{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:JH5BBH6Q2SLDF4APZJLFZUZJXG","short_pith_number":"pith:JH5BBH6Q","canonical_record":{"source":{"id":"1407.0112","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-01T06:28:38Z","cross_cats_sorted":[],"title_canon_sha256":"6785716341658b03e26784c118abd9b16e99dcd34442aad14917bee7dd2fc360","abstract_canon_sha256":"f3bfa3f64a1b592f798033f97af7e43a901feb9e92d0ed49d2627e5f27eb48ed"},"schema_version":"1.0"},"canonical_sha256":"49fa109fd0d49632f00fca565cd329b99e4b5d5ab1a2140faaeaffbcca7b6737","source":{"kind":"arxiv","id":"1407.0112","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.0112","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"arxiv_version","alias_value":"1407.0112v2","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.0112","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"pith_short_12","alias_value":"JH5BBH6Q2SLD","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_16","alias_value":"JH5BBH6Q2SLDF4AP","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_8","alias_value":"JH5BBH6Q","created_at":"2026-05-18T12:28:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:JH5BBH6Q2SLDF4APZJLFZUZJXG","target":"record","payload":{"canonical_record":{"source":{"id":"1407.0112","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-01T06:28:38Z","cross_cats_sorted":[],"title_canon_sha256":"6785716341658b03e26784c118abd9b16e99dcd34442aad14917bee7dd2fc360","abstract_canon_sha256":"f3bfa3f64a1b592f798033f97af7e43a901feb9e92d0ed49d2627e5f27eb48ed"},"schema_version":"1.0"},"canonical_sha256":"49fa109fd0d49632f00fca565cd329b99e4b5d5ab1a2140faaeaffbcca7b6737","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:42:43.181707Z","signature_b64":"0mFsRvlCNHaPU+VxEmp5SNvpkJwORGJkw4S5GkKBSTTrnjFgKsWDvM5ejmHHGPzOMZS7YDUaWXi4wMX3CbcJBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"49fa109fd0d49632f00fca565cd329b99e4b5d5ab1a2140faaeaffbcca7b6737","last_reissued_at":"2026-05-18T01:42:43.181055Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:42:43.181055Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.0112","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":"2026-05-18T01:42:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v6WPCpD3WGALUSAqEQZKLFjW6IbqfoSI9AWFXvpUPdnI3SX7JhaGehaowOv2xcrpiTSqUJWfgUEwEdF3ZufKDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T09:24:03.669594Z"},"content_sha256":"9f730a2998ffaf1ee637ebe5917eb362d2817ac16f35bc8e6984b87195acd05d","schema_version":"1.0","event_id":"sha256:9f730a2998ffaf1ee637ebe5917eb362d2817ac16f35bc8e6984b87195acd05d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:JH5BBH6Q2SLDF4APZJLFZUZJXG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"NuSTAR Detection Of A Cyclotron Line In The Supergiant Fast X-ray Transient IGR J17544-2619","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"(10) Columbia Astrophysics Laboratory, 11), (11) Institute of Astronomy, (12) Jet Propulsion Laboratory, (13) USRA, (14) NASA Goddard Space Flight Center), (2) INAF, (3) Space Sciences Laboratory, (4) Istituto Nazionale di Astrofisica, (5) Physics Department, (6) Cahill Center for Astronomy, (7) Kavli Institute for Astrophysics, (8) DTU Space, 9), (9) Lawrence Livermore National Laboratory, Astrophysics, Berkeley, California Institute of Technology, Caltech, Charles J. Hailey (10), Columbia University, Daniel Stern (12), David M. Smith (5), Deepto Chakrabarty (7), Eric Bellm (6), Felix Fuerst (6), Finn E. Christensen (8), Fiona A. Harrison (6), George Younes (13), INAF-IAPS, India, Istituto di Astrofisica Spaziale e Fisica Cosmica, John Tomsick (3), Kristin Madsen (6), Lorenzo Natalucci (4), MIT, National Space Institute, National Tsing Hua University, NSSTC, Patrizia Romano (2), Roman A. Krivonos (3), Santa Cruz, Santa Cruz Institute for Particle Physics, Space Research, Steven E. Boggs (3), Technical University of Denmark, Ting-Ni Lu (6, University of California, Varun Bhalerao (1), William W. Craig (3, William Zhang (14) ((1) Inter University Centre for Astronomy","submitted_at":"2014-07-01T06:28:38Z","abstract_excerpt":"We present NuSTAR spectral and timing studies of the Supergiant Fast X-ray Transient (SFXT) IGR J17544-2619. The spectrum is well-described by a ~1 keV blackbody and a hard continuum component, as expected from an accreting X-ray pulsar. We detect a cyclotron line at 17 keV, confirming that the compact object in IGR J17544-2619 is indeed a neutron star. This is the first measurement of the magnetic field in a SFXT. The inferred magnetic field strength, B = (1.45 +/- 0.03) * 10^12 G * (1+z) is typical of neutron stars in X-ray binaries, and rules out a magnetar nature for the compact object. We"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.0112","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":"2026-05-18T01:42:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NooOSAGIMz11h8GBY/pZxgzpa6rjtLQpe/54uaIADaqM949NvFvFQnNG4UCOSIxeimHIJ9zxUR0lHDt0duh0Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T09:24:03.669988Z"},"content_sha256":"d551f73bed975e1a53c037795bf0a2f25e3d35cea33afef500d5fcbef3a9613d","schema_version":"1.0","event_id":"sha256:d551f73bed975e1a53c037795bf0a2f25e3d35cea33afef500d5fcbef3a9613d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JH5BBH6Q2SLDF4APZJLFZUZJXG/bundle.json","state_url":"https://pith.science/pith/JH5BBH6Q2SLDF4APZJLFZUZJXG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JH5BBH6Q2SLDF4APZJLFZUZJXG/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":"2026-06-03T09:24:03Z","links":{"resolver":"https://pith.science/pith/JH5BBH6Q2SLDF4APZJLFZUZJXG","bundle":"https://pith.science/pith/JH5BBH6Q2SLDF4APZJLFZUZJXG/bundle.json","state":"https://pith.science/pith/JH5BBH6Q2SLDF4APZJLFZUZJXG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JH5BBH6Q2SLDF4APZJLFZUZJXG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:JH5BBH6Q2SLDF4APZJLFZUZJXG","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":"f3bfa3f64a1b592f798033f97af7e43a901feb9e92d0ed49d2627e5f27eb48ed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-01T06:28:38Z","title_canon_sha256":"6785716341658b03e26784c118abd9b16e99dcd34442aad14917bee7dd2fc360"},"schema_version":"1.0","source":{"id":"1407.0112","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.0112","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"arxiv_version","alias_value":"1407.0112v2","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.0112","created_at":"2026-05-18T01:42:43Z"},{"alias_kind":"pith_short_12","alias_value":"JH5BBH6Q2SLD","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_16","alias_value":"JH5BBH6Q2SLDF4AP","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_8","alias_value":"JH5BBH6Q","created_at":"2026-05-18T12:28:33Z"}],"graph_snapshots":[{"event_id":"sha256:d551f73bed975e1a53c037795bf0a2f25e3d35cea33afef500d5fcbef3a9613d","target":"graph","created_at":"2026-05-18T01:42:43Z","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 present NuSTAR spectral and timing studies of the Supergiant Fast X-ray Transient (SFXT) IGR J17544-2619. The spectrum is well-described by a ~1 keV blackbody and a hard continuum component, as expected from an accreting X-ray pulsar. We detect a cyclotron line at 17 keV, confirming that the compact object in IGR J17544-2619 is indeed a neutron star. This is the first measurement of the magnetic field in a SFXT. The inferred magnetic field strength, B = (1.45 +/- 0.03) * 10^12 G * (1+z) is typical of neutron stars in X-ray binaries, and rules out a magnetar nature for the compact object. We","authors_text":"(10) Columbia Astrophysics Laboratory, 11), (11) Institute of Astronomy, (12) Jet Propulsion Laboratory, (13) USRA, (14) NASA Goddard Space Flight Center), (2) INAF, (3) Space Sciences Laboratory, (4) Istituto Nazionale di Astrofisica, (5) Physics Department, (6) Cahill Center for Astronomy, (7) Kavli Institute for Astrophysics, (8) DTU Space, 9), (9) Lawrence Livermore National Laboratory, Astrophysics, Berkeley, California Institute of Technology, Caltech, Charles J. Hailey (10), Columbia University, Daniel Stern (12), David M. Smith (5), Deepto Chakrabarty (7), Eric Bellm (6), Felix Fuerst (6), Finn E. Christensen (8), Fiona A. Harrison (6), George Younes (13), INAF-IAPS, India, Istituto di Astrofisica Spaziale e Fisica Cosmica, John Tomsick (3), Kristin Madsen (6), Lorenzo Natalucci (4), MIT, National Space Institute, National Tsing Hua University, NSSTC, Patrizia Romano (2), Roman A. Krivonos (3), Santa Cruz, Santa Cruz Institute for Particle Physics, Space Research, Steven E. Boggs (3), Technical University of Denmark, Ting-Ni Lu (6, University of California, Varun Bhalerao (1), William W. Craig (3, William Zhang (14) ((1) Inter University Centre for Astronomy","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-01T06:28:38Z","title":"NuSTAR Detection Of A Cyclotron Line In The Supergiant Fast X-ray Transient IGR J17544-2619"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.0112","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":"sha256:9f730a2998ffaf1ee637ebe5917eb362d2817ac16f35bc8e6984b87195acd05d","target":"record","created_at":"2026-05-18T01:42:43Z","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":"f3bfa3f64a1b592f798033f97af7e43a901feb9e92d0ed49d2627e5f27eb48ed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-01T06:28:38Z","title_canon_sha256":"6785716341658b03e26784c118abd9b16e99dcd34442aad14917bee7dd2fc360"},"schema_version":"1.0","source":{"id":"1407.0112","kind":"arxiv","version":2}},"canonical_sha256":"49fa109fd0d49632f00fca565cd329b99e4b5d5ab1a2140faaeaffbcca7b6737","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"49fa109fd0d49632f00fca565cd329b99e4b5d5ab1a2140faaeaffbcca7b6737","first_computed_at":"2026-05-18T01:42:43.181055Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:42:43.181055Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0mFsRvlCNHaPU+VxEmp5SNvpkJwORGJkw4S5GkKBSTTrnjFgKsWDvM5ejmHHGPzOMZS7YDUaWXi4wMX3CbcJBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:42:43.181707Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.0112","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9f730a2998ffaf1ee637ebe5917eb362d2817ac16f35bc8e6984b87195acd05d","sha256:d551f73bed975e1a53c037795bf0a2f25e3d35cea33afef500d5fcbef3a9613d"],"state_sha256":"995c1132dc1a75506f891a2eaf764d09d1b25f82f35f883808884b45baa50ffc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K5hg+5OKDRRF+QPvN3Z3+sLk/uZ8VO5dWWvgyxtG4Z2INte4LqIb+FOABHujQQBLul8E70C7sNN+9w/uY7KnDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T09:24:03.672116Z","bundle_sha256":"97c5141914205f91da4aaf5eb09ae22cb117fbac33deda637bb2bff27a23e7c9"}}