{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:VTFEEKSUZTM7EXMHGW267Q5WHT","short_pith_number":"pith:VTFEEKSU","canonical_record":{"source":{"id":"2005.08673","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-05-18T13:00:29Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"090690bad8333dac655382363cb5cb92b02beeb16ec5495d22994c5a5a694775","abstract_canon_sha256":"fb1760ea9a6236a0854cba690ff78c571d6c316d1902ac19c6bd1738ddda10e2"},"schema_version":"1.0"},"canonical_sha256":"acca422a54ccd9f25d8735b5efc3b63ce33d04184ce11503434b0949242a94d1","source":{"kind":"arxiv","id":"2005.08673","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2005.08673","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"arxiv_version","alias_value":"2005.08673v1","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2005.08673","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"pith_short_12","alias_value":"VTFEEKSUZTM7","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"pith_short_16","alias_value":"VTFEEKSUZTM7EXMH","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"pith_short_8","alias_value":"VTFEEKSU","created_at":"2026-07-05T01:30:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:VTFEEKSUZTM7EXMHGW267Q5WHT","target":"record","payload":{"canonical_record":{"source":{"id":"2005.08673","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-05-18T13:00:29Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"090690bad8333dac655382363cb5cb92b02beeb16ec5495d22994c5a5a694775","abstract_canon_sha256":"fb1760ea9a6236a0854cba690ff78c571d6c316d1902ac19c6bd1738ddda10e2"},"schema_version":"1.0"},"canonical_sha256":"acca422a54ccd9f25d8735b5efc3b63ce33d04184ce11503434b0949242a94d1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:30:31.990916Z","signature_b64":"dc6yCyLDJbaQB1soA2+5625j/8NdA/Il8cV7lN5//XTzzZQ9SXF6C1B8SPq2fqpLzQSXNZnv+/qZ+UHfXGNLBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"acca422a54ccd9f25d8735b5efc3b63ce33d04184ce11503434b0949242a94d1","last_reissued_at":"2026-07-05T01:30:31.990434Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:30:31.990434Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2005.08673","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":"2026-07-05T01:30:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TjYIDdVhXp967fyBiJ6lfRxfG6qmtBm+8Rn2HJAkqPHEuwOfeMf+uuOA/hUmpv+XHf80ZtVlRvwSORZiaN86Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-26T19:45:02.202269Z"},"content_sha256":"fd7c34224678eee4e566734e6b4c260d7adde359350ee9320cdba027456250e4","schema_version":"1.0","event_id":"sha256:fd7c34224678eee4e566734e6b4c260d7adde359350ee9320cdba027456250e4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:VTFEEKSUZTM7EXMHGW267Q5WHT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The EXOD search for faint transients in XMM-Newton observations: Method and discovery of four extragalactic Type I X-ray Bursters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"Damien T. Wojtowicz, In\\'es Pastor-Marazuela, Joeri van Leeuwen, Natalie A. Webb","submitted_at":"2020-05-18T13:00:29Z","abstract_excerpt":"XMM-Newton has produced an extensive X-ray source catalogue in which the standard pipeline determines the variability of sufficiently bright sources through chi-square and fractional variability tests. Faint sources, however, are not automatically checked for variability, thus overlooking faint, short timescale transients. Our goal is to find new faint, fast transients in XMM-Newton EPIC-pn observations. To that end we have created the EPIC-pn XMM-Newton Outburst Detector (EXOD) algorithm, which we run on the EPIC-pn data available in the 3XMM-DR8 catalogue. In EXOD, we compute the whole-field"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2005.08673","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2005.08673/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T01:30:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M+LgZutmWc8WcPqdLEeWbne68ujspWtsCMPLSA5rCUmmTRcnLrHWp7VAog53ROS1VKByjiS87ZvhHJNubYgRDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-26T19:45:02.202668Z"},"content_sha256":"6b2458783b9463a714cb98b5e3a46f5159364658458ffbec74081695942ba7d4","schema_version":"1.0","event_id":"sha256:6b2458783b9463a714cb98b5e3a46f5159364658458ffbec74081695942ba7d4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VTFEEKSUZTM7EXMHGW267Q5WHT/bundle.json","state_url":"https://pith