{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:7MDCNE7XDLT7JR5DIIN5G3ODFW","short_pith_number":"pith:7MDCNE7X","canonical_record":{"source":{"id":"1809.03237","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-09-10T11:18:09Z","cross_cats_sorted":[],"title_canon_sha256":"fcf00ef129375a68840654103f1b637483b710b7e4ab25de5b5887d4bd642094","abstract_canon_sha256":"9bce217965bbfbce45a489a350f64387a4247305ceb7c77bdd42bcc1603f9a2b"},"schema_version":"1.0"},"canonical_sha256":"fb062693f71ae7f4c7a3421bd36dc32da49440d8761a47321102163c805329d7","source":{"kind":"arxiv","id":"1809.03237","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.03237","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"arxiv_version","alias_value":"1809.03237v2","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.03237","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"pith_short_12","alias_value":"7MDCNE7XDLT7","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"pith_short_16","alias_value":"7MDCNE7XDLT7JR5D","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"pith_short_8","alias_value":"7MDCNE7X","created_at":"2026-07-04T23:53:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:7MDCNE7XDLT7JR5DIIN5G3ODFW","target":"record","payload":{"canonical_record":{"source":{"id":"1809.03237","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-09-10T11:18:09Z","cross_cats_sorted":[],"title_canon_sha256":"fcf00ef129375a68840654103f1b637483b710b7e4ab25de5b5887d4bd642094","abstract_canon_sha256":"9bce217965bbfbce45a489a350f64387a4247305ceb7c77bdd42bcc1603f9a2b"},"schema_version":"1.0"},"canonical_sha256":"fb062693f71ae7f4c7a3421bd36dc32da49440d8761a47321102163c805329d7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:53:10.042122Z","signature_b64":"TJ/r2U1+gbYbVQ3WKTzH2OGCYs85yFw61T7WGrMXqDYlO+8eBymo39moq3bJF2GdEURXgYjXPOtGt8LEvbEADw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fb062693f71ae7f4c7a3421bd36dc32da49440d8761a47321102163c805329d7","last_reissued_at":"2026-07-04T23:53:10.041569Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:53:10.041569Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.03237","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":"2026-07-04T23:53:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ycmnXOw3C3jsDkHM86sJoXLY14BVfwogdi+hql9KDsPnpwdry6hwj+G+KHwSWEPURtBsq+jpEaJBuJJdK8d8Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-19T11:31:15.294724Z"},"content_sha256":"dd0942db079b5c8a6fbb4aa2efca619c91c3c7a9fe50cebc8bccf06caad6054a","schema_version":"1.0","event_id":"sha256:dd0942db079b5c8a6fbb4aa2efca619c91c3c7a9fe50cebc8bccf06caad6054a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:7MDCNE7XDLT7JR5DIIN5G3ODFW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Swift UVOT observations of the 2015 outburst of V404 Cygni","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. A. Breeveld, A. J. Castro-Tirado, A. P. Beardmore, C. Knigge, D. Altamirano, D. M. Russell, D. Steeghs, M. De Pasquale, M. J. Page, N. P. M. Kuin, P. Gandhi, S. Motta, S. R. Oates","submitted_at":"2018-09-10T11:18:09Z","abstract_excerpt":"The black-hole binary, V404 Cygni, went into outburst in June 2015, after 26 years of X-ray quiescence. We observed the outburst with the Neil Gehrels Swift observatory. We present optical/UV observations taken with the Swift Ultra-violet Optical Telescope, and compare them with the X-ray observations obtained with the Swift X-ray Telescope. We find that dust extinction affecting the optical/UV, does not correlate with absorption due to neutral hydrogen that affects the X-ray emission. We suggest there is a small inhomogeneous high density absorber containing a negligible amount of dust, close"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.03237","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1809.03237/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":"2026-07-04T23:53:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ezTSIZ0s+A7C5R1kmQkspZyc6XucgSLjXDykglDFHf/QTX4jnhUB4s1CKPEn+Y37JBR87PqvbpCNRPLfs1xpAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-19T11:31:15.295092Z"},"content_sha256":"aaf069907d4c9cb1a85630a9c43d8d65fa692a70884d48803a73a51308c5f56f","schema_version":"1.0","event_id":"sha256:aaf069907d4c9cb1a85630a9c43d8d65fa692a70884d48803a73a51308c5f56f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7MDCNE7XDLT7JR5DIIN5G3ODFW/bundle.json","state_url":"https://pith