{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:WST2K3NP7DW56JQR4MRDL3BVAV","short_pith_number":"pith:WST2K3NP","canonical_record":{"source":{"id":"1804.10858","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-04-29T01:22:09Z","cross_cats_sorted":[],"title_canon_sha256":"ccadc578ed8e83e948e01319033cca1de08617cf8b7375b19963ae269b6c1d6c","abstract_canon_sha256":"c403483d8f82c4bbec2204237b4e7f3fc6a1d44e4345a33dad28fb19e1de23d4"},"schema_version":"1.0"},"canonical_sha256":"b4a7a56daff8eddf2611e32235ec35056498d6e4ecd5dd12ac13bdb2d7def8de","source":{"kind":"arxiv","id":"1804.10858","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.10858","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"arxiv_version","alias_value":"1804.10858v2","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.10858","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"pith_short_12","alias_value":"WST2K3NP7DW5","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WST2K3NP7DW56JQR","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WST2K3NP","created_at":"2026-05-18T12:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:WST2K3NP7DW56JQR4MRDL3BVAV","target":"record","payload":{"canonical_record":{"source":{"id":"1804.10858","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-04-29T01:22:09Z","cross_cats_sorted":[],"title_canon_sha256":"ccadc578ed8e83e948e01319033cca1de08617cf8b7375b19963ae269b6c1d6c","abstract_canon_sha256":"c403483d8f82c4bbec2204237b4e7f3fc6a1d44e4345a33dad28fb19e1de23d4"},"schema_version":"1.0"},"canonical_sha256":"b4a7a56daff8eddf2611e32235ec35056498d6e4ecd5dd12ac13bdb2d7def8de","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:03:06.065181Z","signature_b64":"n5qTic3iyoXULLUwI1iS6o5jANqo8fCGeJitX5Iq2VA4LHHWdzUQO6HO29z4FyZskwh8g3pbMexW4xHkQiv9CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b4a7a56daff8eddf2611e32235ec35056498d6e4ecd5dd12ac13bdb2d7def8de","last_reissued_at":"2026-05-18T00:03:06.064488Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:03:06.064488Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.10858","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":"2026-05-18T00:03:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xTiDolET5OuTqLbo46ipKUDx4pQ+/X4K2tOjNb/peQVVTatOfelXzxWt7V2laUvwKWJEFDLs1l6l8WbM/F0TCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T05:32:59.506496Z"},"content_sha256":"51f027018e744ad7cc66dbf579651e338567a92e7f2a5e48ecb98888becf280e","schema_version":"1.0","event_id":"sha256:51f027018e744ad7cc66dbf579651e338567a92e7f2a5e48ecb98888becf280e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:WST2K3NP7DW56JQR4MRDL3BVAV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovery of 3 s pulsations from the Brightest Hard X-ray Source in M31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"(2) Anton Pannekoek Institute for Astronomy, (3) Scuola Universitaria Superiore IUSS, 4, (4) INAF--Istituto di Astrofisica Spaziale e Fisica Cosmica - Milano, 5), (5) INFN--Istituto Nazionale di Fisica Nucleare, Alessandro Papitto (1), Andrea De Luca (4) ((1) INAF--Osservatorio Astronomico di Roma, Andrea Tiengo (3, Gian Luca Israel (1), Guillermo A. Rodr\\'iguez Castillo (1), Luigi Stella (1), Paolo Esposito (2), Sezione di Pavia), University of Amsterdam","submitted_at":"2018-04-29T01:22:09Z","abstract_excerpt":"We report the discovery with XMM-Newton of 3-s X-ray pulsations from 3XMM J004232.1+411314, a dipping source that dominates the hard X-ray emission of M31. This finding unambiguously assesses the neutron star (NS) nature of the compact object. We also measured an orbital modulation of 4.15 h and a projected semi-axis at $a_{\\mathrm{X}} \\sin i= 0.6$ lt-s, which implies a low-mass companion of about 0.2$-$0.3$M_{\\odot}$ assuming a NS of 1.5 $M_{\\odot}$ and an orbital inclination $i=70^{\\circ}-80^{\\circ}$. The barycentric orbit-corrected pulse period decreased by $\\sim$28 ms in about 16 