{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:VL6X5Y4SI32SNKM6RTGHMSZFIC","short_pith_number":"pith:VL6X5Y4S","canonical_record":{"source":{"id":"1610.06611","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-10-20T21:24:17Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"62ccfece4f33f682453ce92c6a5744c1da96a338a6983a1d968861342acce9a8","abstract_canon_sha256":"00ca74e468a56a434bda6c50b8c5bd10bd096e06bfa9acaee1fbaad00da8367d"},"schema_version":"1.0"},"canonical_sha256":"aafd7ee39246f526a99e8ccc764b2540b8ddecb52292eee9b2ea3f648b48b888","source":{"kind":"arxiv","id":"1610.06611","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.06611","created_at":"2026-05-18T00:45:15Z"},{"alias_kind":"arxiv_version","alias_value":"1610.06611v2","created_at":"2026-05-18T00:45:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.06611","created_at":"2026-05-18T00:45:15Z"},{"alias_kind":"pith_short_12","alias_value":"VL6X5Y4SI32S","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VL6X5Y4SI32SNKM6","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VL6X5Y4S","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:VL6X5Y4SI32SNKM6RTGHMSZFIC","target":"record","payload":{"canonical_record":{"source":{"id":"1610.06611","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-10-20T21:24:17Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"62ccfece4f33f682453ce92c6a5744c1da96a338a6983a1d968861342acce9a8","abstract_canon_sha256":"00ca74e468a56a434bda6c50b8c5bd10bd096e06bfa9acaee1fbaad00da8367d"},"schema_version":"1.0"},"canonical_sha256":"aafd7ee39246f526a99e8ccc764b2540b8ddecb52292eee9b2ea3f648b48b888","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:45:15.269559Z","signature_b64":"plVo3Bs9V8v3kFKlZRPCdg0Qm+5tIv+NAqwY4FN7Xqpa+QeWcOtrCP5MjBw4ArcoZ2NoIGxsRMDF902ZQkeABw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aafd7ee39246f526a99e8ccc764b2540b8ddecb52292eee9b2ea3f648b48b888","last_reissued_at":"2026-05-18T00:45:15.268868Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:45:15.268868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.06611","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":"2026-05-18T00:45:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PaUan5ldrfZmvSBGWU7kNelosTB0k8mJbh+VRLV97qrSM15l/16N1DLf/wzyE2ym99N0sGxOTpGKGr0LetaLBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:35:16.234699Z"},"content_sha256":"966bec1820e1089214acd3a1761bfc69114367e243569aab461e2054832f29d6","schema_version":"1.0","event_id":"sha256:966bec1820e1089214acd3a1761bfc69114367e243569aab461e2054832f29d6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:VL6X5Y4SI32SNKM6RTGHMSZFIC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Broadband Spectral Variability of Holmberg IX X-1","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"A. C. Fabian, A. Ptak, D. Barret, D. J. Walton, D. Stern, F. A. Harrison, F. Fuerst, J. M. Miller, L. Tao, M. Bachetti, M. J. Middleton, V. Rana","submitted_at":"2016-10-20T21:24:17Z","abstract_excerpt":"We present results from four new broadband X-ray observations of the extreme ultraluminous X-ray source Holmberg IX X-1 ($L_{\\rm{X}} > 10^{40}$ erg/s), performed by $Suzaku$ and $NuSTAR$ in coordination. Combined with the archival data, we now have broadband observations of this remarkable source from six separate epochs. Two of these new observations probe lower fluxes than seen previously, allowing us to extend our knowledge of the broadband spectral variability exhibited. The spectra are well fit by two thermal blackbody components, which dominate the emission below 10 keV, as well as a ste"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.06611","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":"2026-05-18T00:45:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hXvCEBg+I/Qe+UhwaTMJb3Ssb6V6Fxe/XKOt1zy4i0WIbnHO/xkaiAxbSJ5oN6Ay1cAqKbVhWtmsGTaTv+jcBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:35:16.235380Z"},"content_sha256":"82586bb1839fcadebf73f434d9e5c600292dea5610c3452473490562de169f31","schema_version":"1.0","event_id":"sha256:82586bb1839fcadebf73f434d9e5c600292dea5610c3452473490562de169f31"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VL6X5Y4SI32SNKM6RTGHMSZFIC/bundle.json","state_url":"https://pith.science