{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:IGDFHP3SUU52PPT6KMO53F6UYI","short_pith_number":"pith:IGDFHP3S","canonical_record":{"source":{"id":"1607.02881","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-07-11T10:02:09Z","cross_cats_sorted":[],"title_canon_sha256":"16c0f9974f6bfbc805829513d59290652a3b3552b5da9c66af89242dc8a398e7","abstract_canon_sha256":"00878c4d285998e151de70f6eb44ea91b1216f990670d65fb93feb9c9e9a7b3a"},"schema_version":"1.0"},"canonical_sha256":"418653bf72a53ba7be7e531ddd97d4c22150247f23b5abef605a5f7efd13390d","source":{"kind":"arxiv","id":"1607.02881","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.02881","created_at":"2026-05-18T01:04:08Z"},{"alias_kind":"arxiv_version","alias_value":"1607.02881v2","created_at":"2026-05-18T01:04:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.02881","created_at":"2026-05-18T01:04:08Z"},{"alias_kind":"pith_short_12","alias_value":"IGDFHP3SUU52","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"IGDFHP3SUU52PPT6","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"IGDFHP3S","created_at":"2026-05-18T12:30:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:IGDFHP3SUU52PPT6KMO53F6UYI","target":"record","payload":{"canonical_record":{"source":{"id":"1607.02881","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-07-11T10:02:09Z","cross_cats_sorted":[],"title_canon_sha256":"16c0f9974f6bfbc805829513d59290652a3b3552b5da9c66af89242dc8a398e7","abstract_canon_sha256":"00878c4d285998e151de70f6eb44ea91b1216f990670d65fb93feb9c9e9a7b3a"},"schema_version":"1.0"},"canonical_sha256":"418653bf72a53ba7be7e531ddd97d4c22150247f23b5abef605a5f7efd13390d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:08.838111Z","signature_b64":"MA1gwe4TGre7mlWTKQV/P/3y144vjGpWejyt04yaZTZNoTjfFdULu1dLqMb08ctyuWjQlLGK0h9u0s3rKkzZCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"418653bf72a53ba7be7e531ddd97d4c22150247f23b5abef605a5f7efd13390d","last_reissued_at":"2026-05-18T01:04:08.837673Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:08.837673Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1607.02881","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":"2026-05-18T01:04:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ak5w4X/tkmCjL/z/LvDxPx4RVWEJ2F8Ki+wzU7szToHhog7PJCacI0B8d+icgIieehbuwn5VVope6Plfwg7xAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T10:00:31.035476Z"},"content_sha256":"c70fb4bc96b13239138edd1731e099efa5b62a860579de2a92a7e488573e0ded","schema_version":"1.0","event_id":"sha256:c70fb4bc96b13239138edd1731e099efa5b62a860579de2a92a7e488573e0ded"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:IGDFHP3SUU52PPT6KMO53F6UYI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"X-ray spectral and optical properties of a ULX in NGC 4258 (M106)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Aysun Akyuz, Hasan Avdan, Inci Akkaya Oralhan, Nazim Aksaker, Senay Avdan, Solen Balman","submitted_at":"2016-07-11T10:02:09Z","abstract_excerpt":"We study the X-ray and optical properties of the ultraluminous X-ray source (ULX) X-6 in the nearby galaxy NGC 4258 (M106) based on the archival {\\it XMM-Newton}, {\\it Chandra}, {\\it Swift}, and {\\it Hubble Space Telescope} ({\\it HST}) observations. The source has a peak luminosity of $L_{\\mathrm{X}} \\sim 2 \\times 10^{39}$ erg s$^{-1}$ in the {\\it XMM-Newton} observation of 2004 June. Consideration of the hardness ratios and spectral model parameters shows that the source seems to exhibit possible spectral variations throughout the X-ray observations. In the images from the {\\it HST}/Advanced "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.02881","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":""},"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":"2026-05-18T01:04:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Iy+0+GWFsjWgPFiTVUXpqun84HyLiD8HaFQrnfsxlGI6xzqazPYM/nEjGm2M5A7mZqxHXR1KQIV78+MEDfThBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T10:00:31.035998Z"},"content_sha256":"aa809ce6f42c01cf773b74d6d700c8f1580c7b4b37bdf9e023b77df40f4cabf4","schema_version":"1.0","event_id":"sha256:aa809ce6f42c01cf773b74d6d700c8f1580c7b4b37bdf9e023b77df40f4cabf4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IGDFHP3SUU52PPT6KMO53F6UYI/bundle.json","