.science/pith/VTFEEKSUZTM7EXMHGW267Q5WHT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VTFEEKSUZTM7EXMHGW267Q5WHT/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":"2026-07-26T19:45:02Z","links":{"resolver":"https://pith.science/pith/VTFEEKSUZTM7EXMHGW267Q5WHT","bundle":"https://pith.science/pith/VTFEEKSUZTM7EXMHGW267Q5WHT/bundle.json","state":"https://pith.science/pith/VTFEEKSUZTM7EXMHGW267Q5WHT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VTFEEKSUZTM7EXMHGW267Q5WHT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:VTFEEKSUZTM7EXMHGW267Q5WHT","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":"fb1760ea9a6236a0854cba690ff78c571d6c316d1902ac19c6bd1738ddda10e2","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-05-18T13:00:29Z","title_canon_sha256":"090690bad8333dac655382363cb5cb92b02beeb16ec5495d22994c5a5a694775"},"schema_version":"1.0","source":{"id":"2005.08673","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2005.08673","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"arxiv_version","alias_value":"2005.08673v1","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2005.08673","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"pith_short_12","alias_value":"VTFEEKSUZTM7","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"pith_short_16","alias_value":"VTFEEKSUZTM7EXMH","created_at":"2026-07-05T01:30:31Z"},{"alias_kind":"pith_short_8","alias_value":"VTFEEKSU","created_at":"2026-07-05T01:30:31Z"}],"graph_snapshots":[{"event_id":"sha256:6b2458783b9463a714cb98b5e3a46f5159364658458ffbec74081695942ba7d4","target":"graph","created_at":"2026-07-05T01:30:31Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2005.08673/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"XMM-Newton has produced an extensive X-ray source catalogue in which the standard pipeline determines the variability of sufficiently bright sources through chi-square and fractional variability tests. Faint sources, however, are not automatically checked for variability, thus overlooking faint, short timescale transients. Our goal is to find new faint, fast transients in XMM-Newton EPIC-pn observations. To that end we have created the EPIC-pn XMM-Newton Outburst Detector (EXOD) algorithm, which we run on the EPIC-pn data available in the 3XMM-DR8 catalogue. In EXOD, we compute the whole-field","authors_text":"Damien T. Wojtowicz, In\\'es Pastor-Marazuela, Joeri van Leeuwen, Natalie A. Webb","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-05-18T13:00:29Z","title":"The EXOD search for faint transients in XMM-Newton observations: Method and discovery of four extragalactic Type I X-ray Bursters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2005.08673","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:fd7c34224678eee4e566734e6b4c260d7adde359350ee9320cdba027456250e4","target":"record","created_at":"2026-07-05T01:30:31Z","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":"fb1760ea9a6236a0854cba690ff78c571d6c316d1902ac19c6bd1738ddda10e2","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-05-18T13:00:29Z","title_canon_sha256":"090690bad8333dac655382363cb5cb92b02beeb16ec5495d22994c5a5a694775"},"schema_version":"1.0","source":{"id":"2005.08673","kind":"arxiv","version":1}},"canonical_sha256":"acca422a54ccd9f25d8735b5efc3b63ce33d04184ce11503434b0949242a94d1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"acca422a54ccd9f25d8735b5efc3b63ce33d04184ce11503434b0949242a94d1","first_computed_at":"2026-07-05T01:30:31.990434Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:30:31.990434Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dc6yCyLDJbaQB1soA2+5625j/8NdA/Il8cV7lN5//XTzzZQ9SXF6C1B8SPq2fqpLzQSXNZnv+/qZ+UHfXGNLBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T01:30:31.990916Z","signed_message":"canonical_sha256_bytes"},"source_id":"2005.08673","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fd7c34224678eee4e566734e6b4c260d7adde359350ee9320cdba027456250e4","sha256:6b2458783b9463a714cb98b5e3a46f5159364658458ffbec74081695942ba7d4"],"state_sha256":"d7b484eca50073dbd0538ac830fec801ef1268a93e7726a4605a8f22ea560b49"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Fnl7TYHtsfH4gqNYUk9A5I9uz4sV8hte4AkHHOyEDBhvm/CsA3kgTPep5fxhWpSuEGQnYlUlnF3wZA+ZUGJ5Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-26T19:45:02.205127Z","bundle_sha256":"1c4544045d7ba8156a9280653cce848622a3b80f32b4d864a56dfd012aa1bc81"}}