{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:VN56MJMDRNVJWBNEQILONGD7D3","short_pith_number":"pith:VN56MJMD","canonical_record":{"source":{"id":"2206.02159","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-06-05T12:09:40Z","cross_cats_sorted":[],"title_canon_sha256":"430956af406e4b265e3576cdddd49127b1e7e87159931355969d5105c03c9c1e","abstract_canon_sha256":"042d3acf490ebefd785d6c3c482f3675c2a81957bbd41b224ce60d034d8b50b0"},"schema_version":"1.0"},"canonical_sha256":"ab7be625838b6a9b05a48216e6987f1ec72d3392d0460edd4634f76e9ff809b9","source":{"kind":"arxiv","id":"2206.02159","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2206.02159","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"arxiv_version","alias_value":"2206.02159v1","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2206.02159","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"pith_short_12","alias_value":"VN56MJMDRNVJ","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"VN56MJMDRNVJWBNE","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"VN56MJMD","created_at":"2026-07-05T09:31:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:VN56MJMDRNVJWBNEQILONGD7D3","target":"record","payload":{"canonical_record":{"source":{"id":"2206.02159","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-06-05T12:09:40Z","cross_cats_sorted":[],"title_canon_sha256":"430956af406e4b265e3576cdddd49127b1e7e87159931355969d5105c03c9c1e","abstract_canon_sha256":"042d3acf490ebefd785d6c3c482f3675c2a81957bbd41b224ce60d034d8b50b0"},"schema_version":"1.0"},"canonical_sha256":"ab7be625838b6a9b05a48216e6987f1ec72d3392d0460edd4634f76e9ff809b9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:31:39.980145Z","signature_b64":"ymUYeBIM37j8Er55Cgq+oNQA9m28nCVx15QB52S1YMrkmztLT2Mj9v/R4Vkk8bBxwjy0U0pOA7r2YOfgWNK8Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ab7be625838b6a9b05a48216e6987f1ec72d3392d0460edd4634f76e9ff809b9","last_reissued_at":"2026-07-05T09:31:39.979649Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:31:39.979649Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2206.02159","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":"2026-07-05T09:31:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pYDqlKxRijJSPcsuGajXnBC0zjVKavBoItQWGSe2GX2CTP0LA6m8DXaWwEqA5AcA2RsgENEHsG4LCqdN+dGwBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T01:28:12.233929Z"},"content_sha256":"0f828a86f3596e3c51d1074f3fa1661d5e38a60fe142c7485d17dc9baddb389a","schema_version":"1.0","event_id":"sha256:0f828a86f3596e3c51d1074f3fa1661d5e38a60fe142c7485d17dc9baddb389a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:VN56MJMDRNVJWBNEQILONGD7D3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"X-ray intraday variability of the TeV blazar Mrk 421 with {\\it XMM-Newton}","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alicja Wierzcholska, Alok C.Gupta, A Priyana Noel, Gopal Bhatta, Haritma Gaur, Michal Ostrowski, Vinit Dhiman","submitted_at":"2022-06-05T12:09:40Z","abstract_excerpt":"Highly variable Markarian 421 is a bright high synchrotron energy peaked blazar showing wide featureless non-thermal spectrum making it a good candidate for our study of intraday flux and spectral variations over time. We analyse its X-ray observations of over 17 years taken with the EPIC-PN instrument to probe into the intraday variability properties. The photon energy band of 0.3 - 10.0 keV, and its sub-bands, soft 0.3-2.0 keV and hard 2.0-10.0 keV. To examine flux variability, fractional variability amplitude and the minimum variability timescale have been calculated. We also probed into th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2206.02159","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/2206.02159/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":"2026-07-05T09:31:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tRIssBo/gn+rMR52fPTlwOrbA9ji07hGqEY3cYXNoxqKJqNr4OZmzOEtHxT32+tnCRN24VYr4mCsAi76oLOsDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T01:28:12.235022Z"},"content_sha256":"7c2e39c1d7a4b4540b9989b656513d4bb203dcfd3bff06ee1b340fad4ad0186d","schema_version":"1.0","event_id":"sha256:7c2e39c1d7a4b4540b9989b656513d4bb203dcfd3bff06ee1b340fad4ad0186d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VN56MJMDRNVJWBNEQILONGD7D3/bundle.json","state_url":"https://pith.science/pith/VN56MJMDRNVJWBNEQILONGD7D3