{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:243KGDRFHAO22MGIY7NKS2EM7Q","short_pith_number":"pith:243KGDRF","canonical_record":{"source":{"id":"1806.11444","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-29T14:37:08Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"2a039425df2cb9e111217f0c00db931f56d8b6d065c5436c8d8cd24a05c2154a","abstract_canon_sha256":"c2b6afe159e5a0ab2b05f6ca1295ef4c0b42f9ff9ec1593e22c648ad13ca5c4c"},"schema_version":"1.0"},"canonical_sha256":"d736a30e25381dad30c8c7daa9688cfc2284ad06e307dc7c25be021886a2c01c","source":{"kind":"arxiv","id":"1806.11444","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.11444","created_at":"2026-05-18T00:10:36Z"},{"alias_kind":"arxiv_version","alias_value":"1806.11444v1","created_at":"2026-05-18T00:10:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.11444","created_at":"2026-05-18T00:10:36Z"},{"alias_kind":"pith_short_12","alias_value":"243KGDRFHAO2","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"243KGDRFHAO22MGI","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"243KGDRF","created_at":"2026-05-18T12:31:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:243KGDRFHAO22MGIY7NKS2EM7Q","target":"record","payload":{"canonical_record":{"source":{"id":"1806.11444","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-29T14:37:08Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"2a039425df2cb9e111217f0c00db931f56d8b6d065c5436c8d8cd24a05c2154a","abstract_canon_sha256":"c2b6afe159e5a0ab2b05f6ca1295ef4c0b42f9ff9ec1593e22c648ad13ca5c4c"},"schema_version":"1.0"},"canonical_sha256":"d736a30e25381dad30c8c7daa9688cfc2284ad06e307dc7c25be021886a2c01c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:10:36.881844Z","signature_b64":"umn+gjpacbhrepGH0rzcblup26AKwnQAyA9NgNBquE/5adWuGkH7QXOCZzwY/kXzmuIPpN4wPqTwLHDh6IQjDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d736a30e25381dad30c8c7daa9688cfc2284ad06e307dc7c25be021886a2c01c","last_reissued_at":"2026-05-18T00:10:36.881414Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:10:36.881414Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1806.11444","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":"2026-05-18T00:10:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xCPDqCP4VV1dCL/uYOv0ERvAcLU5UU3NTehJnYbmIb6fOku5NiNsTfhmhSi7hAzVEnG6Ha8d6wCA9nNTczmjDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:55:33.093752Z"},"content_sha256":"b011fa1c4ba058e61b92f089aad27663204913007660a0c77dc5d0f33c44cbbd","schema_version":"1.0","event_id":"sha256:b011fa1c4ba058e61b92f089aad27663204913007660a0c77dc5d0f33c44cbbd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:243KGDRFHAO22MGIY7NKS2EM7Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The two Ultraluminous X-ray sources in the galaxy NGC 925","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"A. Wolter, F. Pintore, G. L. Israel, G. Rodr\\'iguez, G. Trinchieri, L. Zampieri, P. Esposito, P. Ochner, S. Mereghetti, S. Paiano","submitted_at":"2018-06-29T14:37:08Z","abstract_excerpt":"NGC 925 ULX-1 and ULX-2 are two ultraluminous X-ray sources in the galaxy NGC 925, at a distance of 8.5 Mpc. For the first time, we analyzed high quality, simultaneous XMM-Newton and NuSTAR data of both sources. Although at a first glance ULX-1 resembles an intermediate mass black hole candidate (IMBH) because of its high X-ray luminosity ($(2$$-$$4)\\times10^{40}$ erg s$^{-1}$) and its spectral/temporal features, a closer inspection shows that its properties are more similar to those of a typical super-Eddington accreting stellar black hole and we classify it as a `broadened disc' ultraluminou"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.11444","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":"2026-05-18T00:10:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qMTfU4lUy2UVLiBe4kuHeVEyQImxamomt6YS9W02x8s7fwJP+IzVnwpNgYd5rAFmjZ5K89ZLLQAiyV377jRKBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:55:33.094497Z"},"content_sha256":"9eff8277e517de51ced556915e8d5116e29f12d44fe11f6c957291c1f4bf3bdf","schema_version":"1.0","event_id":"sha256:9eff8277e517de51ced556915e8d5116e29f12d44fe11f6c957291c1f4bf3bdf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/243KGDRFHAO22MGIY7NKS2EM7Q/bundle.json","state_url":"https://pith.science/pith/243KGDRFHAO22MGIY7NKS2EM7Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/243KGDRFHAO22MGIY7NKS2EM7Q/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":"2026-05-25T18:55:33Z","links":{"resolver":"https://pith.science/pith/243KGDRFHAO22MGIY7NKS2EM7Q","bundle":"https://pith.science/pith/243KGDRFHAO22MGIY7NKS2EM7Q/bundle.json","state":"https://pith.science/pith/243KGDRFHAO22MGIY7NKS2EM7Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/243KGDRFHAO22MGIY7NKS2EM7Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:243KGDRFHAO22MGIY7NKS2EM7Q","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":"c2b6afe159e5a0ab2b05f6ca1295ef4c0b42f9ff9ec1593e22c648ad13ca5c4c","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-29T14:37:08Z","title_canon_sha256":"2a039425df2cb9e111217f0c00db931f56d8b6d065c5436c8d8cd24a05c2154a"},"schema_version":"1.0","source":{"id":"1806.11444","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.11444","created_at":"2026-05-18T00:10:36Z"},{"alias_kind":"arxiv_version","alias_value":"1806.11444v1","created_at":"2026-05-18T00:10:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.11444","created_at":"2026-05-18T00:10:36Z"},{"alias_kind":"pith_short_12","alias_value":"243KGDRFHAO2","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"243KGDRFHAO22MGI","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"243KGDRF","created_at":"2026-05-18T12:31:59Z"}],"graph_snapshots":[{"event_id":"sha256:9eff8277e517de51ced556915e8d5116e29f12d44fe11f6c957291c1f4bf3bdf","target":"graph","created_at":"2026-05-18T00:10:36Z","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":"NGC 925 ULX-1 and ULX-2 are two ultraluminous X-ray sources in the galaxy NGC 925, at a distance of 8.5 Mpc. For the first time, we analyzed high quality, simultaneous XMM-Newton and NuSTAR data of both sources. Although at a first glance ULX-1 resembles an intermediate mass black hole candidate (IMBH) because of its high X-ray luminosity ($(2$$-$$4)\\times10^{40}$ erg s$^{-1}$) and its spectral/temporal features, a closer inspection shows that its properties are more similar to those of a typical super-Eddington accreting stellar black hole and we classify it as a `broadened disc' ultraluminou","authors_text":"A. Wolter, F. Pintore, G. L. Israel, G. Rodr\\'iguez, G. Trinchieri, L. Zampieri, P. Esposito, P. Ochner, S. Mereghetti, S. Paiano","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-29T14:37:08Z","title":"The two Ultraluminous X-ray sources in the galaxy NGC 925"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.11444","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:b011fa1c4ba058e61b92f089aad27663204913007660a0c77dc5d0f33c44cbbd","target":"record","created_at":"2026-05-18T00:10:36Z","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":"c2b6afe159e5a0ab2b05f6ca1295ef4c0b42f9ff9ec1593e22c648ad13ca5c4c","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-29T14:37:08Z","title_canon_sha256":"2a039425df2cb9e111217f0c00db931f56d8b6d065c5436c8d8cd24a05c2154a"},"schema_version":"1.0","source":{"id":"1806.11444","kind":"arxiv","version":1}},"canonical_sha256":"d736a30e25381dad30c8c7daa9688cfc2284ad06e307dc7c25be021886a2c01c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d736a30e25381dad30c8c7daa9688cfc2284ad06e307dc7c25be021886a2c01c","first_computed_at":"2026-05-18T00:10:36.881414Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:10:36.881414Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"umn+gjpacbhrepGH0rzcblup26AKwnQAyA9NgNBquE/5adWuGkH7QXOCZzwY/kXzmuIPpN4wPqTwLHDh6IQjDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:10:36.881844Z","signed_message":"canonical_sha256_bytes"},"source_id":"1806.11444","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b011fa1c4ba058e61b92f089aad27663204913007660a0c77dc5d0f33c44cbbd","sha256:9eff8277e517de51ced556915e8d5116e29f12d44fe11f6c957291c1f4bf3bdf"],"state_sha256":"b99f73e58b57a26aa84b05cf79fd483e1b040a7962e745dbd2eb30ff3c58595d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8kOzLIxPLiUTHftL42lspA2vl3v0BYvPxv6jsmkfbo0pjI3wswXUhXimruW+hkrcGrpn4I/b1BeGiH7s96bTAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:55:33.098605Z","bundle_sha256":"1b757e689454190666210cced23d55ba2cbfac9871fa31b3fbe87f532e068936"}}