{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:C75IRSJKDQFB2BGMQMX4L2YLDS","short_pith_number":"pith:C75IRSJK","canonical_record":{"source":{"id":"0901.4302","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-01-27T17:57:31Z","cross_cats_sorted":[],"title_canon_sha256":"e558d1bab8d3f1779359d3a9dcf413ffd146a4fb7a38be19a65a79b05a6ad1cd","abstract_canon_sha256":"3935b88519b2106a9403e114f83d2aa2631aea96b347a0dd10131d387a6a58e8"},"schema_version":"1.0"},"canonical_sha256":"17fa88c92a1c0a1d04cc832fc5eb0b1c98183767aaae38292971c0218ec5aad5","source":{"kind":"arxiv","id":"0901.4302","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0901.4302","created_at":"2026-05-18T04:29:17Z"},{"alias_kind":"arxiv_version","alias_value":"0901.4302v1","created_at":"2026-05-18T04:29:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0901.4302","created_at":"2026-05-18T04:29:17Z"},{"alias_kind":"pith_short_12","alias_value":"C75IRSJKDQFB","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"C75IRSJKDQFB2BGM","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"C75IRSJK","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:C75IRSJKDQFB2BGMQMX4L2YLDS","target":"record","payload":{"canonical_record":{"source":{"id":"0901.4302","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-01-27T17:57:31Z","cross_cats_sorted":[],"title_canon_sha256":"e558d1bab8d3f1779359d3a9dcf413ffd146a4fb7a38be19a65a79b05a6ad1cd","abstract_canon_sha256":"3935b88519b2106a9403e114f83d2aa2631aea96b347a0dd10131d387a6a58e8"},"schema_version":"1.0"},"canonical_sha256":"17fa88c92a1c0a1d04cc832fc5eb0b1c98183767aaae38292971c0218ec5aad5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:17.116376Z","signature_b64":"/YArJYbbztHbROiPFB2mheKRdXsBunvUyJEthpl6c7ZGr21U2c8+GQESioGxrGjVtzGr7FLR20PD/R1xTvxyAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"17fa88c92a1c0a1d04cc832fc5eb0b1c98183767aaae38292971c0218ec5aad5","last_reissued_at":"2026-05-18T04:29:17.115918Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:17.115918Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0901.4302","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":"2026-05-18T04:29:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tuSgDMv1dAIzY+O5VpgemvTrnG0VAL+0q0UtCoekMKP+B/Oxq+K4JdAoY/hTJTE/AuqrihnahF3r4l/jFvaFCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T15:44:56.972182Z"},"content_sha256":"93ccf944562f417822cacb3200d61a0a895e93a32f10e0e2e8fa25b851a327d7","schema_version":"1.0","event_id":"sha256:93ccf944562f417822cacb3200d61a0a895e93a32f10e0e2e8fa25b851a327d7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:C75IRSJKDQFB2BGMQMX4L2YLDS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Different types of ultraluminous X-ray sources in NGC 4631","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Kajal Ghosh (NASA-MSFC), Roberto Soria (MSSL-UCL)","submitted_at":"2009-01-27T17:57:31Z","abstract_excerpt":"We have re-examined the most luminous X-ray sources in the starburst galaxy NGC 4631, using XMM-Newton, Chandra and ROSAT data. The most interesting source is a highly variable supersoft ULX. We suggest that its bolometric luminosity ~ a few 10^{39} erg/s in the high/supersoft state: this is an order of magnitude lower than estimated in previous studies, thus reducing the need for extreme or exotic scenarios. Moreover, we find that this source was in a non-canonical low/soft (kT ~ 0.1-0.3 keV) state during the Chandra observation. By comparing the high and low state, we argue that the spectral"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0901.4302","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":"2026-05-18T04:29:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2XP0/qLIM15QIu2unF6cHcCKdcCiBjj88C47FjnTR798EJ6yEpV4mk92RH9Yg48stNsUJcJ7oCkZBXrDGcKRDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T15:44:56.972549Z"},"content_sha256":"75e4f6c028b888f4a881bbf9af7459fbd6a0ee5a7b222361fe8281418eb3ea19","schema_version":"1.0","event_id":"sha256:75e4f6c028b888f4a881bbf9af7459fbd6a0ee5a7b222361fe8281418eb3ea19"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C75IRSJKDQFB2BGMQMX4L2YLDS/bundle.json","state_url":"https://pith.science