{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:R35KDKQYWOYAWUHCOBP5BAVX5M","short_pith_number":"pith:R35KDKQY","canonical_record":{"source":{"id":"2208.01732","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-08-02T20:46:35Z","cross_cats_sorted":[],"title_canon_sha256":"984d37cd5b0bba9ccf012a40cfca7fd3dad8ab424d588d830bc7571ceda3ba1f","abstract_canon_sha256":"92ddc07754994bfc9759b3442f5c279500237236d6f3ec707326c1a20189675b"},"schema_version":"1.0"},"canonical_sha256":"8efaa1aa18b3b00b50e2705fd082b7eb2e313f5f5d56b12af2ebaaf69bf18ac9","source":{"kind":"arxiv","id":"2208.01732","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.01732","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"arxiv_version","alias_value":"2208.01732v1","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.01732","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"pith_short_12","alias_value":"R35KDKQYWOYA","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"pith_short_16","alias_value":"R35KDKQYWOYAWUHC","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"pith_short_8","alias_value":"R35KDKQY","created_at":"2026-07-05T04:49:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:R35KDKQYWOYAWUHCOBP5BAVX5M","target":"record","payload":{"canonical_record":{"source":{"id":"2208.01732","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-08-02T20:46:35Z","cross_cats_sorted":[],"title_canon_sha256":"984d37cd5b0bba9ccf012a40cfca7fd3dad8ab424d588d830bc7571ceda3ba1f","abstract_canon_sha256":"92ddc07754994bfc9759b3442f5c279500237236d6f3ec707326c1a20189675b"},"schema_version":"1.0"},"canonical_sha256":"8efaa1aa18b3b00b50e2705fd082b7eb2e313f5f5d56b12af2ebaaf69bf18ac9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:49:02.802378Z","signature_b64":"Kfbnlg4T4HEe6FwadVVkqzqx5KnTAsW5OvPVpTUQBjRv8Wk6sGxuhxPNOdhQEwASpSXU3wNbIP61mxnsfHi2CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8efaa1aa18b3b00b50e2705fd082b7eb2e313f5f5d56b12af2ebaaf69bf18ac9","last_reissued_at":"2026-07-05T04:49:02.801951Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:49:02.801951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2208.01732","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":"2026-07-05T04:49:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lpLqHiEKga/A0vSlx5n/0wzHuF699vQhm0guby1p5qXs08ryY5zE6/9e9cUhDsVBfieYYpMAr2Kmj/YRcr3jDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T21:05:59.247465Z"},"content_sha256":"476961964422656e5846c849d6fad0c2e9685b8b9535d9326c37a0a4ace03756","schema_version":"1.0","event_id":"sha256:476961964422656e5846c849d6fad0c2e9685b8b9535d9326c37a0a4ace03756"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:R35KDKQYWOYAWUHCOBP5BAVX5M","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"High resolution X-ray spectroscopy of V4641 Sgr during its 2020 outburst","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Bahramian, A. W. Shaw, C. O. Heinke, D. J. K. Buisson, G. R. Sivakoff, J. A. Tomsick, J. M. Miller, P. Gandhi, R. M. Plotkin, V. Grinberg","submitted_at":"2022-08-02T20:46:35Z","abstract_excerpt":"We observed the Galactic black hole X-ray binary V4641 Sgr with the high resolution transmission gratings on Chandra during the source's 2020 outburst. Over two epochs of Chandra gratings observations, we see numerous highly ionized metal lines, superimposed on a hot, disc-dominated X-ray continuum. The measured inner disc temperatures and luminosities imply an unfeasibly small inner disc radius, such that we suggest that the central engine of V4641 Sgr is obscured, and we are viewing scattered X-rays. We find that the emission lines in the Chandra spectra cannot be constrained by a single pho"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.01732","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/2208.01732/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":"2026-07-05T04:49:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"355le+wu62GiM3/Mdjeq0rDHUUBPBuXLjd/iprnQMjYg+P0N+yMAnlMRv5BT2KXN93GPeZW2sIbT/p7xz7HVCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T21:05:59.247963Z"},"content_sha256":"d406032b6fe9dc4dad192d165db6fc785ae7983e5b04036b3cad43ef4fddcac4","schema_version":"1.0","event_id":"sha256:d406032b6fe9dc4dad192d165db6fc785ae7983e5b04036b3cad43ef4fddcac4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R35KDKQYWOYAWUHCOBP5BAVX5M/bundle.json","state_url":"https://pith.science/pith