{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:MI6BKLSGNU2X4YG3A2ASGRC4D2","short_pith_number":"pith:MI6BKLSG","canonical_record":{"source":{"id":"1406.0507","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-06-02T20:00:14Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"a6fe7ad34d2f6a903d868108a1dec88ab5216c704558d4f7b86d188caf0dac1d","abstract_canon_sha256":"a32f38c1b0465924e7c0a9251651685ba0d5be5e7014e1485cdffe17f325403e"},"schema_version":"1.0"},"canonical_sha256":"623c152e466d357e60db068123445c1e989df48887bbf24e6e29868414087200","source":{"kind":"arxiv","id":"1406.0507","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.0507","created_at":"2026-05-18T02:38:29Z"},{"alias_kind":"arxiv_version","alias_value":"1406.0507v2","created_at":"2026-05-18T02:38:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.0507","created_at":"2026-05-18T02:38:29Z"},{"alias_kind":"pith_short_12","alias_value":"MI6BKLSGNU2X","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"MI6BKLSGNU2X4YG3","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"MI6BKLSG","created_at":"2026-05-18T12:28:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:MI6BKLSGNU2X4YG3A2ASGRC4D2","target":"record","payload":{"canonical_record":{"source":{"id":"1406.0507","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-06-02T20:00:14Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"a6fe7ad34d2f6a903d868108a1dec88ab5216c704558d4f7b86d188caf0dac1d","abstract_canon_sha256":"a32f38c1b0465924e7c0a9251651685ba0d5be5e7014e1485cdffe17f325403e"},"schema_version":"1.0"},"canonical_sha256":"623c152e466d357e60db068123445c1e989df48887bbf24e6e29868414087200","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:38:29.519820Z","signature_b64":"h2Ntlw4vS0j7X82Zi0QtQcllBnNpSV0BnQUo+iYGf2LBPupoyrpgbA+rgD1LPGP886YNqADJEy0LTWF87VJvDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"623c152e466d357e60db068123445c1e989df48887bbf24e6e29868414087200","last_reissued_at":"2026-05-18T02:38:29.519067Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:38:29.519067Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1406.0507","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:38:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xLMQAufr/skjhcXHZXmbX2ORkdikxk3WQ6hS7ML4sJpMMm8iAubg50mEtndmcTUekSAyER6qww8dU3DuFuy1Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T16:48:17.486035Z"},"content_sha256":"0176e8b6eb04fa1622d632f33d8fb9badd5ad05fc8ac107fa99d00faaeb67bc0","schema_version":"1.0","event_id":"sha256:0176e8b6eb04fa1622d632f33d8fb9badd5ad05fc8ac107fa99d00faaeb67bc0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:MI6BKLSGNU2X4YG3A2ASGRC4D2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Sharper Fermi LAT Images: instrument response functions for an improved event selection","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.IM","authors_text":"Douglas P. Finkbeiner, Stephen K. N. Portillo","submitted_at":"2014-06-02T20:00:14Z","abstract_excerpt":"The Large Area Telescope on the Fermi Gamma-ray Space Telescope has a point spread function with large tails, consisting of events affected by tracker ineffiencies, inactive volumes, and hard scattering; these tails can make source confusion a limiting factor. The parameter CTBCORE, available in the publicly available Extended Fermi LAT data, estimates the quality of each event's direction reconstruction; by implementing a cut in this parameter, the tails of the point spread function can be suppressed at the cost of losing effective area. We implement cuts on CTBCORE and present updated instru"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.0507","kind":"arxiv","version":2},"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":"2026-05-18T02:38:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"88Qhhct5ny4CSY5fQ1znCTUSK4i/jJY8c05s3XuiLJZLvlC99/3fDhHMmzLBF/gYXQBcEPU0vfduEQq0y+oDAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T16:48:17.486700Z"},"content_sha256":"53462f8cd50b18274eed5f7b4ab613ce36a4692df694e68126abd4febaad72ae","schema_version":"1.0","event_id":"sha256:53462f8cd50b18274eed5f7b4ab613ce36a4692df694e68126abd4febaad72ae"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MI6BKLSGNU2X4YG3A2ASGRC4D2/bundle.json","state