{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:DSK5DMU5QRVXWIRFAT5EZ6TMNC","short_pith_number":"pith:DSK5DMU5","canonical_record":{"source":{"id":"1901.09999","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-28T20:48:27Z","cross_cats_sorted":[],"title_canon_sha256":"eb7874d14944dcb0d0c38af392889cf2306a1c001da54e18941d38ef1b935e87","abstract_canon_sha256":"c5dfe3a0cf788f9c97bcc3cd238001e9d1c61fa1aafe6ec45caf74cd08d74783"},"schema_version":"1.0"},"canonical_sha256":"1c95d1b29d846b7b222504fa4cfa6c689f6c0a0e4efcb79899b38164ee3127bb","source":{"kind":"arxiv","id":"1901.09999","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.09999","created_at":"2026-05-17T23:55:16Z"},{"alias_kind":"arxiv_version","alias_value":"1901.09999v1","created_at":"2026-05-17T23:55:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.09999","created_at":"2026-05-17T23:55:16Z"},{"alias_kind":"pith_short_12","alias_value":"DSK5DMU5QRVX","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"DSK5DMU5QRVXWIRF","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"DSK5DMU5","created_at":"2026-05-18T12:33:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:DSK5DMU5QRVXWIRFAT5EZ6TMNC","target":"record","payload":{"canonical_record":{"source":{"id":"1901.09999","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-28T20:48:27Z","cross_cats_sorted":[],"title_canon_sha256":"eb7874d14944dcb0d0c38af392889cf2306a1c001da54e18941d38ef1b935e87","abstract_canon_sha256":"c5dfe3a0cf788f9c97bcc3cd238001e9d1c61fa1aafe6ec45caf74cd08d74783"},"schema_version":"1.0"},"canonical_sha256":"1c95d1b29d846b7b222504fa4cfa6c689f6c0a0e4efcb79899b38164ee3127bb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:16.395587Z","signature_b64":"yzJtEID/oqPP8jIcB3xlRO+EOzh76McXm/ttcKDYJa+ZScXpqQMB5pYjnLjTyZ/b9fyoEQR8E3R8XmeFQIbABw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1c95d1b29d846b7b222504fa4cfa6c689f6c0a0e4efcb79899b38164ee3127bb","last_reissued_at":"2026-05-17T23:55:16.395088Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:16.395088Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.09999","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":"2026-05-17T23:55:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zKlDrKhxjwo5rKWbkqET2YBJh3XELXGPwbG9HyE4chkvanQftkSLfP0Mj+CF5DpH05T/oWwsWJZwEcfC2C2vAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T14:47:27.533214Z"},"content_sha256":"afb3428935d892e8aa7026a39966723821fee6ba0cb253bf0e850049aa6b0bf0","schema_version":"1.0","event_id":"sha256:afb3428935d892e8aa7026a39966723821fee6ba0cb253bf0e850049aa6b0bf0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:DSK5DMU5QRVXWIRFAT5EZ6TMNC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Pan-STARRS PSF-Matching for Subtraction and Stacking","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Eugene A. Magnier (Institute for Astronomy, Paul A. Price (Department of Astrophysical Sciences, Princeton University), University of Hawaii)","submitted_at":"2019-01-28T20:48:27Z","abstract_excerpt":"We present the implementation and use of algorithms for matching point-spread functions (PSFs) within the Pan-STARRS Image Processing Pipeline (IPP). PSF-matching is an essential part of the IPP for the detection of supernovae and asteroids, but it is also used to homogenize the PSF of inputs to stacks, resulting in improved photometric precision compared to regular coaddition, especially in data with a high masked fraction. We report our experience in constructing and operating the image subtraction pipeline, and make recommendations about particular basis functions for constructing the PSF-m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.09999","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":"2026-05-17T23:55:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0A46t/OyqomaTqlVDli+yU3WiDgtAywQl/dfJxtBfaff4mFmjcNG3XkU1Tj8NuLyX8u8dt+cotZ+wXrxE7eRAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T14:47:27.533608Z"},"content_sha256":"ee404a3808c2a0b0936b229531af2ff0a23ba1f544bbd9df13c2c2dc0e9d8248","schema_version":"1.0","event_id":"sha256:ee404a3808c2a0b0936b229531af2ff0a23ba1f544bbd9df13c2c2dc0e9d8248"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DSK5DMU5QRVXWIRFAT5EZ6TMNC/bundle.json","state_url":"https://pith.science/pith/DSK5DMU5QRVXWIRFAT5EZ6TMNC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DSK5DMU5QRVXWIRFAT5EZ6TMNC/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":"2026-05-22T14:47:27Z","links":{"resolver":"https://pith.science/pith/DSK5DMU5QRVXWIRFAT5EZ6TMNC","bundle":"https://pith.science/pith/DSK5DMU5QRVXWIRFAT5EZ6TMNC/bundle.json","state":"https://pith.science/pith/DSK5DMU5QRVXWIRFAT5EZ6TMNC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DSK5DMU5QRVXWIRFAT5EZ6TMNC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:DSK5DMU5QRVXWIRFAT5EZ6TMNC","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":"c5dfe3a0cf788f9c97bcc3cd238001e9d1c61fa1aafe6ec45caf74cd08d74783","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-28T20:48:27Z","title_canon_sha256":"eb7874d14944dcb0d0c38af392889cf2306a1c001da54e18941d38ef1b935e87"},"schema_version":"1.0","source":{"id":"1901.09999","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.09999","created_at":"2026-05-17T23:55:16Z"},{"alias_kind":"arxiv_version","alias_value":"1901.09999v1","created_at":"2026-05-17T23:55:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.09999","created_at":"2026-05-17T23:55:16Z"},{"alias_kind":"pith_short_12","alias_value":"DSK5DMU5QRVX","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_16","alias_value":"DSK5DMU5QRVXWIRF","created_at":"2026-05-18T12:33:15Z"},{"alias_kind":"pith_short_8","alias_value":"DSK5DMU5","created_at":"2026-05-18T12:33:15Z"}],"graph_snapshots":[{"event_id":"sha256:ee404a3808c2a0b0936b229531af2ff0a23ba1f544bbd9df13c2c2dc0e9d8248","target":"graph","created_at":"2026-05-17T23:55:16Z","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 the implementation and use of algorithms for matching point-spread functions (PSFs) within the Pan-STARRS Image Processing Pipeline (IPP). PSF-matching is an essential part of the IPP for the detection of supernovae and asteroids, but it is also used to homogenize the PSF of inputs to stacks, resulting in improved photometric precision compared to regular coaddition, especially in data with a high masked fraction. We report our experience in constructing and operating the image subtraction pipeline, and make recommendations about particular basis functions for constructing the PSF-m","authors_text":"Eugene A. Magnier (Institute for Astronomy, Paul A. Price (Department of Astrophysical Sciences, Princeton University), University of Hawaii)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-28T20:48:27Z","title":"Pan-STARRS PSF-Matching for Subtraction and Stacking"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.09999","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:afb3428935d892e8aa7026a39966723821fee6ba0cb253bf0e850049aa6b0bf0","target":"record","created_at":"2026-05-17T23:55:16Z","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":"c5dfe3a0cf788f9c97bcc3cd238001e9d1c61fa1aafe6ec45caf74cd08d74783","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-01-28T20:48:27Z","title_canon_sha256":"eb7874d14944dcb0d0c38af392889cf2306a1c001da54e18941d38ef1b935e87"},"schema_version":"1.0","source":{"id":"1901.09999","kind":"arxiv","version":1}},"canonical_sha256":"1c95d1b29d846b7b222504fa4cfa6c689f6c0a0e4efcb79899b38164ee3127bb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1c95d1b29d846b7b222504fa4cfa6c689f6c0a0e4efcb79899b38164ee3127bb","first_computed_at":"2026-05-17T23:55:16.395088Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:16.395088Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yzJtEID/oqPP8jIcB3xlRO+EOzh76McXm/ttcKDYJa+ZScXpqQMB5pYjnLjTyZ/b9fyoEQR8E3R8XmeFQIbABw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:16.395587Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.09999","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:afb3428935d892e8aa7026a39966723821fee6ba0cb253bf0e850049aa6b0bf0","sha256:ee404a3808c2a0b0936b229531af2ff0a23ba1f544bbd9df13c2c2dc0e9d8248"],"state_sha256":"5064ff272d6732a5843740ba368a73a0c5066bf021150e7a7b9e2fa8b65d4e5f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"orGEY4q9yRManjFvhR3s+kBkDxiFiVJ2L6k1Pjd1k8JovfavQLbBDPRoL0tQOsj3yW2ParniXGR23NP0b8pMAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T14:47:27.535916Z","bundle_sha256":"f6fbd05751fc8a89b1816993a53a0b95590ff04decac5c5a8c2f46c9a59007c8"}}