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VN56MJMDRNVJWBNEQILONGD7D3/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":"2026-08-14T01:28:12Z","links":{"resolver":"https://pith.science/pith/VN56MJMDRNVJWBNEQILONGD7D3","bundle":"https://pith.science/pith/VN56MJMDRNVJWBNEQILONGD7D3/bundle.json","state":"https://pith.science/pith/VN56MJMDRNVJWBNEQILONGD7D3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VN56MJMDRNVJWBNEQILONGD7D3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:VN56MJMDRNVJWBNEQILONGD7D3","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":"042d3acf490ebefd785d6c3c482f3675c2a81957bbd41b224ce60d034d8b50b0","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-06-05T12:09:40Z","title_canon_sha256":"430956af406e4b265e3576cdddd49127b1e7e87159931355969d5105c03c9c1e"},"schema_version":"1.0","source":{"id":"2206.02159","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2206.02159","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"arxiv_version","alias_value":"2206.02159v1","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2206.02159","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"pith_short_12","alias_value":"VN56MJMDRNVJ","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"pith_short_16","alias_value":"VN56MJMDRNVJWBNE","created_at":"2026-07-05T09:31:39Z"},{"alias_kind":"pith_short_8","alias_value":"VN56MJMD","created_at":"2026-07-05T09:31:39Z"}],"graph_snapshots":[{"event_id":"sha256:7c2e39c1d7a4b4540b9989b656513d4bb203dcfd3bff06ee1b340fad4ad0186d","target":"graph","created_at":"2026-07-05T09:31:39Z","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/2206.02159/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Highly variable Markarian 421 is a bright high synchrotron energy peaked blazar showing wide featureless non-thermal spectrum making it a good candidate for our study of intraday flux and spectral variations over time. We analyse its X-ray observations of over 17 years taken with the EPIC-PN instrument to probe into the intraday variability properties. The photon energy band of 0.3 - 10.0 keV, and its sub-bands, soft 0.3-2.0 keV and hard 2.0-10.0 keV. To examine flux variability, fractional variability amplitude and the minimum variability timescale have been calculated. We also probed into th","authors_text":"Alicja Wierzcholska, Alok C.Gupta, A Priyana Noel, Gopal Bhatta, Haritma Gaur, Michal Ostrowski, Vinit Dhiman","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-06-05T12:09:40Z","title":"X-ray intraday variability of the TeV blazar Mrk 421 with {\\it XMM-Newton}"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2206.02159","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":"sha256:0f828a86f3596e3c51d1074f3fa1661d5e38a60fe142c7485d17dc9baddb389a","target":"record","created_at":"2026-07-05T09:31:39Z","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":"042d3acf490ebefd785d6c3c482f3675c2a81957bbd41b224ce60d034d8b50b0","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2022-06-05T12:09:40Z","title_canon_sha256":"430956af406e4b265e3576cdddd49127b1e7e87159931355969d5105c03c9c1e"},"schema_version":"1.0","source":{"id":"2206.02159","kind":"arxiv","version":1}},"canonical_sha256":"ab7be625838b6a9b05a48216e6987f1ec72d3392d0460edd4634f76e9ff809b9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ab7be625838b6a9b05a48216e6987f1ec72d3392d0460edd4634f76e9ff809b9","first_computed_at":"2026-07-05T09:31:39.979649Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:31:39.979649Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ymUYeBIM37j8Er55Cgq+oNQA9m28nCVx15QB52S1YMrkmztLT2Mj9v/R4Vkk8bBxwjy0U0pOA7r2YOfgWNK8Bw==","signature_status":"signed_v1","signed_at":"2026-07-05T09:31:39.980145Z","signed_message":"canonical_sha256_bytes"},"source_id":"2206.02159","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0f828a86f3596e3c51d1074f3fa1661d5e38a60fe142c7485d17dc9baddb389a","sha256:7c2e39c1d7a4b4540b9989b656513d4bb203dcfd3bff06ee1b340fad4ad0186d"],"state_sha256":"74d8fcbf256c70d3e5718fd21a7103558cf64ff26614c3eba21d66f7ddb0a678"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Aa6baMq5L0sfEFbRpYLpV/mNOMZZ6mU5lI9QnHB2jFGrdm49ZZ2jVNTPZb/fnScxSQ5nI6nSV+v7VCdt+FrjAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T01:28:12.254855Z","bundle_sha256":"123ccfb5ad9ac81519e894e40af47d75c2c5bd9b984dc60b5bbb6d5bee225d5d"}}