{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:EI3XQEYRJJGFN6VBZ7SEKSRAQI","short_pith_number":"pith:EI3XQEYR","canonical_record":{"source":{"id":"1510.03677","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-13T13:56:43Z","cross_cats_sorted":[],"title_canon_sha256":"15fa1eada2c9b87d6f82c063dcc77ded1b47bcdb2ad56b2291dcae7486d4eb9d","abstract_canon_sha256":"dfaa2e48ce86ce785673006ee660f158e3d2fd1da017579561fc1da921e35850"},"schema_version":"1.0"},"canonical_sha256":"22377813114a4c56faa1cfe4454a2082111faf21e19d213136debc782b2fa1c1","source":{"kind":"arxiv","id":"1510.03677","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.03677","created_at":"2026-05-18T01:27:56Z"},{"alias_kind":"arxiv_version","alias_value":"1510.03677v1","created_at":"2026-05-18T01:27:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.03677","created_at":"2026-05-18T01:27:56Z"},{"alias_kind":"pith_short_12","alias_value":"EI3XQEYRJJGF","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EI3XQEYRJJGFN6VB","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EI3XQEYR","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:EI3XQEYRJJGFN6VBZ7SEKSRAQI","target":"record","payload":{"canonical_record":{"source":{"id":"1510.03677","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-13T13:56:43Z","cross_cats_sorted":[],"title_canon_sha256":"15fa1eada2c9b87d6f82c063dcc77ded1b47bcdb2ad56b2291dcae7486d4eb9d","abstract_canon_sha256":"dfaa2e48ce86ce785673006ee660f158e3d2fd1da017579561fc1da921e35850"},"schema_version":"1.0"},"canonical_sha256":"22377813114a4c56faa1cfe4454a2082111faf21e19d213136debc782b2fa1c1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:27:56.618515Z","signature_b64":"XU5vatTg6TKTwecyWd1XVndavgjNUiWmIxgMtnnvem/HQSDNs8wvsNykCtdK1DShJ1OPkc31+UmMLm5jaWmEDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"22377813114a4c56faa1cfe4454a2082111faf21e19d213136debc782b2fa1c1","last_reissued_at":"2026-05-18T01:27:56.617710Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:27:56.617710Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.03677","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":"2026-05-18T01:27:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9EUNkey8TsYm8qfHO4UbJM8ak+97Y52cASIYp81qXF7DHnDyYSmaJaXFYAM7X/6UA1OD/B5e73XKTcwvUWLNCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T21:41:23.591948Z"},"content_sha256":"eb56da627b08a39312a27a9074e4052f03cf505e67d7ece3349245bf76f85c86","schema_version":"1.0","event_id":"sha256:eb56da627b08a39312a27a9074e4052f03cf505e67d7ece3349245bf76f85c86"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:EI3XQEYRJJGFN6VBZ7SEKSRAQI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First INTEGRAL observations of V404 Cygni during the 2015 outburst : spectral behavior in the 20 - 650 keV energy range","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Angela Bazzano, Elisabeth Jourdain, Jean-Pierre Roques, Lorenzo Natalucci, Mariateresa Fiocchi, Pietro Ubertini","submitted_at":"2015-10-13T13:56:43Z","abstract_excerpt":"In June 2015, the source V404 Cygni (= GS2023+38) underwent an extraordinary outburst. We present the results obtained during the first revolution dedicated to this target by the INTEGRAL mission, and focus on the spectral behavior in the hard X-ray domain, using both SPI and IBIS instruments. The source exhibits extreme variability, and reaches fluxes of several tens of Crab. However, the emission between 20 and 650 keV can be understood in terms of two main components, varying on all the observable timescales, similar to what is observed in the persistent black hole system Cyg X-1. The low e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.03677","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":"2026-05-18T01:27:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y/c7+I6OgbxujPcDfzdPoYzWNpTeEtbZQmMTbVLTUGC4p3hAzPGWo0ESxrLA/QC3wrpbMdkQkx8rsMvXMDPGCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T21:41:23.592618Z"},"content_sha256":"4d794fd47090b7b8cebf84037c315f3bd6d79e76329e8f42d5a9b5041f341c2e","schema_version":"1.0","event_id":"sha256:4d794fd47090b7b8cebf84037c315f3bd6d79e76329e8f42d5a9b5041f341c2e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EI3XQEYRJJGFN6VBZ7SEKSRAQI/bundle.json","state_url":"https://pith.science