{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:7Q6WG5KUKUE4IKCTV7KUCMVYME","short_pith_number":"pith:7Q6WG5KU","canonical_record":{"source":{"id":"1308.1251","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-08-06T12:13:02Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"bbf46378d4c9e43870c0bc1cb2a19b4cd3cc64208db4b21367fbbef49f58aa0f","abstract_canon_sha256":"44f1f70ff9b88ac71d07ff1d2f6b2f261ce703c721607ea12c4dd772d023e6bb"},"schema_version":"1.0"},"canonical_sha256":"fc3d6375545509c42853afd54132b86126618aeeac3642e5ad0369bd42d5a1ae","source":{"kind":"arxiv","id":"1308.1251","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.1251","created_at":"2026-05-18T01:48:23Z"},{"alias_kind":"arxiv_version","alias_value":"1308.1251v1","created_at":"2026-05-18T01:48:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.1251","created_at":"2026-05-18T01:48:23Z"},{"alias_kind":"pith_short_12","alias_value":"7Q6WG5KUKUE4","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"7Q6WG5KUKUE4IKCT","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"7Q6WG5KU","created_at":"2026-05-18T12:27:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:7Q6WG5KUKUE4IKCTV7KUCMVYME","target":"record","payload":{"canonical_record":{"source":{"id":"1308.1251","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-08-06T12:13:02Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"bbf46378d4c9e43870c0bc1cb2a19b4cd3cc64208db4b21367fbbef49f58aa0f","abstract_canon_sha256":"44f1f70ff9b88ac71d07ff1d2f6b2f261ce703c721607ea12c4dd772d023e6bb"},"schema_version":"1.0"},"canonical_sha256":"fc3d6375545509c42853afd54132b86126618aeeac3642e5ad0369bd42d5a1ae","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:23.280100Z","signature_b64":"9pvHz1BQiolWunpldG9xEy4heOBaWswcqYsMNLxQ8GFAibf+6O5QyCqxIGyFGPHY6P7gLH8RAxRGLsoSiT6kDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fc3d6375545509c42853afd54132b86126618aeeac3642e5ad0369bd42d5a1ae","last_reissued_at":"2026-05-18T01:48:23.279226Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:23.279226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.1251","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":"2026-05-18T01:48:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KmQLo7GaZLLL2jGYzpEYwqsfkTe+oIAhHR3qAsLjDm7ywRQX6mjdbSsDOGEmMzX4tUBIEr6pLJxGPi+yFHpbAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T08:52:34.249918Z"},"content_sha256":"4495c2da6e834d15bf11e936d909c5c337b2bb138fbc770c2a2a78d91735e8c9","schema_version":"1.0","event_id":"sha256:4495c2da6e834d15bf11e936d909c5c337b2bb138fbc770c2a2a78d91735e8c9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:7Q6WG5KUKUE4IKCTV7KUCMVYME","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards a dynamical mass of the ultraluminous X-ray source NGC 5408 X-1","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"D. Cseh, E. Koerding, F. Grise, H. Falcke, P. Groot, P. Kaaret, S. Corbel, S. Scaringi","submitted_at":"2013-08-06T12:13:02Z","abstract_excerpt":"We obtained multi-epoch Very Large Telescope (VLT) optical spectroscopic data in 2011 and 2012 on the ultraluminous X-ray source (ULX) NGC 5408 X-1. We confirm that the HeII\\lambda4686 line has a broad component with an average FWHM of v=780\\pm64 km/s with a variation of ~13% during observations spanning over 4 years, and is consistent with the origin in the accretion disc. The deepest optical spectrum does not reveal any absorption line from a donor star. Our aim was to measure the radial velocity curve and estimate the parameters of the binary system. We find an upper limit on the semi-ampli"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.1251","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":"2026-05-18T01:48:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BCCu6yUN1HNr/iKHItqOEWorecB7dZMNvINwG5fBe7EmPUmZr1rHwyAP9dEJxOs4UGMOkIZOutpj9uouka+lDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T08:52:34.250552Z"},"content_sha256":"8fda901e044c40a9159f2dc0923e88f5ddf5b57c2841d4ca0c51d4d76c136430","schema_version":"1.0","event_id":"sha256:8fda901e044c40a9159f2dc0923e88f5ddf5b57c2841d4ca0c51d4d76c136430"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7Q6WG5KUKUE4IKCTV7KUCMVYME/bundle.json","state_url":"https://pith