{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:GJOPPQWZZGP5HCH34TDY3YD3SX","short_pith_number":"pith:GJOPPQWZ","canonical_record":{"source":{"id":"1510.03197","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-12T09:35:10Z","cross_cats_sorted":[],"title_canon_sha256":"25ed061eadf087f65ec1e667eba4b8bd1f73b7e57820a88f56b65c67c001dbea","abstract_canon_sha256":"b3963b165d698e36efca0b58ba643275a8f86e2650b13b2e314d4cf513dfa9e9"},"schema_version":"1.0"},"canonical_sha256":"325cf7c2d9c99fd388fbe4c78de07b95f9c9cf004163a7d031af19e56e13bf78","source":{"kind":"arxiv","id":"1510.03197","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.03197","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"arxiv_version","alias_value":"1510.03197v1","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.03197","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"pith_short_12","alias_value":"GJOPPQWZZGP5","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GJOPPQWZZGP5HCH3","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GJOPPQWZ","created_at":"2026-05-18T12:29:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:GJOPPQWZZGP5HCH34TDY3YD3SX","target":"record","payload":{"canonical_record":{"source":{"id":"1510.03197","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-12T09:35:10Z","cross_cats_sorted":[],"title_canon_sha256":"25ed061eadf087f65ec1e667eba4b8bd1f73b7e57820a88f56b65c67c001dbea","abstract_canon_sha256":"b3963b165d698e36efca0b58ba643275a8f86e2650b13b2e314d4cf513dfa9e9"},"schema_version":"1.0"},"canonical_sha256":"325cf7c2d9c99fd388fbe4c78de07b95f9c9cf004163a7d031af19e56e13bf78","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:49:19.372628Z","signature_b64":"JonJGN4Yk6HwxCbbNp/pv1psCluteCQPWmIHA2vPyUSnJomAVpy3lL4yo80JXvfJwAd5QK59vq4Md3Aiv7UiCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"325cf7c2d9c99fd388fbe4c78de07b95f9c9cf004163a7d031af19e56e13bf78","last_reissued_at":"2026-05-18T00:49:19.372257Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:49:19.372257Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.03197","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":"2026-05-18T00:49:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8xANGrJ/imUXymfuej+Aipg1jWyWQbUzmTfquH6rmAHcAbLNY9zCFrYzSYJZx9p1WVyo0gIKDfMuuCOWc8aWCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T04:15:58.190403Z"},"content_sha256":"fbdc89c2e3de55faa8640ced89b762c0c7fcde15341d7348330ce007e75d1d7b","schema_version":"1.0","event_id":"sha256:fbdc89c2e3de55faa8640ced89b762c0c7fcde15341d7348330ce007e75d1d7b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:GJOPPQWZZGP5HCH34TDY3YD3SX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"X-ray spectral evolution of V404 Cygni in the initial phase of the 2015 outburst","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":"2015-10-12T09:35:10Z","abstract_excerpt":"The black hole binary GS 2023+338 exhibited an unprecedently bright outburst on June 2015. Since June 17th, the high energy instruments on board INTEGRAL detected an extremely variable emission during both bright and low luminosity phases, with dramatic variations of the hardness ratio on time scales of ~seconds. The analysis of the IBIS and SPI data reveals the presence of hard spectra in the brightest phases, compatible with thermal Comptonization with temperature kTe ~ 40 keV. The seed photons temperature is best fit by kT0 ~ 7 keV, that is too high to be compatible with blackbody emission "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.03197","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":"2026-05-18T00:49:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eWMHVjRQNa9z3+foTsnkHoeaQChxrlIoS1MTYine2BnMPzqI9EqLFRi2nzGFWVqOnE1VUsSvEGgaCUYOatceDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T04:15:58.190966Z"},"content_sha256":"7a1d7e497da1da61a0fd32fdcdb3a96a7aa3da699dccb17045360cb796d2a585","schema_version":"1.0","event_id":"sha256:7a1d7e497da1da61a0fd32fdcdb3a96a7aa3da699dccb17045360cb796d2a585"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GJOPPQWZZGP5HCH34TDY3YD3SX/bundle.json","state_url":"https://pith.science/pith/GJOPPQWZZGP5HCH34TDY3YD3SX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GJOPPQWZZGP5HCH34TDY3YD3SX/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":"2026-06-05T04:15:58Z","links":{"resolver":"https://pith.science/pith/GJOPPQWZZGP5HCH34TDY3YD3SX","bundle":"https://pith.science/pith/GJOPPQWZZGP5HCH34TDY3YD3SX/bundle.json","state":"https://pith.science/pith/GJOPPQWZZGP5HCH34TDY3YD3SX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GJOPPQWZZGP5HCH34TDY3YD3SX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:GJOPPQWZZGP5HCH34TDY3YD3SX","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":"b3963b165d698e36efca0b58ba643275a8f86e2650b13b2e314d4cf513dfa9e9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-12T09:35:10Z","title_canon_sha256":"25ed061eadf087f65ec1e667eba4b8bd1f73b7e57820a88f56b65c67c001dbea"},"schema_version":"1.0","source":{"id":"1510.03197","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.03197","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"arxiv_version","alias_value":"1510.03197v1","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.03197","created_at":"2026-05-18T00:49:19Z"},{"alias_kind":"pith_short_12","alias_value":"GJOPPQWZZGP5","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_16","alias_value":"GJOPPQWZZGP5HCH3","created_at":"2026-05-18T12:29:22Z"},{"alias_kind":"pith_short_8","alias_value":"GJOPPQWZ","created_at":"2026-05-18T12:29:22Z"}],"graph_snapshots":[{"event_id":"sha256:7a1d7e497da1da61a0fd32fdcdb3a96a7aa3da699dccb17045360cb796d2a585","target":"graph","created_at":"2026-05-18T00:49:19Z","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":"The black hole binary GS 2023+338 exhibited an unprecedently bright outburst on June 2015. Since June 17th, the high energy instruments on board INTEGRAL detected an extremely variable emission during both bright and low luminosity phases, with dramatic variations of the hardness ratio on time scales of ~seconds. The analysis of the IBIS and SPI data reveals the presence of hard spectra in the brightest phases, compatible with thermal Comptonization with temperature kTe ~ 40 keV. The seed photons temperature is best fit by kT0 ~ 7 keV, that is too high to be compatible with blackbody emission ","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":"2015-10-12T09:35:10Z","title":"X-ray spectral evolution of V404 Cygni in the initial phase of the 2015 outburst"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.03197","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:fbdc89c2e3de55faa8640ced89b762c0c7fcde15341d7348330ce007e75d1d7b","target":"record","created_at":"2026-05-18T00:49:19Z","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":"b3963b165d698e36efca0b58ba643275a8f86e2650b13b2e314d4cf513dfa9e9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-10-12T09:35:10Z","title_canon_sha256":"25ed061eadf087f65ec1e667eba4b8bd1f73b7e57820a88f56b65c67c001dbea"},"schema_version":"1.0","source":{"id":"1510.03197","kind":"arxiv","version":1}},"canonical_sha256":"325cf7c2d9c99fd388fbe4c78de07b95f9c9cf004163a7d031af19e56e13bf78","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"325cf7c2d9c99fd388fbe4c78de07b95f9c9cf004163a7d031af19e56e13bf78","first_computed_at":"2026-05-18T00:49:19.372257Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:49:19.372257Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JonJGN4Yk6HwxCbbNp/pv1psCluteCQPWmIHA2vPyUSnJomAVpy3lL4yo80JXvfJwAd5QK59vq4Md3Aiv7UiCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:49:19.372628Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.03197","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fbdc89c2e3de55faa8640ced89b762c0c7fcde15341d7348330ce007e75d1d7b","sha256:7a1d7e497da1da61a0fd32fdcdb3a96a7aa3da699dccb17045360cb796d2a585"],"state_sha256":"7da4f1aaa08486d640301f56717315567e9e26b7ecfc248d83c9a25a323ffdee"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bowmrTZpbtztu1850Wouiyd6FFeVUkb8GVygMPI7OgBFucWbQjtTU83MDzGPrFj+oSyTYd2mIQ99RUUE+s+bBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T04:15:58.194353Z","bundle_sha256":"fc89bf62b77dbbba6cc2f7f4db46599ad4580b0199fc77717c43b11bf0d1134b"}}