{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:76K433M6GRQNLTUUXEK347EEHH","short_pith_number":"pith:76K433M6","canonical_record":{"source":{"id":"1805.06850","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-05-17T16:39:28Z","cross_cats_sorted":[],"title_canon_sha256":"0a013f04ceac1d40599f41544fd8690b0653a0990a1eb67bff4ab1f35b3a7f96","abstract_canon_sha256":"4af3f77c20c8388a0294ff0e46df25ca8ace4e7bb321c2fc3dbca21f83e40aa3"},"schema_version":"1.0"},"canonical_sha256":"ff95cded9e3460d5ce94b915be7c8439ee472a3941bb6534c0e1e92831726ca0","source":{"kind":"arxiv","id":"1805.06850","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.06850","created_at":"2026-05-18T00:15:43Z"},{"alias_kind":"arxiv_version","alias_value":"1805.06850v1","created_at":"2026-05-18T00:15:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.06850","created_at":"2026-05-18T00:15:43Z"},{"alias_kind":"pith_short_12","alias_value":"76K433M6GRQN","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"76K433M6GRQNLTUU","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"76K433M6","created_at":"2026-05-18T12:32:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:76K433M6GRQNLTUUXEK347EEHH","target":"record","payload":{"canonical_record":{"source":{"id":"1805.06850","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-05-17T16:39:28Z","cross_cats_sorted":[],"title_canon_sha256":"0a013f04ceac1d40599f41544fd8690b0653a0990a1eb67bff4ab1f35b3a7f96","abstract_canon_sha256":"4af3f77c20c8388a0294ff0e46df25ca8ace4e7bb321c2fc3dbca21f83e40aa3"},"schema_version":"1.0"},"canonical_sha256":"ff95cded9e3460d5ce94b915be7c8439ee472a3941bb6534c0e1e92831726ca0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:15:43.138200Z","signature_b64":"djUPN/vXtv6yBVWXDSrdiQtS62ql/Saw0uVPjiSQlL1INusn05xDCY09FEgSVkDZPqqd8HOhVL1ZpM/C6OKdBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff95cded9e3460d5ce94b915be7c8439ee472a3941bb6534c0e1e92831726ca0","last_reissued_at":"2026-05-18T00:15:43.137641Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:15:43.137641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.06850","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":"2026-05-18T00:15:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z08MeyWIA1GSPh0dOsY0SRpM/4iUcLtL4hbCZMsijC9ZrPYTPYHh5ZNOScOAw8rNJblUHs4ffeXwz9Y39t1cDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T06:35:21.673363Z"},"content_sha256":"787b1afe23f2d1d5fe56ef03c5e538bafe3b620ed3c53ef06620bcea938d52f2","schema_version":"1.0","event_id":"sha256:787b1afe23f2d1d5fe56ef03c5e538bafe3b620ed3c53ef06620bcea938d52f2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:76K433M6GRQNLTUUXEK347EEHH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A NICER look at the Aql X-1 hard state","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Craig Markwardt, Deepto Chakrabarty, Edward M. Cackett, Frederick K. Lamb, Gaurava K. Jaisawal, Gregory Prigozhin, Jeroen Homan, Jon M. Miller, Keith C. Gendreau, Laurens Keek, Peter Bult, Phil Uttley, Renee Ludlam, Sebastien Guillot, Simin Mahmoodifar, Steve Kenyon, Tod E. Strohmayer, Yang Soong, Zaven Arzoumanian","submitted_at":"2018-05-17T16:39:28Z","abstract_excerpt":"We report on a spectral-timing analysis of the neutron star low-mass X-ray binary Aql~X-1 with the Neutron Star Interior Composition Explorer (NICER) on the International Space Station. Aql~X-1 was observed with NICER during a dim outburst in 2017 July, collecting approximately $50$ ks of good exposure. The spectral and timing properties of the source correspond to that of an (hard) extreme island state in the atoll classification. We find that the fractional amplitude of the low frequency ($<0.3$ Hz) band-limited noise shows a dramatic turnover as a function of energy: it peaks at 0.5 keV wit"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.06850","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":"2026-05-18T00:15:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0oJId/R6/FOwf5dRoTX5rBcQS3UB0gYq3MQAbTGctmPX4jHNKIwXixCZEB/C6Hd9XglSRxVkTsTVr5CU4ld7Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T06:35:21.674096Z"},"content_sha256":"0eb373d085ce1c0ccd22c592cda579c9a033d01a5b86cc51fdb0a71e1cca7281","schema_version":"1.0","event_id":"sha256:0eb373d085ce1c0ccd22c592cda579c9a033d01a5b86cc51fdb0a71e1cca7281"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/76K433M6GRQNLTUUXEK347EEHH/bundle.json","state_url":"https://pith.science/pith/76K433M6GRQNLTUUXEK347EEHH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/76K433M6GRQNLTUUXEK347EEHH/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":"2026-05-22T06:35:21Z","links":{"resolver":"https://pith.science/pith/76K433M6GRQNLTUUXEK347EEHH","bundle":"https://pith.science/pith/76K433M6GRQNLTUUXEK347EEHH/bundle.json","state":"https://pith.science/pith/76K433M6GRQNLTUUXEK347EEHH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/76K433M6GRQNLTUUXEK347EEHH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:76K433M6GRQNLTUUXEK347EEHH","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":"4af3f77c20c8388a0294ff0e46df25ca8ace4e7bb321c2fc3dbca21f83e40aa3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-05-17T16:39:28Z","title_canon_sha256":"0a013f04ceac1d40599f41544fd8690b0653a0990a1eb67bff4ab1f35b3a7f96"},"schema_version":"1.0","source":{"id":"1805.06850","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.06850","created_at":"2026-05-18T00:15:43Z"},{"alias_kind":"arxiv_version","alias_value":"1805.06850v1","created_at":"2026-05-18T00:15:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.06850","created_at":"2026-05-18T00:15:43Z"},{"alias_kind":"pith_short_12","alias_value":"76K433M6GRQN","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_16","alias_value":"76K433M6GRQNLTUU","created_at":"2026-05-18T12:32:11Z"},{"alias_kind":"pith_short_8","alias_value":"76K433M6","created_at":"2026-05-18T12:32:11Z"}],"graph_snapshots":[{"event_id":"sha256:0eb373d085ce1c0ccd22c592cda579c9a033d01a5b86cc51fdb0a71e1cca7281","target":"graph","created_at":"2026-05-18T00:15:43Z","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 report on a spectral-timing analysis of the neutron star low-mass X-ray binary Aql~X-1 with the Neutron Star Interior Composition Explorer (NICER) on the International Space Station. Aql~X-1 was observed with NICER during a dim outburst in 2017 July, collecting approximately $50$ ks of good exposure. The spectral and timing properties of the source correspond to that of an (hard) extreme island state in the atoll classification. We find that the fractional amplitude of the low frequency ($<0.3$ Hz) band-limited noise shows a dramatic turnover as a function of energy: it peaks at 0.5 keV wit","authors_text":"Craig Markwardt, Deepto Chakrabarty, Edward M. Cackett, Frederick K. Lamb, Gaurava K. Jaisawal, Gregory Prigozhin, Jeroen Homan, Jon M. Miller, Keith C. Gendreau, Laurens Keek, Peter Bult, Phil Uttley, Renee Ludlam, Sebastien Guillot, Simin Mahmoodifar, Steve Kenyon, Tod E. Strohmayer, Yang Soong, Zaven Arzoumanian","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-05-17T16:39:28Z","title":"A NICER look at the Aql X-1 hard state"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.06850","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":"sha256:787b1afe23f2d1d5fe56ef03c5e538bafe3b620ed3c53ef06620bcea938d52f2","target":"record","created_at":"2026-05-18T00:15:43Z","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":"4af3f77c20c8388a0294ff0e46df25ca8ace4e7bb321c2fc3dbca21f83e40aa3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-05-17T16:39:28Z","title_canon_sha256":"0a013f04ceac1d40599f41544fd8690b0653a0990a1eb67bff4ab1f35b3a7f96"},"schema_version":"1.0","source":{"id":"1805.06850","kind":"arxiv","version":1}},"canonical_sha256":"ff95cded9e3460d5ce94b915be7c8439ee472a3941bb6534c0e1e92831726ca0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ff95cded9e3460d5ce94b915be7c8439ee472a3941bb6534c0e1e92831726ca0","first_computed_at":"2026-05-18T00:15:43.137641Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:15:43.137641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"djUPN/vXtv6yBVWXDSrdiQtS62ql/Saw0uVPjiSQlL1INusn05xDCY09FEgSVkDZPqqd8HOhVL1ZpM/C6OKdBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:15:43.138200Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.06850","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:787b1afe23f2d1d5fe56ef03c5e538bafe3b620ed3c53ef06620bcea938d52f2","sha256:0eb373d085ce1c0ccd22c592cda579c9a033d01a5b86cc51fdb0a71e1cca7281"],"state_sha256":"1b4167a00c90636fec9463c3a90982ae8abfa80b25df74442bcfb9643440c2c6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1kJunj75xzl4n9T1M9DoININ02vFdn+dqHlyA5Gpw6BOs1aFV6yn/o6fyu7+QP5klH8QPnRDD32c2YXaKV4ZAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T06:35:21.678297Z","bundle_sha256":"caa8adcc11c84ff724e8edce13bb23174286d7e75865c2fa4d1527c8d33199d8"}}