yr, corre"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.10858","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":"2026-05-18T00:03:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O4z4AtoyLMlXke5zVgeBOLWcLxIqRf7b+iaF7076kyTolaBChNfmcmkgOeDtofp9dtVUdepJKCzy3NZMskvSAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T05:32:59.506853Z"},"content_sha256":"6e5452b07004425ee004f7d49eaa0ed49fb07f8f165eed3bc649bda188ce6d6b","schema_version":"1.0","event_id":"sha256:6e5452b07004425ee004f7d49eaa0ed49fb07f8f165eed3bc649bda188ce6d6b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WST2K3NP7DW56JQR4MRDL3BVAV/bundle.json","state_url":"https://pith.science/pith/WST2K3NP7DW56JQR4MRDL3BVAV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WST2K3NP7DW56JQR4MRDL3BVAV/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":"2026-05-21T05:32:59Z","links":{"resolver":"https://pith.science/pith/WST2K3NP7DW56JQR4MRDL3BVAV","bundle":"https://pith.science/pith/WST2K3NP7DW56JQR4MRDL3BVAV/bundle.json","state":"https://pith.science/pith/WST2K3NP7DW56JQR4MRDL3BVAV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WST2K3NP7DW56JQR4MRDL3BVAV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WST2K3NP7DW56JQR4MRDL3BVAV","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":"c403483d8f82c4bbec2204237b4e7f3fc6a1d44e4345a33dad28fb19e1de23d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-04-29T01:22:09Z","title_canon_sha256":"ccadc578ed8e83e948e01319033cca1de08617cf8b7375b19963ae269b6c1d6c"},"schema_version":"1.0","source":{"id":"1804.10858","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.10858","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"arxiv_version","alias_value":"1804.10858v2","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.10858","created_at":"2026-05-18T00:03:06Z"},{"alias_kind":"pith_short_12","alias_value":"WST2K3NP7DW5","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"WST2K3NP7DW56JQR","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"WST2K3NP","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:6e5452b07004425ee004f7d49eaa0ed49fb07f8f165eed3bc649bda188ce6d6b","target":"graph","created_at":"2026-05-18T00:03:06Z","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 the discovery with XMM-Newton of 3-s X-ray pulsations from 3XMM J004232.1+411314, a dipping source that dominates the hard X-ray emission of M31. This finding unambiguously assesses the neutron star (NS) nature of the compact object. We also measured an orbital modulation of 4.15 h and a projected semi-axis at $a_{\\mathrm{X}} \\sin i= 0.6$ lt-s, which implies a low-mass companion of about 0.2$-$0.3$M_{\\odot}$ assuming a NS of 1.5 $M_{\\odot}$ and an orbital inclination $i=70^{\\circ}-80^{\\circ}$. The barycentric orbit-corrected pulse period decreased by $\\sim$28 ms in about 16 yr, corre","authors_text":"(2) Anton Pannekoek Institute for Astronomy, (3) Scuola Universitaria Superiore IUSS, 4, (4) INAF--Istituto di Astrofisica Spaziale e Fisica Cosmica - Milano, 5), (5) INFN--Istituto Nazionale di Fisica Nucleare, Alessandro Papitto (1), Andrea De Luca (4) ((1) INAF--Osservatorio Astronomico di Roma, Andrea Tiengo (3, Gian Luca Israel (1), Guillermo A. Rodr\\'iguez Castillo (1), Luigi Stella (1), Paolo Esposito (2), Sezione di Pavia), University of Amsterdam","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-04-29T01:22:09Z","title":"Discovery of 3 s pulsations from the Brightest Hard X-ray Source in M31"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.10858","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":"sha256:51f027018e744ad7cc66dbf579651e338567a92e7f2a5e48ecb98888becf280e","target":"record","created_at":"2026-05-18T00:03:06Z","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":"c403483d8f82c4bbec2204237b4e7f3fc6a1d44e4345a33dad28fb19e1de23d4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-04-29T01:22:09Z","title_canon_sha256":"ccadc578ed8e83e948e01319033cca1de08617cf8b7375b19963ae269b6c1d6c"},"schema_version":"1.0","source":{"id":"1804.10858","kind":"arxiv","version":2}},"canonical_sha256":"b4a7a56daff8eddf2611e32235ec35056498d6e4ecd5dd12ac13bdb2d7def8de","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b4a7a56daff8eddf2611e32235ec35056498d6e4ecd5dd12ac13bdb2d7def8de","first_computed_at":"2026-05-18T00:03:06.064488Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:03:06.064488Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"n5qTic3iyoXULLUwI1iS6o5jANqo8fCGeJitX5Iq2VA4LHHWdzUQO6HO29z4FyZskwh8g3pbMexW4xHkQiv9CA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:03:06.065181Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.10858","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:51f027018e744ad7cc66dbf579651e338567a92e7f2a5e48ecb98888becf280e","sha256:6e5452b07004425ee004f7d49eaa0ed49fb07f8f165eed3bc649bda188ce6d6b"],"state_sha256":"3de8702efc245b75f293501063a15548b935140d5b4ea3fbf7321b5e0de1df1b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pPYm5xb/ZbW+UzaVj8hNA0Tt73QO+c1nTBNHyIu332KuUbfCoiEBTLGCJXGkAiPSzWPhO46wkkxuvHRB6kyPBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T05:32:59.508833Z","bundle_sha256":"0db9d10f3eb80fddd8832d3826e6dd8ef830276e35bc661ae7c75e5737535bd0"}}