{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:TB5FH5JOIP27KEJO2OIGVJUHV3","short_pith_number":"pith:TB5FH5JO","canonical_record":{"source":{"id":"1806.08249","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-21T13:55:17Z","cross_cats_sorted":[],"title_canon_sha256":"6a44d54456949b3b54246a53c9b98a58d54903b6f8d434e83f6b1ccc5c9fd1a8","abstract_canon_sha256":"dc7e120c3d13a3556ac2117a9581eca439f650a4ad832ee11d2fa642e41584c3"},"schema_version":"1.0"},"canonical_sha256":"987a53f52e43f5f5112ed3906aa687aeef53f9cfba1e45e9acf2bcf8818566c1","source":{"kind":"arxiv","id":"1806.08249","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.08249","created_at":"2026-05-18T00:08:06Z"},{"alias_kind":"arxiv_version","alias_value":"1806.08249v1","created_at":"2026-05-18T00:08:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.08249","created_at":"2026-05-18T00:08:06Z"},{"alias_kind":"pith_short_12","alias_value":"TB5FH5JOIP27","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"TB5FH5JOIP27KEJO","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"TB5FH5JO","created_at":"2026-05-18T12:32:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:TB5FH5JOIP27KEJO2OIGVJUHV3","target":"record","payload":{"canonical_record":{"source":{"id":"1806.08249","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-21T13:55:17Z","cross_cats_sorted":[],"title_canon_sha256":"6a44d54456949b3b54246a53c9b98a58d54903b6f8d434e83f6b1ccc5c9fd1a8","abstract_canon_sha256":"dc7e120c3d13a3556ac2117a9581eca439f650a4ad832ee11d2fa642e41584c3"},"schema_version":"1.0"},"canonical_sha256":"987a53f52e43f5f5112ed3906aa687aeef53f9cfba1e45e9acf2bcf8818566c1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:06.341313Z","signature_b64":"DRbqpkuM3dcurXsSza4xOKjarC1AyohVqpQ7cG007AYlIjhoITSm9dMB9g0oBMmQsRsep2OTWg/pRTKhBqK2Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"987a53f52e43f5f5112ed3906aa687aeef53f9cfba1e45e9acf2bcf8818566c1","last_reissued_at":"2026-05-18T00:08:06.340616Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:06.340616Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1806.08249","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":"2026-05-18T00:08:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lato4V0GJ3ycHTG9WcoyfCncJPgfc5M6sIzuuwMMSw5vlfaCz2zJuUqD6eMp5KqPDbfYWGl5q7RSs48l813gBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:42:27.666610Z"},"content_sha256":"a8c310536b83f1ff1af5e6a4bdc9078deca051de8895edc7601a22f9ad894b25","schema_version":"1.0","event_id":"sha256:a8c310536b83f1ff1af5e6a4bdc9078deca051de8895edc7601a22f9ad894b25"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:TB5FH5JOIP27KEJO2OIGVJUHV3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"What we learn from the X-ray grating spectra of Nova SMC 2016","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Dobrotka, C.E. Woodward, D.A.H. Buckley, E. Aydi, E. Behar, E. Gatuzz, G. Sala, J.P. Osborne, J.-U. Ness, K.L. Page, M. Della Valle, M. Henze, M. Hernanz, M. Orio, N. Ospina, P. Zemko, R.E. Williams, S. Ciroi, S. Starrfield, T. Rauch","submitted_at":"2018-06-21T13:55:17Z","abstract_excerpt":"Nova SMC 2016 has been the most luminous nova known in the direction of the Magellanic Clouds. It turned into a very luminous supersoft X-ray source between day 16 and 28 after the optical maximum. We observed it with Chandra, the HRC-S camera and the Low Energy Transmission Grating (LETG) on 2016 November and 2017 January (days 39 and 88 after optical maximum), and with XMM-Newton on 2016 December (day 75). We detected the compact white dwarf (WD) spectrum as a luminous supersoft X-ray continuum with deep absorption features of carbon, nitrogen, magnesium, calcium, probably argon and sulfur o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.08249","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":"2026-05-18T00:08:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kzaEHfr/bhIe3DeTSq4HMZx2HGezJcbyHGQ8NcCDUavr8CQ1OQKUkPxsBBeaynmp9VdXa3dsZxFaVVUiJKHXAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:42:27.667217Z"},"content_sha256":"bd4431fe42a417837e90158a776dd8fbf2188361f5a9447320cb2fef7eb22ca5","schema_version":"1.0","event_id":"sha256:bd4431fe42a417837e90158a776dd8fbf2188361f5a9447320cb2fef7eb22ca5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TB5FH5JOIP27KEJO2OIGVJUHV3/bundle.json","state_url":"https://pith.science/pith