{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:YIIMFQLYSHCTI7EJSV7C4X7CH6","short_pith_number":"pith:YIIMFQLY","canonical_record":{"source":{"id":"1711.02719","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-11-07T20:45:19Z","cross_cats_sorted":[],"title_canon_sha256":"5e388419e47cb16abb4e5e5d73cab9660b735dc08897d7cf983adce139c3cecb","abstract_canon_sha256":"77ee00d762413d895c7daf750433a855fb5c3156479917b8d27294a8f6b9ba3c"},"schema_version":"1.0"},"canonical_sha256":"c210c2c17891c5347c89957e2e5fe23fabdc02a374d0386b2b22724bfd3b091f","source":{"kind":"arxiv","id":"1711.02719","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.02719","created_at":"2026-05-18T00:31:01Z"},{"alias_kind":"arxiv_version","alias_value":"1711.02719v1","created_at":"2026-05-18T00:31:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.02719","created_at":"2026-05-18T00:31:01Z"},{"alias_kind":"pith_short_12","alias_value":"YIIMFQLYSHCT","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"YIIMFQLYSHCTI7EJ","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"YIIMFQLY","created_at":"2026-05-18T12:31:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:YIIMFQLYSHCTI7EJSV7C4X7CH6","target":"record","payload":{"canonical_record":{"source":{"id":"1711.02719","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-11-07T20:45:19Z","cross_cats_sorted":[],"title_canon_sha256":"5e388419e47cb16abb4e5e5d73cab9660b735dc08897d7cf983adce139c3cecb","abstract_canon_sha256":"77ee00d762413d895c7daf750433a855fb5c3156479917b8d27294a8f6b9ba3c"},"schema_version":"1.0"},"canonical_sha256":"c210c2c17891c5347c89957e2e5fe23fabdc02a374d0386b2b22724bfd3b091f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:31:01.997143Z","signature_b64":"D9ogAz0YLhnIlmdK6xguLoG3HEhmp/I+9q0AiWPddfWAMgQVX7qBdXgMwLqpx5MXmx/63Ezqbv+L30toulvvBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c210c2c17891c5347c89957e2e5fe23fabdc02a374d0386b2b22724bfd3b091f","last_reissued_at":"2026-05-18T00:31:01.996440Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:31:01.996440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1711.02719","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":"2026-05-18T00:31:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZifbWppPfqnX27bd8BD/KgQmdRb9zdwjSl3oTP2/Mo95PRB5KBJ/23eQ09kAdmunyV5ZRVqJVzTBkIR6SCvdAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T14:32:26.843923Z"},"content_sha256":"d5aff9fb1519209d726e41720f87774ca9a159ce2b7b2e354e7725c3f70ce8bd","schema_version":"1.0","event_id":"sha256:d5aff9fb1519209d726e41720f87774ca9a159ce2b7b2e354e7725c3f70ce8bd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:YIIMFQLYSHCTI7EJSV7C4X7CH6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observational Artifacts of NuSTAR: Ghost Rays and Stray Light","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Brian W. Grefenstette, Finn E. Christensen, Fiona A. Harrison, Hiromasa Miyasaka, Karl W. Forster, Kristin K. Madsen, Vikram Rana, William W. Craig","submitted_at":"2017-11-07T20:45:19Z","abstract_excerpt":"The Nuclear Spectroscopic Telescope Array (NuSTAR), launched in June 2012, flies two conical approximation Wolter-I mirrors at the end of a 10.15m mast. The optics are coated with multilayers of Pt/C and W/Si that operate from 3--80 keV. Since the optical path is not shrouded, aperture stops are used to limit the field of view from background and sources outside the field of view. However, there is still a sliver of sky (~1.0--4.0 degrees) where photons may bypass the optics altogether and fall directly on the detector array. We term these photons Stray-light. Additionally, there are also phot"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.02719","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":"2026-05-18T00:31:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p2CL9YsC9XfYDOBNsjg9YrWTuTlOQXXK8luJ3KK/aWH/nz67ngzFup9LW5lgXw+Mn1BDijRf1RyUSdp+PHcRBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T14:32:26.844622Z"},"content_sha256":"8317d758f48def6ebcc988e797c6d6ab469aa97e9d462a712640a0e6cfe7d512","schema_version":"1.0","event_id":"sha256:8317d758f48def6ebcc988e797c6d6ab469aa97e9d462a712640a0e6cfe7d512"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YIIMFQLYSHCTI7EJSV7C4X7CH6/bundle.json","state_url":"https://pith.science/pith/YIIMFQLYSHCTI7EJSV7C4X7CH6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YIIMFQLYSHCTI7EJSV7C4X7CH6/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":"2026-05-29T14:32:26Z","links":{"resolver":"https://pith.science/pith/YIIMFQLYSHCTI7EJSV7C4X7CH6","bundle":"https://pith.science/pith/YIIMFQLYSHCTI7EJSV7C4X7CH6/bundle.json","state":"https://pith.science/pith/YIIMFQLYSHCTI7EJSV7C4X7CH6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YIIMFQLYSHCTI7EJSV7C4X7CH6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:YIIMFQLYSHCTI7EJSV7C4X7CH6","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":"77ee00d762413d895c7daf750433a855fb5c3156479917b8d27294a8f6b9ba3c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-11-07T20:45:19Z","title_canon_sha256":"5e388419e47cb16abb4e5e5d73cab9660b735dc08897d7cf983adce139c3cecb"},"schema_version":"1.0","source":{"id":"1711.02719","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.02719","created_at":"2026-05-18T00:31:01Z"},{"alias_kind":"arxiv_version","alias_value":"1711.02719v1","created_at":"2026-05-18T00:31:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.02719","created_at":"2026-05-18T00:31:01Z"},{"alias_kind":"pith_short_12","alias_value":"YIIMFQLYSHCT","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"YIIMFQLYSHCTI7EJ","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"YIIMFQLY","created_at":"2026-05-18T12:31:56Z"}],"graph_snapshots":[{"event_id":"sha256:8317d758f48def6ebcc988e797c6d6ab469aa97e9d462a712640a0e6cfe7d512","target":"graph","created_at":"2026-05-18T00:31:01Z","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 Nuclear Spectroscopic Telescope Array (NuSTAR), launched in June 2012, flies two conical approximation Wolter-I mirrors at the end of a 10.15m mast. The optics are coated with multilayers of Pt/C and W/Si that operate from 3--80 keV. Since the optical path is not shrouded, aperture stops are used to limit the field of view from background and sources outside the field of view. However, there is still a sliver of sky (~1.0--4.0 degrees) where photons may bypass the optics altogether and fall directly on the detector array. We term these photons Stray-light. Additionally, there are also phot","authors_text":"Brian W. Grefenstette, Finn E. Christensen, Fiona A. Harrison, Hiromasa Miyasaka, Karl W. Forster, Kristin K. Madsen, Vikram Rana, William W. Craig","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-11-07T20:45:19Z","title":"Observational Artifacts of NuSTAR: Ghost Rays and Stray Light"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.02719","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:d5aff9fb1519209d726e41720f87774ca9a159ce2b7b2e354e7725c3f70ce8bd","target":"record","created_at":"2026-05-18T00:31:01Z","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":"77ee00d762413d895c7daf750433a855fb5c3156479917b8d27294a8f6b9ba3c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-11-07T20:45:19Z","title_canon_sha256":"5e388419e47cb16abb4e5e5d73cab9660b735dc08897d7cf983adce139c3cecb"},"schema_version":"1.0","source":{"id":"1711.02719","kind":"arxiv","version":1}},"canonical_sha256":"c210c2c17891c5347c89957e2e5fe23fabdc02a374d0386b2b22724bfd3b091f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c210c2c17891c5347c89957e2e5fe23fabdc02a374d0386b2b22724bfd3b091f","first_computed_at":"2026-05-18T00:31:01.996440Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:31:01.996440Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"D9ogAz0YLhnIlmdK6xguLoG3HEhmp/I+9q0AiWPddfWAMgQVX7qBdXgMwLqpx5MXmx/63Ezqbv+L30toulvvBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:31:01.997143Z","signed_message":"canonical_sha256_bytes"},"source_id":"1711.02719","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d5aff9fb1519209d726e41720f87774ca9a159ce2b7b2e354e7725c3f70ce8bd","sha256:8317d758f48def6ebcc988e797c6d6ab469aa97e9d462a712640a0e6cfe7d512"],"state_sha256":"2030bbd076a619888f35f34bde5918fa1353ca2b461dd882919c83359dda357d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0x8glSa1V7vCnO3Fbeny6FPfLOi8qGDfg+tkcGgrHUJHYRA4lvJtprMLEaMKtIJWZeq4FYs0tZoGnhDHz3GoAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T14:32:26.848337Z","bundle_sha256":"719d70e1b372339108d9d87acc056f93a2530d949d0470d717fab3d9e26234c2"}}