.science/pith/7MDCNE7XDLT7JR5DIIN5G3ODFW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7MDCNE7XDLT7JR5DIIN5G3ODFW/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":"2026-07-19T11:31:15Z","links":{"resolver":"https://pith.science/pith/7MDCNE7XDLT7JR5DIIN5G3ODFW","bundle":"https://pith.science/pith/7MDCNE7XDLT7JR5DIIN5G3ODFW/bundle.json","state":"https://pith.science/pith/7MDCNE7XDLT7JR5DIIN5G3ODFW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7MDCNE7XDLT7JR5DIIN5G3ODFW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:7MDCNE7XDLT7JR5DIIN5G3ODFW","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":"9bce217965bbfbce45a489a350f64387a4247305ceb7c77bdd42bcc1603f9a2b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-09-10T11:18:09Z","title_canon_sha256":"fcf00ef129375a68840654103f1b637483b710b7e4ab25de5b5887d4bd642094"},"schema_version":"1.0","source":{"id":"1809.03237","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.03237","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"arxiv_version","alias_value":"1809.03237v2","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.03237","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"pith_short_12","alias_value":"7MDCNE7XDLT7","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"pith_short_16","alias_value":"7MDCNE7XDLT7JR5D","created_at":"2026-07-04T23:53:10Z"},{"alias_kind":"pith_short_8","alias_value":"7MDCNE7X","created_at":"2026-07-04T23:53:10Z"}],"graph_snapshots":[{"event_id":"sha256:aaf069907d4c9cb1a85630a9c43d8d65fa692a70884d48803a73a51308c5f56f","target":"graph","created_at":"2026-07-04T23:53:10Z","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/1809.03237/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The black-hole binary, V404 Cygni, went into outburst in June 2015, after 26 years of X-ray quiescence. We observed the outburst with the Neil Gehrels Swift observatory. We present optical/UV observations taken with the Swift Ultra-violet Optical Telescope, and compare them with the X-ray observations obtained with the Swift X-ray Telescope. We find that dust extinction affecting the optical/UV, does not correlate with absorption due to neutral hydrogen that affects the X-ray emission. We suggest there is a small inhomogeneous high density absorber containing a negligible amount of dust, close","authors_text":"A. A. Breeveld, A. J. Castro-Tirado, A. P. Beardmore, C. Knigge, D. Altamirano, D. M. Russell, D. Steeghs, M. De Pasquale, M. J. Page, N. P. M. Kuin, P. Gandhi, S. Motta, S. R. Oates","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-09-10T11:18:09Z","title":"Swift UVOT observations of the 2015 outburst of V404 Cygni"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.03237","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:dd0942db079b5c8a6fbb4aa2efca619c91c3c7a9fe50cebc8bccf06caad6054a","target":"record","created_at":"2026-07-04T23:53:10Z","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":"9bce217965bbfbce45a489a350f64387a4247305ceb7c77bdd42bcc1603f9a2b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-09-10T11:18:09Z","title_canon_sha256":"fcf00ef129375a68840654103f1b637483b710b7e4ab25de5b5887d4bd642094"},"schema_version":"1.0","source":{"id":"1809.03237","kind":"arxiv","version":2}},"canonical_sha256":"fb062693f71ae7f4c7a3421bd36dc32da49440d8761a47321102163c805329d7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fb062693f71ae7f4c7a3421bd36dc32da49440d8761a47321102163c805329d7","first_computed_at":"2026-07-04T23:53:10.041569Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:53:10.041569Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TJ/r2U1+gbYbVQ3WKTzH2OGCYs85yFw61T7WGrMXqDYlO+8eBymo39moq3bJF2GdEURXgYjXPOtGt8LEvbEADw==","signature_status":"signed_v1","signed_at":"2026-07-04T23:53:10.042122Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.03237","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dd0942db079b5c8a6fbb4aa2efca619c91c3c7a9fe50cebc8bccf06caad6054a","sha256:aaf069907d4c9cb1a85630a9c43d8d65fa692a70884d48803a73a51308c5f56f"],"state_sha256":"67bb235b5b8eeeaec9aaefca6cdc9851dfd3f9fc2471e1bd1aa9db81ce4fe1be"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mD6bHE4dngrede+BBHvZUSl6yfcX5i9Ote1dY6hjgvpaX86umGKJNUrE1hCyWTsG7X84zpNMedXz8vPCDP7QDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-19T11:31:15.297204Z","bundle_sha256":"7acee0684f1a5751b6be75ec60480a93f0e6734c158f72de15666a7fbe19f528"}}