.science/pith/7Q6WG5KUKUE4IKCTV7KUCMVYME/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7Q6WG5KUKUE4IKCTV7KUCMVYME/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":"2026-06-05T08:52:34Z","links":{"resolver":"https://pith.science/pith/7Q6WG5KUKUE4IKCTV7KUCMVYME","bundle":"https://pith.science/pith/7Q6WG5KUKUE4IKCTV7KUCMVYME/bundle.json","state":"https://pith.science/pith/7Q6WG5KUKUE4IKCTV7KUCMVYME/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7Q6WG5KUKUE4IKCTV7KUCMVYME/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:7Q6WG5KUKUE4IKCTV7KUCMVYME","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":"44f1f70ff9b88ac71d07ff1d2f6b2f261ce703c721607ea12c4dd772d023e6bb","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-08-06T12:13:02Z","title_canon_sha256":"bbf46378d4c9e43870c0bc1cb2a19b4cd3cc64208db4b21367fbbef49f58aa0f"},"schema_version":"1.0","source":{"id":"1308.1251","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.1251","created_at":"2026-05-18T01:48:23Z"},{"alias_kind":"arxiv_version","alias_value":"1308.1251v1","created_at":"2026-05-18T01:48:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.1251","created_at":"2026-05-18T01:48:23Z"},{"alias_kind":"pith_short_12","alias_value":"7Q6WG5KUKUE4","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"7Q6WG5KUKUE4IKCT","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"7Q6WG5KU","created_at":"2026-05-18T12:27:36Z"}],"graph_snapshots":[{"event_id":"sha256:8fda901e044c40a9159f2dc0923e88f5ddf5b57c2841d4ca0c51d4d76c136430","target":"graph","created_at":"2026-05-18T01:48:23Z","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":"We obtained multi-epoch Very Large Telescope (VLT) optical spectroscopic data in 2011 and 2012 on the ultraluminous X-ray source (ULX) NGC 5408 X-1. We confirm that the HeII\\lambda4686 line has a broad component with an average FWHM of v=780\\pm64 km/s with a variation of ~13% during observations spanning over 4 years, and is consistent with the origin in the accretion disc. The deepest optical spectrum does not reveal any absorption line from a donor star. Our aim was to measure the radial velocity curve and estimate the parameters of the binary system. We find an upper limit on the semi-ampli","authors_text":"D. Cseh, E. Koerding, F. Grise, H. Falcke, P. Groot, P. Kaaret, S. Corbel, S. Scaringi","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-08-06T12:13:02Z","title":"Towards a dynamical mass of the ultraluminous X-ray source NGC 5408 X-1"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.1251","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":"sha256:4495c2da6e834d15bf11e936d909c5c337b2bb138fbc770c2a2a78d91735e8c9","target":"record","created_at":"2026-05-18T01:48:23Z","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":"44f1f70ff9b88ac71d07ff1d2f6b2f261ce703c721607ea12c4dd772d023e6bb","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-08-06T12:13:02Z","title_canon_sha256":"bbf46378d4c9e43870c0bc1cb2a19b4cd3cc64208db4b21367fbbef49f58aa0f"},"schema_version":"1.0","source":{"id":"1308.1251","kind":"arxiv","version":1}},"canonical_sha256":"fc3d6375545509c42853afd54132b86126618aeeac3642e5ad0369bd42d5a1ae","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fc3d6375545509c42853afd54132b86126618aeeac3642e5ad0369bd42d5a1ae","first_computed_at":"2026-05-18T01:48:23.279226Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:23.279226Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9pvHz1BQiolWunpldG9xEy4heOBaWswcqYsMNLxQ8GFAibf+6O5QyCqxIGyFGPHY6P7gLH8RAxRGLsoSiT6kDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:23.280100Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.1251","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4495c2da6e834d15bf11e936d909c5c337b2bb138fbc770c2a2a78d91735e8c9","sha256:8fda901e044c40a9159f2dc0923e88f5ddf5b57c2841d4ca0c51d4d76c136430"],"state_sha256":"05c072c3c5635e9ae072bac1e8fe3c266465f2baadddb08b985ad062f0b76af4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5CixXNZe3420HfC4dNSDNx8hpT2nRCUTXCaUeTZ5VtjkpXVXQSEQvLimhcwRqe6agIIoMADdL3nOyDGlkvouDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T08:52:34.253648Z","bundle_sha256":"e7b4a6e3909b201777fe1639df3aa835020f76c2f3ff11dd834e756bcc3488ca"}}