/TB5FH5JOIP27KEJO2OIGVJUHV3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TB5FH5JOIP27KEJO2OIGVJUHV3/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":"2026-05-25T23:42:27Z","links":{"resolver":"https://pith.science/pith/TB5FH5JOIP27KEJO2OIGVJUHV3","bundle":"https://pith.science/pith/TB5FH5JOIP27KEJO2OIGVJUHV3/bundle.json","state":"https://pith.science/pith/TB5FH5JOIP27KEJO2OIGVJUHV3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TB5FH5JOIP27KEJO2OIGVJUHV3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:TB5FH5JOIP27KEJO2OIGVJUHV3","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":"dc7e120c3d13a3556ac2117a9581eca439f650a4ad832ee11d2fa642e41584c3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-21T13:55:17Z","title_canon_sha256":"6a44d54456949b3b54246a53c9b98a58d54903b6f8d434e83f6b1ccc5c9fd1a8"},"schema_version":"1.0","source":{"id":"1806.08249","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1806.08249","created_at":"2026-05-18T00:08:06Z"},{"alias_kind":"arxiv_version","alias_value":"1806.08249v1","created_at":"2026-05-18T00:08:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1806.08249","created_at":"2026-05-18T00:08:06Z"},{"alias_kind":"pith_short_12","alias_value":"TB5FH5JOIP27","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"TB5FH5JOIP27KEJO","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"TB5FH5JO","created_at":"2026-05-18T12:32:53Z"}],"graph_snapshots":[{"event_id":"sha256:bd4431fe42a417837e90158a776dd8fbf2188361f5a9447320cb2fef7eb22ca5","target":"graph","created_at":"2026-05-18T00:08:06Z","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":"Nova SMC 2016 has been the most luminous nova known in the direction of the Magellanic Clouds. It turned into a very luminous supersoft X-ray source between day 16 and 28 after the optical maximum. We observed it with Chandra, the HRC-S camera and the Low Energy Transmission Grating (LETG) on 2016 November and 2017 January (days 39 and 88 after optical maximum), and with XMM-Newton on 2016 December (day 75). We detected the compact white dwarf (WD) spectrum as a luminous supersoft X-ray continuum with deep absorption features of carbon, nitrogen, magnesium, calcium, probably argon and sulfur o","authors_text":"A. Dobrotka, C.E. Woodward, D.A.H. Buckley, E. Aydi, E. Behar, E. Gatuzz, G. Sala, J.P. Osborne, J.-U. Ness, K.L. Page, M. Della Valle, M. Henze, M. Hernanz, M. Orio, N. Ospina, P. Zemko, R.E. Williams, S. Ciroi, S. Starrfield, T. Rauch","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-21T13:55:17Z","title":"What we learn from the X-ray grating spectra of Nova SMC 2016"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1806.08249","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:a8c310536b83f1ff1af5e6a4bdc9078deca051de8895edc7601a22f9ad894b25","target":"record","created_at":"2026-05-18T00:08:06Z","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":"dc7e120c3d13a3556ac2117a9581eca439f650a4ad832ee11d2fa642e41584c3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-06-21T13:55:17Z","title_canon_sha256":"6a44d54456949b3b54246a53c9b98a58d54903b6f8d434e83f6b1ccc5c9fd1a8"},"schema_version":"1.0","source":{"id":"1806.08249","kind":"arxiv","version":1}},"canonical_sha256":"987a53f52e43f5f5112ed3906aa687aeef53f9cfba1e45e9acf2bcf8818566c1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"987a53f52e43f5f5112ed3906aa687aeef53f9cfba1e45e9acf2bcf8818566c1","first_computed_at":"2026-05-18T00:08:06.340616Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:06.340616Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DRbqpkuM3dcurXsSza4xOKjarC1AyohVqpQ7cG007AYlIjhoITSm9dMB9g0oBMmQsRsep2OTWg/pRTKhBqK2Dw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:06.341313Z","signed_message":"canonical_sha256_bytes"},"source_id":"1806.08249","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a8c310536b83f1ff1af5e6a4bdc9078deca051de8895edc7601a22f9ad894b25","sha256:bd4431fe42a417837e90158a776dd8fbf2188361f5a9447320cb2fef7eb22ca5"],"state_sha256":"7f92dd79d5cb60313ead5ff7293ed85101244a0509fcbeaaf00cf6a32aeb542f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XVX5y1+2daB5kPWSz+2JRmrwKDOAC4KuPGxLYbQwGE8MKmPfA3JOkVQx/3Kxtn/JjZm5dwIv2pvk43A+Q0+eBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T23:42:27.670232Z","bundle_sha256":"f0dbbe77ee6ec4907c21f49263fef9dbcb6fc057cf709b46765d43a05e292abd"}}