{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:IK4IVQYWAAYZTU6SW7FWW5FRUH","short_pith_number":"pith:IK4IVQYW","canonical_record":{"source":{"id":"2204.09674","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2022-04-21T15:31:44Z","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"title_canon_sha256":"83ecb0e15396d077a9dd9b79d7b11c9849d1e454575c41110d033f8615e223e6","abstract_canon_sha256":"c14fea348ad3f393e70731366311d645c5403dded27c1a5d9eb6f9a098ee3aa7"},"schema_version":"1.0"},"canonical_sha256":"42b88ac316003199d3d2b7cb6b74b1a1e901e137b69f8e8e27f03e058057f2d8","source":{"kind":"arxiv","id":"2204.09674","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.09674","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"arxiv_version","alias_value":"2204.09674v1","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.09674","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"pith_short_12","alias_value":"IK4IVQYWAAYZ","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"pith_short_16","alias_value":"IK4IVQYWAAYZTU6S","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"pith_short_8","alias_value":"IK4IVQYW","created_at":"2026-07-05T06:07:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:IK4IVQYWAAYZTU6SW7FWW5FRUH","target":"record","payload":{"canonical_record":{"source":{"id":"2204.09674","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2022-04-21T15:31:44Z","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"title_canon_sha256":"83ecb0e15396d077a9dd9b79d7b11c9849d1e454575c41110d033f8615e223e6","abstract_canon_sha256":"c14fea348ad3f393e70731366311d645c5403dded27c1a5d9eb6f9a098ee3aa7"},"schema_version":"1.0"},"canonical_sha256":"42b88ac316003199d3d2b7cb6b74b1a1e901e137b69f8e8e27f03e058057f2d8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:07:20.300724Z","signature_b64":"rjKkJG2ivsVyQ3bqEqONF/30XbXbPJqfpgBg6jBL6yivIuQpSsW/rmZMpI2fMeo/H74BS9F4GNeeM+ygNQIsDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"42b88ac316003199d3d2b7cb6b74b1a1e901e137b69f8e8e27f03e058057f2d8","last_reissued_at":"2026-07-05T06:07:20.300256Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:07:20.300256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2204.09674","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":"2026-07-05T06:07:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DSKeUaM1e73COmN3cU1EEImniitqwDq/QhAJjeWvH37ZRwSM9x2w5QJpgWxHs6dw9NLz26nqo08dQWGhUnX0Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-22T08:49:28.691868Z"},"content_sha256":"3d4ccbf43d88a0f528d39a1cdadecb1859edce3c64c2b7f187c77aa6c9884ebc","schema_version":"1.0","event_id":"sha256:3d4ccbf43d88a0f528d39a1cdadecb1859edce3c64c2b7f187c77aa6c9884ebc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:IK4IVQYWAAYZTU6SW7FWW5FRUH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measurement of the vertical atmospheric density profile from the X-ray Earth occultation of the Crab Nebula with Insight-HXMT","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","astro-ph.IM"],"primary_cat":"astro-ph.EP","authors_text":"Aoying Wang, Baoquan Li, Bingxian Luo, Daochun Yu, Haitao Li, Mingyu Ge, Wangchen Xue, Xiaobo Li, Yajun Zhu, Yaning Liu, YouLi Tuo","submitted_at":"2022-04-21T15:31:44Z","abstract_excerpt":"In this paper, the X-ray Earth occultation (XEO) of the Crab Nebula is investigated by using the Hard X-ray Modulation Telescope (Insight-HXMT). The pointing observation data on the 30th September, 2018 recorded by the Low Energy X-ray telescope (LE) of Insight-HXMT are selected and analyzed. The extinction lightcurves and spectra during the X-ray Earth occultation process are extracted. A forward model for the XEO lightcurve is established and the theoretical observational signal for lightcurve is predicted. The atmospheric density model is built with a scale factor to the commonly used MSIS "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.09674","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2204.09674/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T06:07:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PDI0wIJ8UOeddmdUYPVelkJN41WEjDynX3O723SFUDAgOUw53NBajDJypx/Ah+uJI8zjUEFAQzciFuR5JchQBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-22T08:49:28.692236Z"},"content_sha256":"e42cf16b2d7310c18aa279930ec93e6509259a967aa95e1b07eb5ed13614892a","schema_version":"1.0","event_id":"sha256:e42cf16b2d7310c18aa279930ec93e6509259a967aa95e1b07eb5ed13614892a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IK4IVQYWAAYZTU6SW7FWW5FRUH/bundle.json","state_url":"https