/pith/EI3XQEYRJJGFN6VBZ7SEKSRAQI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EI3XQEYRJJGFN6VBZ7SEKSRAQI/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":"2026-05-26T21:41:23Z","links":{"resolver":"https://pith.science/pith/EI3XQEYRJJGFN6VBZ7SEKSRAQI","bundle":"https://pith.science/pith/EI3XQEYRJJGFN6VBZ7SEKSRAQI/bundle.json","state":"https://pith.science/pith/EI3XQEYRJJGFN6VBZ7SEKSRAQI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EI3XQEYRJJGFN6VBZ7SEKSRAQI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:EI3XQEYRJJGFN6VBZ7SEKSRAQI","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":"dfaa2e48ce86ce785673006ee660f158e3d2fd1da017579561fc1da921e35850","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-13T13:56:43Z","title_canon_sha256":"15fa1eada2c9b87d6f82c063dcc77ded1b47bcdb2ad56b2291dcae7486d4eb9d"},"schema_version":"1.0","source":{"id":"1510.03677","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.03677","created_at":"2026-05-18T01:27:56Z"},{"alias_kind":"arxiv_version","alias_value":"1510.03677v1","created_at":"2026-05-18T01:27:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.03677","created_at":"2026-05-18T01:27:56Z"},{"alias_kind":"pith_short_12","alias_value":"EI3XQEYRJJGF","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EI3XQEYRJJGFN6VB","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EI3XQEYR","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:4d794fd47090b7b8cebf84037c315f3bd6d79e76329e8f42d5a9b5041f341c2e","target":"graph","created_at":"2026-05-18T01:27:56Z","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":"In June 2015, the source V404 Cygni (= GS2023+38) underwent an extraordinary outburst. We present the results obtained during the first revolution dedicated to this target by the INTEGRAL mission, and focus on the spectral behavior in the hard X-ray domain, using both SPI and IBIS instruments. The source exhibits extreme variability, and reaches fluxes of several tens of Crab. However, the emission between 20 and 650 keV can be understood in terms of two main components, varying on all the observable timescales, similar to what is observed in the persistent black hole system Cyg X-1. The low e","authors_text":"Angela Bazzano, Elisabeth Jourdain, Jean-Pierre Roques, Lorenzo Natalucci, Mariateresa Fiocchi, Pietro Ubertini","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-13T13:56:43Z","title":"First INTEGRAL observations of V404 Cygni during the 2015 outburst : spectral behavior in the 20 - 650 keV energy range"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.03677","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:eb56da627b08a39312a27a9074e4052f03cf505e67d7ece3349245bf76f85c86","target":"record","created_at":"2026-05-18T01:27:56Z","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":"dfaa2e48ce86ce785673006ee660f158e3d2fd1da017579561fc1da921e35850","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-13T13:56:43Z","title_canon_sha256":"15fa1eada2c9b87d6f82c063dcc77ded1b47bcdb2ad56b2291dcae7486d4eb9d"},"schema_version":"1.0","source":{"id":"1510.03677","kind":"arxiv","version":1}},"canonical_sha256":"22377813114a4c56faa1cfe4454a2082111faf21e19d213136debc782b2fa1c1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"22377813114a4c56faa1cfe4454a2082111faf21e19d213136debc782b2fa1c1","first_computed_at":"2026-05-18T01:27:56.617710Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:27:56.617710Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XU5vatTg6TKTwecyWd1XVndavgjNUiWmIxgMtnnvem/HQSDNs8wvsNykCtdK1DShJ1OPkc31+UmMLm5jaWmEDA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:27:56.618515Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.03677","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:eb56da627b08a39312a27a9074e4052f03cf505e67d7ece3349245bf76f85c86","sha256:4d794fd47090b7b8cebf84037c315f3bd6d79e76329e8f42d5a9b5041f341c2e"],"state_sha256":"adc9d34e0887e8443007cc944fb982ce2a98604ea7cc0b100621e244e4545c54"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/Dk8xpLZjqOskamlzetmo/mkrgcOMJQV0TemTISdQWCE3D+8CVS9frEXyoC/ejmqEwiMr3FJ8sHn/fzJSdxpAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T21:41:23.595639Z","bundle_sha256":"76438199d8752ab6f032db06436fa8649f3f85e1085fffb421d3a77aa4cd12d0"}}