{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:V25XYPU3DNQR7IYSFSE6A5H577","short_pith_number":"pith:V25XYPU3","canonical_record":{"source":{"id":"1811.11907","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-11-29T01:19:45Z","cross_cats_sorted":[],"title_canon_sha256":"2895b28088d66a4be11f2e9cd3a64be36f773da20ecb13a77def431535b6887f","abstract_canon_sha256":"4f83f765cd0e078bc51eb95a1d8c598da77d860b8499fda98f4c0eb097fa444c"},"schema_version":"1.0"},"canonical_sha256":"aebb7c3e9b1b611fa3122c89e074fdffdbaebcd389a39fb1f612a7898c3a6893","source":{"kind":"arxiv","id":"1811.11907","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.11907","created_at":"2026-05-17T23:58:01Z"},{"alias_kind":"arxiv_version","alias_value":"1811.11907v1","created_at":"2026-05-17T23:58:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.11907","created_at":"2026-05-17T23:58:01Z"},{"alias_kind":"pith_short_12","alias_value":"V25XYPU3DNQR","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"V25XYPU3DNQR7IYS","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"V25XYPU3","created_at":"2026-05-18T12:32:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:V25XYPU3DNQR7IYSFSE6A5H577","target":"record","payload":{"canonical_record":{"source":{"id":"1811.11907","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-11-29T01:19:45Z","cross_cats_sorted":[],"title_canon_sha256":"2895b28088d66a4be11f2e9cd3a64be36f773da20ecb13a77def431535b6887f","abstract_canon_sha256":"4f83f765cd0e078bc51eb95a1d8c598da77d860b8499fda98f4c0eb097fa444c"},"schema_version":"1.0"},"canonical_sha256":"aebb7c3e9b1b611fa3122c89e074fdffdbaebcd389a39fb1f612a7898c3a6893","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:58:01.464491Z","signature_b64":"DELDmPRgC0Zq/ENJDKAR9q1xu27DMWLbdwZhQjfPTwQFqNcHykCptfmbCRSQvA5JEsJfPvrHioDnGG6Lk/iHAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aebb7c3e9b1b611fa3122c89e074fdffdbaebcd389a39fb1f612a7898c3a6893","last_reissued_at":"2026-05-17T23:58:01.464135Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:58:01.464135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.11907","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":"2026-05-17T23:58:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i2adjRNYUOLlYrCe9xd+EjO/+IXqyGw4nRjg10NVXt/MByYL2YZOs1RB8Frh8FLkTfxyOx6Bw/p6Lv36fJBhDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T13:41:07.676817Z"},"content_sha256":"ac16ede9dae01b3bd1d61c6402fb0fb2a0b896b4c4d70ef57f2ae4bb4fb63850","schema_version":"1.0","event_id":"sha256:ac16ede9dae01b3bd1d61c6402fb0fb2a0b896b4c4d70ef57f2ae4bb4fb63850"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:V25XYPU3DNQR7IYSFSE6A5H577","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"NGC 300 ULX1: A test case for accretion torque theory","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Chandreyee Maitra, Frank Haberl, Georgios Vasilopoulos, Stefania Carpano","submitted_at":"2018-11-29T01:19:45Z","abstract_excerpt":"NGC 300 ULX1 is a newly identified ultra-luminous X-ray pulsar. The system is associated with the supernova impostor SN 2010da that was later classified as a possible supergiant Be X-ray binary. In this work we report on the spin period evolution of the neutron star based on all the currently available X-ray observations of the system. We argue that the X-ray luminosity of the system has remained almost constant since 2010, at a level above ten times the Eddington limit. Moreover, we find evidence that the spin period of the neutron star evolved from ~126 s down to ~18 s within a period of abo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.11907","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":"2026-05-17T23:58:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X4nGftd92KsiU1xLwBAhrhiYITtKgR1DiLJrC59LVe6LKq0QYcQ1AWRBj/wSeB52lu58sdtVcV0cv962UKDNBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T13:41:07.677174Z"},"content_sha256":"b8d0fb6d4c436bab3124b6036994702dc85917979148ed801c48afc66f32cbfa","schema_version":"1.0","event_id":"sha256:b8d0fb6d4c436bab3124b6036994702dc85917979148ed801c48afc66f32cbfa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V25XYPU3DNQR7IYSFSE6A5H577/bundle.json","state_url