://pith.science/pith/IK4IVQYWAAYZTU6SW7FWW5FRUH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IK4IVQYWAAYZTU6SW7FWW5FRUH/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":"2026-07-22T08:49:28Z","links":{"resolver":"https://pith.science/pith/IK4IVQYWAAYZTU6SW7FWW5FRUH","bundle":"https://pith.science/pith/IK4IVQYWAAYZTU6SW7FWW5FRUH/bundle.json","state":"https://pith.science/pith/IK4IVQYWAAYZTU6SW7FWW5FRUH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IK4IVQYWAAYZTU6SW7FWW5FRUH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:IK4IVQYWAAYZTU6SW7FWW5FRUH","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":"c14fea348ad3f393e70731366311d645c5403dded27c1a5d9eb6f9a098ee3aa7","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2022-04-21T15:31:44Z","title_canon_sha256":"83ecb0e15396d077a9dd9b79d7b11c9849d1e454575c41110d033f8615e223e6"},"schema_version":"1.0","source":{"id":"2204.09674","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.09674","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"arxiv_version","alias_value":"2204.09674v1","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.09674","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"pith_short_12","alias_value":"IK4IVQYWAAYZ","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"pith_short_16","alias_value":"IK4IVQYWAAYZTU6S","created_at":"2026-07-05T06:07:20Z"},{"alias_kind":"pith_short_8","alias_value":"IK4IVQYW","created_at":"2026-07-05T06:07:20Z"}],"graph_snapshots":[{"event_id":"sha256:e42cf16b2d7310c18aa279930ec93e6509259a967aa95e1b07eb5ed13614892a","target":"graph","created_at":"2026-07-05T06:07:20Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2204.09674/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, the X-ray Earth occultation (XEO) of the Crab Nebula is investigated by using the Hard X-ray Modulation Telescope (Insight-HXMT). The pointing observation data on the 30th September, 2018 recorded by the Low Energy X-ray telescope (LE) of Insight-HXMT are selected and analyzed. The extinction lightcurves and spectra during the X-ray Earth occultation process are extracted. A forward model for the XEO lightcurve is established and the theoretical observational signal for lightcurve is predicted. The atmospheric density model is built with a scale factor to the commonly used MSIS ","authors_text":"Aoying Wang, Baoquan Li, Bingxian Luo, Daochun Yu, Haitao Li, Mingyu Ge, Wangchen Xue, Xiaobo Li, Yajun Zhu, Yaning Liu, YouLi Tuo","cross_cats":["astro-ph.HE","astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2022-04-21T15:31:44Z","title":"Measurement of the vertical atmospheric density profile from the X-ray Earth occultation of the Crab Nebula with Insight-HXMT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.09674","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":"sha256:3d4ccbf43d88a0f528d39a1cdadecb1859edce3c64c2b7f187c77aa6c9884ebc","target":"record","created_at":"2026-07-05T06:07:20Z","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":"c14fea348ad3f393e70731366311d645c5403dded27c1a5d9eb6f9a098ee3aa7","cross_cats_sorted":["astro-ph.HE","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.EP","submitted_at":"2022-04-21T15:31:44Z","title_canon_sha256":"83ecb0e15396d077a9dd9b79d7b11c9849d1e454575c41110d033f8615e223e6"},"schema_version":"1.0","source":{"id":"2204.09674","kind":"arxiv","version":1}},"canonical_sha256":"42b88ac316003199d3d2b7cb6b74b1a1e901e137b69f8e8e27f03e058057f2d8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"42b88ac316003199d3d2b7cb6b74b1a1e901e137b69f8e8e27f03e058057f2d8","first_computed_at":"2026-07-05T06:07:20.300256Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:07:20.300256Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rjKkJG2ivsVyQ3bqEqONF/30XbXbPJqfpgBg6jBL6yivIuQpSsW/rmZMpI2fMeo/H74BS9F4GNeeM+ygNQIsDw==","signature_status":"signed_v1","signed_at":"2026-07-05T06:07:20.300724Z","signed_message":"canonical_sha256_bytes"},"source_id":"2204.09674","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3d4ccbf43d88a0f528d39a1cdadecb1859edce3c64c2b7f187c77aa6c9884ebc","sha256:e42cf16b2d7310c18aa279930ec93e6509259a967aa95e1b07eb5ed13614892a"],"state_sha256":"39f62f4c96313f2e0f916c2903f2a7c26aa42a1f84c20d714381304ff57e09d6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y0jdYqOyqnJXGxBpsFxSQ/9b1jLHw/OWalVVCdKNUzmG8kqUhOwzuGjkT3kquueWqhiQRRWy60Aleia/VCo9Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-22T08:49:28.694737Z","bundle_sha256":"6922bbdf58dc01af8908b7f17c411280fdfccc3d7b2bacb90e423e4a5553998c"}}