{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:U5BBSE2RB4SUDGCMMUUXJGZQR4","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":"40f26b280726ef7bf34a1215e73b4a866836a74960ecf7137ddcfd54b7e78bd2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-05T01:12:55Z","title_canon_sha256":"9d60e386db350bb7ba78758852407519ff78cc8f452355e62a3ba4e844d13617"},"schema_version":"1.0","source":{"id":"1608.01733","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.01733","created_at":"2026-05-18T00:55:12Z"},{"alias_kind":"arxiv_version","alias_value":"1608.01733v2","created_at":"2026-05-18T00:55:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.01733","created_at":"2026-05-18T00:55:12Z"},{"alias_kind":"pith_short_12","alias_value":"U5BBSE2RB4SU","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_16","alias_value":"U5BBSE2RB4SUDGCM","created_at":"2026-05-18T12:30:46Z"},{"alias_kind":"pith_short_8","alias_value":"U5BBSE2R","created_at":"2026-05-18T12:30:46Z"}],"graph_snapshots":[{"event_id":"sha256:965b8a3b82a5f41f7f6b03a88c83c52bc5fb17ec31560424381c70081709b7a2","target":"graph","created_at":"2026-05-18T00:55:12Z","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 describe the near real-time transient-source discovery engine for the intermediate Palomar Transient Factory (iPTF), currently in operations at the Infrared Processing and Analysis Center (IPAC), Caltech. We coin this system the IPAC/iPTF Discovery Engine (or IDE). We review the algorithms used for PSF-matching, image subtraction, detection, photometry, and machine-learned (ML) vetting of extracted transient candidates. We also review the performance of our ML classifier. For a limiting signal-to-noise ratio of 4 in relatively unconfused regions, \"bogus\" candidates from processing artifacts","authors_text":"Adam Miller, Carl Grillmair, David Shupe, Ed Jackson, Eran Ofek, Eric Bellm, Frank Masci (1), Gary Doran, George Helou, Jason Surace, Lin Yan, Lisa Storrie-Lombardi, Mansi Kasliwal, Russ Laher, S. Bradley Cenko, Shrinivas Kulkarni ((1) California Institute of Technology), Thomas Prince, Tom Barlow, Umaa Rebbapragada, Yi Cao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-05T01:12:55Z","title":"The IPAC Image Subtraction and Discovery Pipeline for the intermediate Palomar Transient Factory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.01733","kind":"arxiv","version":2},"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":"sha256:61d1637f626b7e7c67a1083807815f64f60b98b6db20a5d53a9bbbaeba5a6f39","target":"record","created_at":"2026-05-18T00:55:12Z","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":"40f26b280726ef7bf34a1215e73b4a866836a74960ecf7137ddcfd54b7e78bd2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-05T01:12:55Z","title_canon_sha256":"9d60e386db350bb7ba78758852407519ff78cc8f452355e62a3ba4e844d13617"},"schema_version":"1.0","source":{"id":"1608.01733","kind":"arxiv","version":2}},"canonical_sha256":"a7421913510f2541984c6529749b308f13c164ec2710c2263d29592bb8ebbaf5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a7421913510f2541984c6529749b308f13c164ec2710c2263d29592bb8ebbaf5","first_computed_at":"2026-05-18T00:55:12.755443Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:55:12.755443Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oxzlc2wG1/zxBuYEW837igcMILht1bsu9gz/sjseloBl4Q7Sap15hyMwEKP1yfES6/zLzU4lcJe3XRqHdS9OCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:55:12.755897Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.01733","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:61d1637f626b7e7c67a1083807815f64f60b98b6db20a5d53a9bbbaeba5a6f39","sha256:965b8a3b82a5f41f7f6b03a88c83c52bc5fb17ec31560424381c70081709b7a2"],"state_sha256":"80567797edcab32f88fdef645594c491e832223caa350acfc1599c8de69fc77a"}