/pith/VL6X5Y4SI32SNKM6RTGHMSZFIC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VL6X5Y4SI32SNKM6RTGHMSZFIC/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":"2026-05-26T22:35:16Z","links":{"resolver":"https://pith.science/pith/VL6X5Y4SI32SNKM6RTGHMSZFIC","bundle":"https://pith.science/pith/VL6X5Y4SI32SNKM6RTGHMSZFIC/bundle.json","state":"https://pith.science/pith/VL6X5Y4SI32SNKM6RTGHMSZFIC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VL6X5Y4SI32SNKM6RTGHMSZFIC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:VL6X5Y4SI32SNKM6RTGHMSZFIC","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":"00ca74e468a56a434bda6c50b8c5bd10bd096e06bfa9acaee1fbaad00da8367d","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-10-20T21:24:17Z","title_canon_sha256":"62ccfece4f33f682453ce92c6a5744c1da96a338a6983a1d968861342acce9a8"},"schema_version":"1.0","source":{"id":"1610.06611","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.06611","created_at":"2026-05-18T00:45:15Z"},{"alias_kind":"arxiv_version","alias_value":"1610.06611v2","created_at":"2026-05-18T00:45:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.06611","created_at":"2026-05-18T00:45:15Z"},{"alias_kind":"pith_short_12","alias_value":"VL6X5Y4SI32S","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VL6X5Y4SI32SNKM6","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VL6X5Y4S","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:82586bb1839fcadebf73f434d9e5c600292dea5610c3452473490562de169f31","target":"graph","created_at":"2026-05-18T00:45:15Z","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 present results from four new broadband X-ray observations of the extreme ultraluminous X-ray source Holmberg IX X-1 ($L_{\\rm{X}} > 10^{40}$ erg/s), performed by $Suzaku$ and $NuSTAR$ in coordination. Combined with the archival data, we now have broadband observations of this remarkable source from six separate epochs. Two of these new observations probe lower fluxes than seen previously, allowing us to extend our knowledge of the broadband spectral variability exhibited. The spectra are well fit by two thermal blackbody components, which dominate the emission below 10 keV, as well as a ste","authors_text":"A. C. Fabian, A. Ptak, D. Barret, D. J. Walton, D. Stern, F. A. Harrison, F. Fuerst, J. M. Miller, L. Tao, M. Bachetti, M. J. Middleton, V. Rana","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-10-20T21:24:17Z","title":"The Broadband Spectral Variability of Holmberg IX X-1"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.06611","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":"sha256:966bec1820e1089214acd3a1761bfc69114367e243569aab461e2054832f29d6","target":"record","created_at":"2026-05-18T00:45:15Z","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":"00ca74e468a56a434bda6c50b8c5bd10bd096e06bfa9acaee1fbaad00da8367d","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-10-20T21:24:17Z","title_canon_sha256":"62ccfece4f33f682453ce92c6a5744c1da96a338a6983a1d968861342acce9a8"},"schema_version":"1.0","source":{"id":"1610.06611","kind":"arxiv","version":2}},"canonical_sha256":"aafd7ee39246f526a99e8ccc764b2540b8ddecb52292eee9b2ea3f648b48b888","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aafd7ee39246f526a99e8ccc764b2540b8ddecb52292eee9b2ea3f648b48b888","first_computed_at":"2026-05-18T00:45:15.268868Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:45:15.268868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"plVo3Bs9V8v3kFKlZRPCdg0Qm+5tIv+NAqwY4FN7Xqpa+QeWcOtrCP5MjBw4ArcoZ2NoIGxsRMDF902ZQkeABw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:45:15.269559Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.06611","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:966bec1820e1089214acd3a1761bfc69114367e243569aab461e2054832f29d6","sha256:82586bb1839fcadebf73f434d9e5c600292dea5610c3452473490562de169f31"],"state_sha256":"d3e5e0d1055333ff40a2233fc246d90f7dbd0938fbe0a7f40c80faa5ff6b8d5f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qMLgNAm8fdD3aOSshNZx4iZo6ZAKeX3DLdhL4HsNQ37jWIocsao+Oe5IDmKnoZeq+iRWIdA7BKj/FppV7od/Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T22:35:16.238343Z","bundle_sha256":"8d824afe959a01b879ccdf50e36b92c763c07f6fdb0dc2e9d4f3798bb0513f73"}}