state_url":"https://pith.science/pith/IGDFHP3SUU52PPT6KMO53F6UYI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IGDFHP3SUU52PPT6KMO53F6UYI/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":"2026-05-31T10:00:31Z","links":{"resolver":"https://pith.science/pith/IGDFHP3SUU52PPT6KMO53F6UYI","bundle":"https://pith.science/pith/IGDFHP3SUU52PPT6KMO53F6UYI/bundle.json","state":"https://pith.science/pith/IGDFHP3SUU52PPT6KMO53F6UYI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IGDFHP3SUU52PPT6KMO53F6UYI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:IGDFHP3SUU52PPT6KMO53F6UYI","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":"00878c4d285998e151de70f6eb44ea91b1216f990670d65fb93feb9c9e9a7b3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-07-11T10:02:09Z","title_canon_sha256":"16c0f9974f6bfbc805829513d59290652a3b3552b5da9c66af89242dc8a398e7"},"schema_version":"1.0","source":{"id":"1607.02881","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1607.02881","created_at":"2026-05-18T01:04:08Z"},{"alias_kind":"arxiv_version","alias_value":"1607.02881v2","created_at":"2026-05-18T01:04:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1607.02881","created_at":"2026-05-18T01:04:08Z"},{"alias_kind":"pith_short_12","alias_value":"IGDFHP3SUU52","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"IGDFHP3SUU52PPT6","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"IGDFHP3S","created_at":"2026-05-18T12:30:22Z"}],"graph_snapshots":[{"event_id":"sha256:aa809ce6f42c01cf773b74d6d700c8f1580c7b4b37bdf9e023b77df40f4cabf4","target":"graph","created_at":"2026-05-18T01:04:08Z","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 study the X-ray and optical properties of the ultraluminous X-ray source (ULX) X-6 in the nearby galaxy NGC 4258 (M106) based on the archival {\\it XMM-Newton}, {\\it Chandra}, {\\it Swift}, and {\\it Hubble Space Telescope} ({\\it HST}) observations. The source has a peak luminosity of $L_{\\mathrm{X}} \\sim 2 \\times 10^{39}$ erg s$^{-1}$ in the {\\it XMM-Newton} observation of 2004 June. Consideration of the hardness ratios and spectral model parameters shows that the source seems to exhibit possible spectral variations throughout the X-ray observations. In the images from the {\\it HST}/Advanced ","authors_text":"Aysun Akyuz, Hasan Avdan, Inci Akkaya Oralhan, Nazim Aksaker, Senay Avdan, Solen Balman","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-07-11T10:02:09Z","title":"X-ray spectral and optical properties of a ULX in NGC 4258 (M106)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1607.02881","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:c70fb4bc96b13239138edd1731e099efa5b62a860579de2a92a7e488573e0ded","target":"record","created_at":"2026-05-18T01:04:08Z","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":"00878c4d285998e151de70f6eb44ea91b1216f990670d65fb93feb9c9e9a7b3a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-07-11T10:02:09Z","title_canon_sha256":"16c0f9974f6bfbc805829513d59290652a3b3552b5da9c66af89242dc8a398e7"},"schema_version":"1.0","source":{"id":"1607.02881","kind":"arxiv","version":2}},"canonical_sha256":"418653bf72a53ba7be7e531ddd97d4c22150247f23b5abef605a5f7efd13390d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"418653bf72a53ba7be7e531ddd97d4c22150247f23b5abef605a5f7efd13390d","first_computed_at":"2026-05-18T01:04:08.837673Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:04:08.837673Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MA1gwe4TGre7mlWTKQV/P/3y144vjGpWejyt04yaZTZNoTjfFdULu1dLqMb08ctyuWjQlLGK0h9u0s3rKkzZCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:04:08.838111Z","signed_message":"canonical_sha256_bytes"},"source_id":"1607.02881","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c70fb4bc96b13239138edd1731e099efa5b62a860579de2a92a7e488573e0ded","sha256:aa809ce6f42c01cf773b74d6d700c8f1580c7b4b37bdf9e023b77df40f4cabf4"],"state_sha256":"56e82ed26da784a9e641247510e08681030c951eface203412c6d1151d5dbbe2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QvvdOsU+xv4mvF4bUv0tH+Xbe/cL5b4SO4Ism7CS6KFZDyJFPRD1vL08HCq1hULxsyTM3C7HFscFW6VrTftgCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T10:00:31.039084Z","bundle_sha256":"3e375670ec67ca11c7a2be5cc7c0181de9b08c16f6fe99ac9de62b54d3b6e729"}}