/R35KDKQYWOYAWUHCOBP5BAVX5M/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R35KDKQYWOYAWUHCOBP5BAVX5M/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":"2026-08-06T21:05:59Z","links":{"resolver":"https://pith.science/pith/R35KDKQYWOYAWUHCOBP5BAVX5M","bundle":"https://pith.science/pith/R35KDKQYWOYAWUHCOBP5BAVX5M/bundle.json","state":"https://pith.science/pith/R35KDKQYWOYAWUHCOBP5BAVX5M/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R35KDKQYWOYAWUHCOBP5BAVX5M/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:R35KDKQYWOYAWUHCOBP5BAVX5M","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":"92ddc07754994bfc9759b3442f5c279500237236d6f3ec707326c1a20189675b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-08-02T20:46:35Z","title_canon_sha256":"984d37cd5b0bba9ccf012a40cfca7fd3dad8ab424d588d830bc7571ceda3ba1f"},"schema_version":"1.0","source":{"id":"2208.01732","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2208.01732","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"arxiv_version","alias_value":"2208.01732v1","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2208.01732","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"pith_short_12","alias_value":"R35KDKQYWOYA","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"pith_short_16","alias_value":"R35KDKQYWOYAWUHC","created_at":"2026-07-05T04:49:02Z"},{"alias_kind":"pith_short_8","alias_value":"R35KDKQY","created_at":"2026-07-05T04:49:02Z"}],"graph_snapshots":[{"event_id":"sha256:d406032b6fe9dc4dad192d165db6fc785ae7983e5b04036b3cad43ef4fddcac4","target":"graph","created_at":"2026-07-05T04:49:02Z","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/2208.01732/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We observed the Galactic black hole X-ray binary V4641 Sgr with the high resolution transmission gratings on Chandra during the source's 2020 outburst. Over two epochs of Chandra gratings observations, we see numerous highly ionized metal lines, superimposed on a hot, disc-dominated X-ray continuum. The measured inner disc temperatures and luminosities imply an unfeasibly small inner disc radius, such that we suggest that the central engine of V4641 Sgr is obscured, and we are viewing scattered X-rays. We find that the emission lines in the Chandra spectra cannot be constrained by a single pho","authors_text":"A. Bahramian, A. W. Shaw, C. O. Heinke, D. J. K. Buisson, G. R. Sivakoff, J. A. Tomsick, J. M. Miller, P. Gandhi, R. M. Plotkin, V. Grinberg","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-08-02T20:46:35Z","title":"High resolution X-ray spectroscopy of V4641 Sgr during its 2020 outburst"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2208.01732","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":"sha256:476961964422656e5846c849d6fad0c2e9685b8b9535d9326c37a0a4ace03756","target":"record","created_at":"2026-07-05T04:49:02Z","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":"92ddc07754994bfc9759b3442f5c279500237236d6f3ec707326c1a20189675b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-08-02T20:46:35Z","title_canon_sha256":"984d37cd5b0bba9ccf012a40cfca7fd3dad8ab424d588d830bc7571ceda3ba1f"},"schema_version":"1.0","source":{"id":"2208.01732","kind":"arxiv","version":1}},"canonical_sha256":"8efaa1aa18b3b00b50e2705fd082b7eb2e313f5f5d56b12af2ebaaf69bf18ac9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8efaa1aa18b3b00b50e2705fd082b7eb2e313f5f5d56b12af2ebaaf69bf18ac9","first_computed_at":"2026-07-05T04:49:02.801951Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:49:02.801951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Kfbnlg4T4HEe6FwadVVkqzqx5KnTAsW5OvPVpTUQBjRv8Wk6sGxuhxPNOdhQEwASpSXU3wNbIP61mxnsfHi2CA==","signature_status":"signed_v1","signed_at":"2026-07-05T04:49:02.802378Z","signed_message":"canonical_sha256_bytes"},"source_id":"2208.01732","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:476961964422656e5846c849d6fad0c2e9685b8b9535d9326c37a0a4ace03756","sha256:d406032b6fe9dc4dad192d165db6fc785ae7983e5b04036b3cad43ef4fddcac4"],"state_sha256":"e1e36218ff4983c3e55eed08fce7d64f2de3048636e0341d3a0e16fd3f58f767"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vcxW4bF/u5T5IWnBHYTLZNGJIaSLX5oSQVYAP+ZDra7RnrCNOLpGM++7+mOoubfEulHszy702seap9mxqo6QDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T21:05:59.251482Z","bundle_sha256":"4733d6f9d0c9d6e05f3179cb86d7ce086101952d29e0e26260082514c11e8f00"}}