":"https://pith.science/pith/V25XYPU3DNQR7IYSFSE6A5H577/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V25XYPU3DNQR7IYSFSE6A5H577/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":"2026-05-21T13:41:07Z","links":{"resolver":"https://pith.science/pith/V25XYPU3DNQR7IYSFSE6A5H577","bundle":"https://pith.science/pith/V25XYPU3DNQR7IYSFSE6A5H577/bundle.json","state":"https://pith.science/pith/V25XYPU3DNQR7IYSFSE6A5H577/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V25XYPU3DNQR7IYSFSE6A5H577/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:V25XYPU3DNQR7IYSFSE6A5H577","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":"4f83f765cd0e078bc51eb95a1d8c598da77d860b8499fda98f4c0eb097fa444c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-11-29T01:19:45Z","title_canon_sha256":"2895b28088d66a4be11f2e9cd3a64be36f773da20ecb13a77def431535b6887f"},"schema_version":"1.0","source":{"id":"1811.11907","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.11907","created_at":"2026-05-17T23:58:01Z"},{"alias_kind":"arxiv_version","alias_value":"1811.11907v1","created_at":"2026-05-17T23:58:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.11907","created_at":"2026-05-17T23:58:01Z"},{"alias_kind":"pith_short_12","alias_value":"V25XYPU3DNQR","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"V25XYPU3DNQR7IYS","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"V25XYPU3","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:b8d0fb6d4c436bab3124b6036994702dc85917979148ed801c48afc66f32cbfa","target":"graph","created_at":"2026-05-17T23:58:01Z","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 300 ULX1 is a newly identified ultra-luminous X-ray pulsar. The system is associated with the supernova impostor SN 2010da that was later classified as a possible supergiant Be X-ray binary. In this work we report on the spin period evolution of the neutron star based on all the currently available X-ray observations of the system. We argue that the X-ray luminosity of the system has remained almost constant since 2010, at a level above ten times the Eddington limit. Moreover, we find evidence that the spin period of the neutron star evolved from ~126 s down to ~18 s within a period of abo","authors_text":"Chandreyee Maitra, Frank Haberl, Georgios Vasilopoulos, Stefania Carpano","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-11-29T01:19:45Z","title":"NGC 300 ULX1: A test case for accretion torque theory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.11907","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:ac16ede9dae01b3bd1d61c6402fb0fb2a0b896b4c4d70ef57f2ae4bb4fb63850","target":"record","created_at":"2026-05-17T23:58:01Z","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":"4f83f765cd0e078bc51eb95a1d8c598da77d860b8499fda98f4c0eb097fa444c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-11-29T01:19:45Z","title_canon_sha256":"2895b28088d66a4be11f2e9cd3a64be36f773da20ecb13a77def431535b6887f"},"schema_version":"1.0","source":{"id":"1811.11907","kind":"arxiv","version":1}},"canonical_sha256":"aebb7c3e9b1b611fa3122c89e074fdffdbaebcd389a39fb1f612a7898c3a6893","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aebb7c3e9b1b611fa3122c89e074fdffdbaebcd389a39fb1f612a7898c3a6893","first_computed_at":"2026-05-17T23:58:01.464135Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:58:01.464135Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DELDmPRgC0Zq/ENJDKAR9q1xu27DMWLbdwZhQjfPTwQFqNcHykCptfmbCRSQvA5JEsJfPvrHioDnGG6Lk/iHAA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:58:01.464491Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.11907","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ac16ede9dae01b3bd1d61c6402fb0fb2a0b896b4c4d70ef57f2ae4bb4fb63850","sha256:b8d0fb6d4c436bab3124b6036994702dc85917979148ed801c48afc66f32cbfa"],"state_sha256":"bf831c86a2bf26e019343427dfc8f41ff4fb5aedf7e9937f0339889801daea98"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xhAP3JAxurtUOrkZNhKMTv1eh4Cun8OjQESv1yDszjex+4I3+LZbRP1NsElsGKifL5KaDnJRlu1QA9WxsbRVDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T13:41:07.679356Z","bundle_sha256":"11d2aa34d0b471b65fc4c842881939d979c80825c0b2146d2df8eb7774a89a73"}}