{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:QFXSOWDK7ENUOHZDCIJD7PQDAC","short_pith_number":"pith:QFXSOWDK","canonical_record":{"source":{"id":"2606.01792","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-01T07:11:36Z","cross_cats_sorted":[],"title_canon_sha256":"12b5ec76775fcc35423fa4350e102bde1baac99d178e976eddb016fe5dd88750","abstract_canon_sha256":"3aecd21e52f55028f0af999f7e7e68be91468f0ca51f45b9ae488361a1ce6452"},"schema_version":"1.0"},"canonical_sha256":"816f27586af91b471f2312123fbe0300abbb9653dd02ca1694bc6242fc2ed320","source":{"kind":"arxiv","id":"2606.01792","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.01792","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"arxiv_version","alias_value":"2606.01792v1","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.01792","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"pith_short_12","alias_value":"QFXSOWDK7ENU","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"pith_short_16","alias_value":"QFXSOWDK7ENUOHZD","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"pith_short_8","alias_value":"QFXSOWDK","created_at":"2026-06-02T02:04:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:QFXSOWDK7ENUOHZDCIJD7PQDAC","target":"record","payload":{"canonical_record":{"source":{"id":"2606.01792","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-01T07:11:36Z","cross_cats_sorted":[],"title_canon_sha256":"12b5ec76775fcc35423fa4350e102bde1baac99d178e976eddb016fe5dd88750","abstract_canon_sha256":"3aecd21e52f55028f0af999f7e7e68be91468f0ca51f45b9ae488361a1ce6452"},"schema_version":"1.0"},"canonical_sha256":"816f27586af91b471f2312123fbe0300abbb9653dd02ca1694bc6242fc2ed320","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-02T02:04:56.983344Z","signature_b64":"E1+wLVNEd9dbwbDJC4xycS3kS1cfMCurGeFYTrcvXmT1C7kkR260x31NEEj0GAhNKscDfOZBXmXPBxHoE5v6AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"816f27586af91b471f2312123fbe0300abbb9653dd02ca1694bc6242fc2ed320","last_reissued_at":"2026-06-02T02:04:56.982888Z","signature_status":"signed_v1","first_computed_at":"2026-06-02T02:04:56.982888Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.01792","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":"2026-06-02T02:04:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ES4QtkraQN979HweCoehoJgLRCNX5S0FXp75SobPX9k6ZrhdjqyNsL2gUFgJltBemJHJYhx349Tvhry84rFDDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T07:32:45.404043Z"},"content_sha256":"3f1d22d0c7ff7da04ed06525d36f05b5c5442d9aa7e32333d1bd2725ec6f3e37","schema_version":"1.0","event_id":"sha256:3f1d22d0c7ff7da04ed06525d36f05b5c5442d9aa7e32333d1bd2725ec6f3e37"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:QFXSOWDK7ENUOHZDCIJD7PQDAC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new Chandra look at the globular cluster NGC 6540 and its peculiar X-ray flaring source","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. De Luca, A. Sacchi, J. A. Irwin, M. Rigoselli, N. Sims, R. Di Stefano, S. Mereghetti","submitted_at":"2026-06-01T07:11:36Z","abstract_excerpt":"We report the results of a deep ($\\approx65$ ks) Chandra observation of the globular cluster NGC 6540, obtained to investigate the nature of the peculiar X-ray source 3XMM J180608.9$-$274553. This source was previously observed with XMM$-$Newton to exhibit a short ($\\approx300$ s) and intense X-ray flare whose luminosity and duration are inconsistent with both typical type I X-ray bursts from low mass X-ray binaries and stellar flares. Our new data show the presence of three faint X-ray sources near the position of the flare seen by XMM$-$Newton, only one of which was detected in a previous, m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.01792","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/2606.01792/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":"2026-06-02T02:04:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rsKEc0mtETbFD5ddJKJfTEv8pXMLMdDgl5ih4zgKd90g/Hbso66D9pAQ0bJolsdQxIqXHULAmlRBzpoqZZAXDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T07:32:45.404458Z"},"content_sha256":"3146fc4058c385217e32c1f63606387913ca535f1af6c334017ea5249aa786eb","schema_version":"1.0","event_id":"sha256:3146fc4058c385217e32c1f63606387913ca535f1af6c334017ea5249aa786eb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QFXSOWDK7ENUOHZDCIJD7PQDAC/bundle.json","state_url":"https://pith