{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:WWGV7YDKF5HXKJ3IWSKQBVHFF5","short_pith_number":"pith:WWGV7YDK","canonical_record":{"source":{"id":"0808.3377","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-08-25T16:11:15Z","cross_cats_sorted":[],"title_canon_sha256":"62138633556e5aa46d02df2400b4e4043318dc855bd9909cc3953997ea91f95a","abstract_canon_sha256":"67022dfa75ab3e36f582a1fd0a7b5f17f31d8a83c619315f81444229fb77f506"},"schema_version":"1.0"},"canonical_sha256":"b58d5fe06a2f4f752768b49500d4e52f5ac4d5d699c4cfae33827667b6854936","source":{"kind":"arxiv","id":"0808.3377","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0808.3377","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"arxiv_version","alias_value":"0808.3377v1","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0808.3377","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"pith_short_12","alias_value":"WWGV7YDKF5HX","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"pith_short_16","alias_value":"WWGV7YDKF5HXKJ3I","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"pith_short_8","alias_value":"WWGV7YDK","created_at":"2026-07-04T17:12:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:WWGV7YDKF5HXKJ3IWSKQBVHFF5","target":"record","payload":{"canonical_record":{"source":{"id":"0808.3377","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-08-25T16:11:15Z","cross_cats_sorted":[],"title_canon_sha256":"62138633556e5aa46d02df2400b4e4043318dc855bd9909cc3953997ea91f95a","abstract_canon_sha256":"67022dfa75ab3e36f582a1fd0a7b5f17f31d8a83c619315f81444229fb77f506"},"schema_version":"1.0"},"canonical_sha256":"b58d5fe06a2f4f752768b49500d4e52f5ac4d5d699c4cfae33827667b6854936","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:12:27.608022Z","signature_b64":"eWeY14gPy679A8pL7kkBrRTnYkTzxCRJs1ush9KY+n/sCpftv4ZILV9n6HR8iaPS6vY0qLSTthzdXGOOYrMTCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b58d5fe06a2f4f752768b49500d4e52f5ac4d5d699c4cfae33827667b6854936","last_reissued_at":"2026-07-04T17:12:27.607616Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:12:27.607616Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0808.3377","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":"2026-07-04T17:12:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NEyVwQDyXYtyDOlPkjJSeyf2mhCthxa5pL7Q0DFhYUXCP3gxucHJR1qd062HVT15FcOfxFb6DI1sl3QrCQ2HAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T19:17:57.697215Z"},"content_sha256":"9906c9a0c099ff17d6e8102505073713fb509f5775af25099d3dc5ac97f1342a","schema_version":"1.0","event_id":"sha256:9906c9a0c099ff17d6e8102505073713fb509f5775af25099d3dc5ac97f1342a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:WWGV7YDKF5HXKJ3IWSKQBVHFF5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cosmic X-ray background and Earth albedo Spectra with Swift/BAT","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. W. Strong, C. B. Markwardt, D. R. Willis, G. Hasinger, G. Kanbach, G. Sato, J. Greiner, J. Tueller, M. Ajello, N. Gehrels, R. Diehl","submitted_at":"2008-08-25T16:11:15Z","abstract_excerpt":"We use Swift/BAT Earth occultation data at different geomagnetic latitudes to derive a sensitive measurement of the Cosmic X-ray background (CXB) and of the Earth albedo emission in the 15--200 keV band. We compare our CXB spectrum with recent (INTEGRAL, BeppoSAX) and past results (HEAO-1) and find good agreement. Using an independent measurement of the CXB spectrum we are able to confirm our results. This study shows that the BAT CXB spectrum has a normalization ~8(+/-3)% larger than the HEAO-1 measurement. The BAT accurate Earth albedo spectrum can be used to predict the level of photon back"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0808.3377","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/0808.3377/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":"2026-07-04T17:12:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TRClt/iOexMKsWs9UufnigYZaL1QqUaQuHWChAnSIz5kG7IZijBkGQr2wpUk9nQFtQB6shLcHb8eNCq5qStlAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T19:17:57.697709Z"},"content_sha256":"111011c3884dbad1a07a57a8b4df93bca5af535c1c3b158c0f82ff7a44f1ff2d","schema_version":"1.0","event_id":"sha256:111011c3884dbad1a07a57a8b4df93bca5af535c1c3b158c0f82ff7a44f1ff2d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WWGV7YDKF5HXKJ3IWSKQBVHFF5/bundle.json","state_url":"https://pith.science/pith/WWGV7YDKF5HXKJ3IWSKQBVHFF5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WWGV7YDKF5HXKJ3IWSKQBVHFF5/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":"2026-08-18T19:17:57Z","links":{"resolver":"https://pith.science/pith/WWGV7YDKF5HXKJ3IWSKQBVHFF5","bundle":"https://pith.science/pith/WWGV7YDKF5HXKJ3IWSKQBVHFF5/bundle.json","state":"https://pith.science/pith/WWGV7YDKF5HXKJ3IWSKQBVHFF5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WWGV7YDKF5HXKJ3IWSKQBVHFF5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:WWGV7YDKF5HXKJ3IWSKQBVHFF5","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":"67022dfa75ab3e36f582a1fd0a7b5f17f31d8a83c619315f81444229fb77f506","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-08-25T16:11:15Z","title_canon_sha256":"62138633556e5aa46d02df2400b4e4043318dc855bd9909cc3953997ea91f95a"},"schema_version":"1.0","source":{"id":"0808.3377","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0808.3377","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"arxiv_version","alias_value":"0808.3377v1","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0808.3377","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"pith_short_12","alias_value":"WWGV7YDKF5HX","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"pith_short_16","alias_value":"WWGV7YDKF5HXKJ3I","created_at":"2026-07-04T17:12:27Z"},{"alias_kind":"pith_short_8","alias_value":"WWGV7YDK","created_at":"2026-07-04T17:12:27Z"}],"graph_snapshots":[{"event_id":"sha256:111011c3884dbad1a07a57a8b4df93bca5af535c1c3b158c0f82ff7a44f1ff2d","target":"graph","created_at":"2026-07-04T17:12:27Z","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/0808.3377/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We use Swift/BAT Earth occultation data at different geomagnetic latitudes to derive a sensitive measurement of the Cosmic X-ray background (CXB) and of the Earth albedo emission in the 15--200 keV band. We compare our CXB spectrum with recent (INTEGRAL, BeppoSAX) and past results (HEAO-1) and find good agreement. Using an independent measurement of the CXB spectrum we are able to confirm our results. This study shows that the BAT CXB spectrum has a normalization ~8(+/-3)% larger than the HEAO-1 measurement. The BAT accurate Earth albedo spectrum can be used to predict the level of photon back","authors_text":"A. W. Strong, C. B. Markwardt, D. R. Willis, G. Hasinger, G. Kanbach, G. Sato, J. Greiner, J. Tueller, M. Ajello, N. Gehrels, R. Diehl","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-08-25T16:11:15Z","title":"Cosmic X-ray background and Earth albedo Spectra with Swift/BAT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0808.3377","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":"sha256:9906c9a0c099ff17d6e8102505073713fb509f5775af25099d3dc5ac97f1342a","target":"record","created_at":"2026-07-04T17:12:27Z","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":"67022dfa75ab3e36f582a1fd0a7b5f17f31d8a83c619315f81444229fb77f506","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-08-25T16:11:15Z","title_canon_sha256":"62138633556e5aa46d02df2400b4e4043318dc855bd9909cc3953997ea91f95a"},"schema_version":"1.0","source":{"id":"0808.3377","kind":"arxiv","version":1}},"canonical_sha256":"b58d5fe06a2f4f752768b49500d4e52f5ac4d5d699c4cfae33827667b6854936","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b58d5fe06a2f4f752768b49500d4e52f5ac4d5d699c4cfae33827667b6854936","first_computed_at":"2026-07-04T17:12:27.607616Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:12:27.607616Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eWeY14gPy679A8pL7kkBrRTnYkTzxCRJs1ush9KY+n/sCpftv4ZILV9n6HR8iaPS6vY0qLSTthzdXGOOYrMTCg==","signature_status":"signed_v1","signed_at":"2026-07-04T17:12:27.608022Z","signed_message":"canonical_sha256_bytes"},"source_id":"0808.3377","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9906c9a0c099ff17d6e8102505073713fb509f5775af25099d3dc5ac97f1342a","sha256:111011c3884dbad1a07a57a8b4df93bca5af535c1c3b158c0f82ff7a44f1ff2d"],"state_sha256":"a5e4255a3e3783f1a2c6a1f7706ffae665a2884d9fb3ee88e4bad9a4ab7d852b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZFImSAZBzL+MlQw/Av+rSjOCQD4qPeXSUgVtExHKeE6Rp2U4m2dUehUr3q1yns1o6bVdRw3bUoaWCX2T6fVlAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T19:17:57.703879Z","bundle_sha256":"4b195667e21cdc860d99c27dd52714087efb7ec977dce69ffda11292c4cc5f73"}}