_url":"https://pith.science/pith/MI6BKLSGNU2X4YG3A2ASGRC4D2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MI6BKLSGNU2X4YG3A2ASGRC4D2/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":"2026-05-28T16:48:17Z","links":{"resolver":"https://pith.science/pith/MI6BKLSGNU2X4YG3A2ASGRC4D2","bundle":"https://pith.science/pith/MI6BKLSGNU2X4YG3A2ASGRC4D2/bundle.json","state":"https://pith.science/pith/MI6BKLSGNU2X4YG3A2ASGRC4D2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MI6BKLSGNU2X4YG3A2ASGRC4D2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:MI6BKLSGNU2X4YG3A2ASGRC4D2","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":"a32f38c1b0465924e7c0a9251651685ba0d5be5e7014e1485cdffe17f325403e","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-06-02T20:00:14Z","title_canon_sha256":"a6fe7ad34d2f6a903d868108a1dec88ab5216c704558d4f7b86d188caf0dac1d"},"schema_version":"1.0","source":{"id":"1406.0507","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.0507","created_at":"2026-05-18T02:38:29Z"},{"alias_kind":"arxiv_version","alias_value":"1406.0507v2","created_at":"2026-05-18T02:38:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.0507","created_at":"2026-05-18T02:38:29Z"},{"alias_kind":"pith_short_12","alias_value":"MI6BKLSGNU2X","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"MI6BKLSGNU2X4YG3","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"MI6BKLSG","created_at":"2026-05-18T12:28:38Z"}],"graph_snapshots":[{"event_id":"sha256:53462f8cd50b18274eed5f7b4ab613ce36a4692df694e68126abd4febaad72ae","target":"graph","created_at":"2026-05-18T02:38:29Z","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 Large Area Telescope on the Fermi Gamma-ray Space Telescope has a point spread function with large tails, consisting of events affected by tracker ineffiencies, inactive volumes, and hard scattering; these tails can make source confusion a limiting factor. The parameter CTBCORE, available in the publicly available Extended Fermi LAT data, estimates the quality of each event's direction reconstruction; by implementing a cut in this parameter, the tails of the point spread function can be suppressed at the cost of losing effective area. We implement cuts on CTBCORE and present updated instru","authors_text":"Douglas P. Finkbeiner, Stephen K. N. Portillo","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-06-02T20:00:14Z","title":"Sharper Fermi LAT Images: instrument response functions for an improved event selection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.0507","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":"sha256:0176e8b6eb04fa1622d632f33d8fb9badd5ad05fc8ac107fa99d00faaeb67bc0","target":"record","created_at":"2026-05-18T02:38:29Z","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":"a32f38c1b0465924e7c0a9251651685ba0d5be5e7014e1485cdffe17f325403e","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-06-02T20:00:14Z","title_canon_sha256":"a6fe7ad34d2f6a903d868108a1dec88ab5216c704558d4f7b86d188caf0dac1d"},"schema_version":"1.0","source":{"id":"1406.0507","kind":"arxiv","version":2}},"canonical_sha256":"623c152e466d357e60db068123445c1e989df48887bbf24e6e29868414087200","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"623c152e466d357e60db068123445c1e989df48887bbf24e6e29868414087200","first_computed_at":"2026-05-18T02:38:29.519067Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:38:29.519067Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"h2Ntlw4vS0j7X82Zi0QtQcllBnNpSV0BnQUo+iYGf2LBPupoyrpgbA+rgD1LPGP886YNqADJEy0LTWF87VJvDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:38:29.519820Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.0507","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0176e8b6eb04fa1622d632f33d8fb9badd5ad05fc8ac107fa99d00faaeb67bc0","sha256:53462f8cd50b18274eed5f7b4ab613ce36a4692df694e68126abd4febaad72ae"],"state_sha256":"bb1a9d2eb4046b7177476c9e2e61a4e4c63ab9c0618fbd71660ceb754566a500"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bSdYRu3AgNhg4DYwyFXnGTChbsjcc/xYVWiT2KH0MfbbqgthoknBeDhC+wAGepdjXFHAXX5YpLyjl1pVScT/Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T16:48:17.490199Z","bundle_sha256":"db3b04e4d9ccd5828ba564bd889a90717f885976d6c6da7431afe7f5675245be"}}