{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:ITIJXZTYNA3V5IDQH6PLFSQXC3","short_pith_number":"pith:ITIJXZTY","canonical_record":{"source":{"id":"1602.02559","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-08T13:29:14Z","cross_cats_sorted":[],"title_canon_sha256":"e168a585031ce485ce387b5bb42d7f38122b5d91bb190d7fa588c8a129a1f682","abstract_canon_sha256":"b8135fd0578ae839f4ae80b52e6ebf3058e6fe6b44085fe7c89f0ffc335fe509"},"schema_version":"1.0"},"canonical_sha256":"44d09be67868375ea0703f9eb2ca1716c104df45e0e84d11ce0b09fcd3e81e82","source":{"kind":"arxiv","id":"1602.02559","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.02559","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"arxiv_version","alias_value":"1602.02559v1","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.02559","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"pith_short_12","alias_value":"ITIJXZTYNA3V","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"ITIJXZTYNA3V5IDQ","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"ITIJXZTY","created_at":"2026-05-18T12:30:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:ITIJXZTYNA3V5IDQH6PLFSQXC3","target":"record","payload":{"canonical_record":{"source":{"id":"1602.02559","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-08T13:29:14Z","cross_cats_sorted":[],"title_canon_sha256":"e168a585031ce485ce387b5bb42d7f38122b5d91bb190d7fa588c8a129a1f682","abstract_canon_sha256":"b8135fd0578ae839f4ae80b52e6ebf3058e6fe6b44085fe7c89f0ffc335fe509"},"schema_version":"1.0"},"canonical_sha256":"44d09be67868375ea0703f9eb2ca1716c104df45e0e84d11ce0b09fcd3e81e82","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:18:37.549461Z","signature_b64":"XjkT+nVVd8g0/gatuqEb47YFoTjpzcTdmu4EBBx5RcFZKp+Bq2j6TfL8TAxk2ZcjmzsIPutXL/XN2UhWThilCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"44d09be67868375ea0703f9eb2ca1716c104df45e0e84d11ce0b09fcd3e81e82","last_reissued_at":"2026-05-18T01:18:37.548840Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:18:37.548840Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1602.02559","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":"2026-05-18T01:18:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q3fHt+fdZQI//0QH6ZGvHVWkPKX30yNPFn3q3zO6svwcpYRaeCGuf5h9b3OVP1vNNd/6H4wcNjvQd5CVSOsLDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T17:49:33.965248Z"},"content_sha256":"6ed8a4fb274598479d621b780963086e749d94336ada8acc57e33e9f687fd439","schema_version":"1.0","event_id":"sha256:6ed8a4fb274598479d621b780963086e749d94336ada8acc57e33e9f687fd439"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:ITIJXZTYNA3V5IDQH6PLFSQXC3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectral analysis of SMC X-2 during its 2015 outburst","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"2, 2 - IUSS Pavia (I), 3) (1 - INAF/IASF Milano (I), 3 - INFN Pavia (I)), A. Tiengo (1, F. Pintore (1), L. Sidoli (1), N. La Palombara (1), P. Esposito (1), S. Mereghetti (1)","submitted_at":"2016-02-08T13:29:14Z","abstract_excerpt":"We report on the results of Swift and XMM-Newton observations of SMC X-2 during its last outburst in 2015 October, the first one since 2000. The source reached a very high luminosity ($L \\sim 10^{38}$ erg s$^{-1}$), which allowed us to perform a detailed analysis of its timing and spectral properties. We obtained a pulse period $P_{\\rm spin}$ = 2.372267(5) s and a characterization of the pulse profile also at low energies. The main spectral component is a hard ($\\Gamma \\simeq 0$) power-law model with an exponential cut-off, but at low energies we detected also a soft (with kT $\\simeq$ 0.15 keV"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.02559","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":"2026-05-18T01:18:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DI9Oti9pw+km9ZpMx6yjzvkiS+B8gCW+wIKEydiyA+bOBold0IE+fa8k7M7eDTJEST+NHMQ8jSKRfJzhStnVDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T17:49:33.965604Z"},"content_sha256":"ceb34611beab88fcec37fd5d0bc0b4f4b2d983046166d0c699be55998a690646","schema_version":"1.0","event_id":"sha256:ceb34611beab88fcec37fd5d0bc0b4f4b2d983046166d0c699be55998a690646"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ITIJXZTYNA3V5IDQH6PLFSQXC3/bundle.json","state_url":"https://pith.science/pith