha256:6ea9f411b41c49491d874278e7f19560d4308730a8c04cac3b288616261d8c84","target":"record","created_at":"2026-05-18T01:22:00Z","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":"79e38341df784e8215a603f4106e29c60541a6127642d44098cee327069aff3f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-12-15T06:09:39Z","title_canon_sha256":"3d660aa4b2ad383f451c32a9dc9f3ca45a47d6e2c5ca91d274c9af8e22d2bb6b"},"schema_version":"1.0","source":{"id":"1512.04655","kind":"arxiv","version":1}},"canonical_sha256":"2ff8141661a5ed0f50457c3aebad02dc2bb4c22f3958d71e9351287cf716f161","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2ff8141661a5ed0f50457c3aebad02dc2bb4c22f3958d71e9351287cf716f161","first_computed_at":"2026-05-18T01:22:00.080021Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:00.080021Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8qwUxd+bRN7mb+gEkXF5iX5Ncbbe9OxXm7dxfZcRzcQU30kHEgOSu7xSkr8fLoWoKIclXt6LelfmoyPQoHv/Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:00.080503Z","signed_message":"canonical_sha256_bytes"},"source_id":"1512.04655","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6ea9f411b41c49491d874278e7f19560d4308730a8c04cac3b288616261d8c84","sha256:fd238efc93d012ed2baf0b82b3ea0d5efa412517a2e0c48a9035ff7713f33673"],"state_sha256":"f19fccb3bdcd6f95e1aa762f5398e6f6d6574ff5c51d94f68877f96a2c496653"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rshaV+RrAEPYccPO/jRK5xEp79D6czK7ITlKLsdgDyg/nRKTDSqUoQE3Io6BxR0tRATiLPKXvvNZzrSNxFWEAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T19:55:08.838963Z","bundle_sha256":"c747e35a4c911e49ae97f6d5238c543a68932003067e3a5289dbcd219ea2b20c"}}