/pith/C75IRSJKDQFB2BGMQMX4L2YLDS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C75IRSJKDQFB2BGMQMX4L2YLDS/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":"2026-06-23T15:44:56Z","links":{"resolver":"https://pith.science/pith/C75IRSJKDQFB2BGMQMX4L2YLDS","bundle":"https://pith.science/pith/C75IRSJKDQFB2BGMQMX4L2YLDS/bundle.json","state":"https://pith.science/pith/C75IRSJKDQFB2BGMQMX4L2YLDS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C75IRSJKDQFB2BGMQMX4L2YLDS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:C75IRSJKDQFB2BGMQMX4L2YLDS","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":"3935b88519b2106a9403e114f83d2aa2631aea96b347a0dd10131d387a6a58e8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-01-27T17:57:31Z","title_canon_sha256":"e558d1bab8d3f1779359d3a9dcf413ffd146a4fb7a38be19a65a79b05a6ad1cd"},"schema_version":"1.0","source":{"id":"0901.4302","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0901.4302","created_at":"2026-05-18T04:29:17Z"},{"alias_kind":"arxiv_version","alias_value":"0901.4302v1","created_at":"2026-05-18T04:29:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0901.4302","created_at":"2026-05-18T04:29:17Z"},{"alias_kind":"pith_short_12","alias_value":"C75IRSJKDQFB","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"C75IRSJKDQFB2BGM","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"C75IRSJK","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:75e4f6c028b888f4a881bbf9af7459fbd6a0ee5a7b222361fe8281418eb3ea19","target":"graph","created_at":"2026-05-18T04:29:17Z","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 have re-examined the most luminous X-ray sources in the starburst galaxy NGC 4631, using XMM-Newton, Chandra and ROSAT data. The most interesting source is a highly variable supersoft ULX. We suggest that its bolometric luminosity ~ a few 10^{39} erg/s in the high/supersoft state: this is an order of magnitude lower than estimated in previous studies, thus reducing the need for extreme or exotic scenarios. Moreover, we find that this source was in a non-canonical low/soft (kT ~ 0.1-0.3 keV) state during the Chandra observation. By comparing the high and low state, we argue that the spectral","authors_text":"Kajal Ghosh (NASA-MSFC), Roberto Soria (MSSL-UCL)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-01-27T17:57:31Z","title":"Different types of ultraluminous X-ray sources in NGC 4631"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0901.4302","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":"sha256:93ccf944562f417822cacb3200d61a0a895e93a32f10e0e2e8fa25b851a327d7","target":"record","created_at":"2026-05-18T04:29:17Z","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":"3935b88519b2106a9403e114f83d2aa2631aea96b347a0dd10131d387a6a58e8","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-01-27T17:57:31Z","title_canon_sha256":"e558d1bab8d3f1779359d3a9dcf413ffd146a4fb7a38be19a65a79b05a6ad1cd"},"schema_version":"1.0","source":{"id":"0901.4302","kind":"arxiv","version":1}},"canonical_sha256":"17fa88c92a1c0a1d04cc832fc5eb0b1c98183767aaae38292971c0218ec5aad5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"17fa88c92a1c0a1d04cc832fc5eb0b1c98183767aaae38292971c0218ec5aad5","first_computed_at":"2026-05-18T04:29:17.115918Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:17.115918Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/YArJYbbztHbROiPFB2mheKRdXsBunvUyJEthpl6c7ZGr21U2c8+GQESioGxrGjVtzGr7FLR20PD/R1xTvxyAA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:17.116376Z","signed_message":"canonical_sha256_bytes"},"source_id":"0901.4302","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93ccf944562f417822cacb3200d61a0a895e93a32f10e0e2e8fa25b851a327d7","sha256:75e4f6c028b888f4a881bbf9af7459fbd6a0ee5a7b222361fe8281418eb3ea19"],"state_sha256":"e9ef34a9ba4c240fd8151c4688a4418792a27d3b9b34960972d04a60457677e6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S7pJbYieD50P3RJBESUErC1wBs/kgXaoDod5iSMUkE1rTOShzISwSpcQ4PbfIn1h+dl3KZjYwHH+eGjEVkZ8BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T15:44:56.974542Z","bundle_sha256":"90ab656e641706a97e8034c49dfbb333589193994c52b5d89f9fcad02b002c72"}}