/ITIJXZTYNA3V5IDQH6PLFSQXC3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ITIJXZTYNA3V5IDQH6PLFSQXC3/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":"2026-06-28T17:49:33Z","links":{"resolver":"https://pith.science/pith/ITIJXZTYNA3V5IDQH6PLFSQXC3","bundle":"https://pith.science/pith/ITIJXZTYNA3V5IDQH6PLFSQXC3/bundle.json","state":"https://pith.science/pith/ITIJXZTYNA3V5IDQH6PLFSQXC3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ITIJXZTYNA3V5IDQH6PLFSQXC3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:ITIJXZTYNA3V5IDQH6PLFSQXC3","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":"b8135fd0578ae839f4ae80b52e6ebf3058e6fe6b44085fe7c89f0ffc335fe509","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-08T13:29:14Z","title_canon_sha256":"e168a585031ce485ce387b5bb42d7f38122b5d91bb190d7fa588c8a129a1f682"},"schema_version":"1.0","source":{"id":"1602.02559","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.02559","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"arxiv_version","alias_value":"1602.02559v1","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.02559","created_at":"2026-05-18T01:18:37Z"},{"alias_kind":"pith_short_12","alias_value":"ITIJXZTYNA3V","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_16","alias_value":"ITIJXZTYNA3V5IDQ","created_at":"2026-05-18T12:30:22Z"},{"alias_kind":"pith_short_8","alias_value":"ITIJXZTY","created_at":"2026-05-18T12:30:22Z"}],"graph_snapshots":[{"event_id":"sha256:ceb34611beab88fcec37fd5d0bc0b4f4b2d983046166d0c699be55998a690646","target":"graph","created_at":"2026-05-18T01:18:37Z","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 the results of Swift and XMM-Newton observations of SMC X-2 during its last outburst in 2015 October, the first one since 2000. The source reached a very high luminosity ($L \\sim 10^{38}$ erg s$^{-1}$), which allowed us to perform a detailed analysis of its timing and spectral properties. We obtained a pulse period $P_{\\rm spin}$ = 2.372267(5) s and a characterization of the pulse profile also at low energies. The main spectral component is a hard ($\\Gamma \\simeq 0$) power-law model with an exponential cut-off, but at low energies we detected also a soft (with kT $\\simeq$ 0.15 keV","authors_text":"2, 2 - IUSS Pavia (I), 3) (1 - INAF/IASF Milano (I), 3 - INFN Pavia (I)), A. Tiengo (1, F. Pintore (1), L. Sidoli (1), N. La Palombara (1), P. Esposito (1), S. Mereghetti (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-08T13:29:14Z","title":"Spectral analysis of SMC X-2 during its 2015 outburst"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.02559","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":"sha256:6ed8a4fb274598479d621b780963086e749d94336ada8acc57e33e9f687fd439","target":"record","created_at":"2026-05-18T01:18:37Z","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":"b8135fd0578ae839f4ae80b52e6ebf3058e6fe6b44085fe7c89f0ffc335fe509","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-08T13:29:14Z","title_canon_sha256":"e168a585031ce485ce387b5bb42d7f38122b5d91bb190d7fa588c8a129a1f682"},"schema_version":"1.0","source":{"id":"1602.02559","kind":"arxiv","version":1}},"canonical_sha256":"44d09be67868375ea0703f9eb2ca1716c104df45e0e84d11ce0b09fcd3e81e82","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"44d09be67868375ea0703f9eb2ca1716c104df45e0e84d11ce0b09fcd3e81e82","first_computed_at":"2026-05-18T01:18:37.548840Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:18:37.548840Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XjkT+nVVd8g0/gatuqEb47YFoTjpzcTdmu4EBBx5RcFZKp+Bq2j6TfL8TAxk2ZcjmzsIPutXL/XN2UhWThilCg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:18:37.549461Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.02559","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6ed8a4fb274598479d621b780963086e749d94336ada8acc57e33e9f687fd439","sha256:ceb34611beab88fcec37fd5d0bc0b4f4b2d983046166d0c699be55998a690646"],"state_sha256":"2751176dc6d9df73b0dd606ec809ea3a994b30180dea7012dd7840c2b6d8341a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3ph4RvL+40J7X5pVkYEPAcVkU5yOUhXpL64oDdDK8dyjHNNJi9hpgacfYXRMQTWo07//YJxUORWVo/35Gy4/Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T17:49:33.967512Z","bundle_sha256":"233287f98f03bfff2680759d71b3d60f37bb28ab3f3d17bf65ad3707124fa021"}}