.science/pith/QFXSOWDK7ENUOHZDCIJD7PQDAC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QFXSOWDK7ENUOHZDCIJD7PQDAC/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":"2026-06-03T07:32:45Z","links":{"resolver":"https://pith.science/pith/QFXSOWDK7ENUOHZDCIJD7PQDAC","bundle":"https://pith.science/pith/QFXSOWDK7ENUOHZDCIJD7PQDAC/bundle.json","state":"https://pith.science/pith/QFXSOWDK7ENUOHZDCIJD7PQDAC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QFXSOWDK7ENUOHZDCIJD7PQDAC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:QFXSOWDK7ENUOHZDCIJD7PQDAC","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":"3aecd21e52f55028f0af999f7e7e68be91468f0ca51f45b9ae488361a1ce6452","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-01T07:11:36Z","title_canon_sha256":"12b5ec76775fcc35423fa4350e102bde1baac99d178e976eddb016fe5dd88750"},"schema_version":"1.0","source":{"id":"2606.01792","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.01792","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"arxiv_version","alias_value":"2606.01792v1","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.01792","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"pith_short_12","alias_value":"QFXSOWDK7ENU","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"pith_short_16","alias_value":"QFXSOWDK7ENUOHZD","created_at":"2026-06-02T02:04:56Z"},{"alias_kind":"pith_short_8","alias_value":"QFXSOWDK","created_at":"2026-06-02T02:04:56Z"}],"graph_snapshots":[{"event_id":"sha256:3146fc4058c385217e32c1f63606387913ca535f1af6c334017ea5249aa786eb","target":"graph","created_at":"2026-06-02T02:04:56Z","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/2606.01792/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report the results of a deep ($\\approx65$ ks) Chandra observation of the globular cluster NGC 6540, obtained to investigate the nature of the peculiar X-ray source 3XMM J180608.9$-$274553. This source was previously observed with XMM$-$Newton to exhibit a short ($\\approx300$ s) and intense X-ray flare whose luminosity and duration are inconsistent with both typical type I X-ray bursts from low mass X-ray binaries and stellar flares. Our new data show the presence of three faint X-ray sources near the position of the flare seen by XMM$-$Newton, only one of which was detected in a previous, m","authors_text":"A. De Luca, A. Sacchi, J. A. Irwin, M. Rigoselli, N. Sims, R. Di Stefano, S. Mereghetti","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-01T07:11:36Z","title":"A new Chandra look at the globular cluster NGC 6540 and its peculiar X-ray flaring source"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.01792","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":"sha256:3f1d22d0c7ff7da04ed06525d36f05b5c5442d9aa7e32333d1bd2725ec6f3e37","target":"record","created_at":"2026-06-02T02:04:56Z","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":"3aecd21e52f55028f0af999f7e7e68be91468f0ca51f45b9ae488361a1ce6452","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-01T07:11:36Z","title_canon_sha256":"12b5ec76775fcc35423fa4350e102bde1baac99d178e976eddb016fe5dd88750"},"schema_version":"1.0","source":{"id":"2606.01792","kind":"arxiv","version":1}},"canonical_sha256":"816f27586af91b471f2312123fbe0300abbb9653dd02ca1694bc6242fc2ed320","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"816f27586af91b471f2312123fbe0300abbb9653dd02ca1694bc6242fc2ed320","first_computed_at":"2026-06-02T02:04:56.982888Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-02T02:04:56.982888Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"E1+wLVNEd9dbwbDJC4xycS3kS1cfMCurGeFYTrcvXmT1C7kkR260x31NEEj0GAhNKscDfOZBXmXPBxHoE5v6AA==","signature_status":"signed_v1","signed_at":"2026-06-02T02:04:56.983344Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.01792","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3f1d22d0c7ff7da04ed06525d36f05b5c5442d9aa7e32333d1bd2725ec6f3e37","sha256:3146fc4058c385217e32c1f63606387913ca535f1af6c334017ea5249aa786eb"],"state_sha256":"5ae07cf4867a50ecb16bb26229a70bfebe10bef38afa54dd58c1c177af0de072"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v0lIpOY7r5Dj2G4qGksYlF9F92XwVf271VN7Fz3R/6yZ+KmpaIwyZHvXQOugZuCxTb8lRyHhcxFRyjvycA/yAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T07:32:45.406461Z","bundle_sha256":"da7bf4b2f453494a3a22a1e84be78d8b1184fdfb1a5c5ca3dec421b714a2ac47"}}