{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:D3NZZE6P6RU3IFUBYSWF7YQ7QU","short_pith_number":"pith:D3NZZE6P","canonical_record":{"source":{"id":"1810.01417","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-02T18:00:01Z","cross_cats_sorted":["astro-ph.GA","astro-ph.HE"],"title_canon_sha256":"e7e8c867b4c5d2c5cd56d46d562140d07185fe29db485758bd9c771d1bc3b95f","abstract_canon_sha256":"88944828f46d7fcf1f4dfbb37290de71fbecd92a20788294fd376b9a4a6facf0"},"schema_version":"1.0"},"canonical_sha256":"1edb9c93cff469b41681c4ac5fe21f852436265bd088a70f052447732b59355e","source":{"kind":"arxiv","id":"1810.01417","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.01417","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"arxiv_version","alias_value":"1810.01417v1","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.01417","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"pith_short_12","alias_value":"D3NZZE6P6RU3","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"D3NZZE6P6RU3IFUB","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"D3NZZE6P","created_at":"2026-05-18T12:32:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:D3NZZE6P6RU3IFUBYSWF7YQ7QU","target":"record","payload":{"canonical_record":{"source":{"id":"1810.01417","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-02T18:00:01Z","cross_cats_sorted":["astro-ph.GA","astro-ph.HE"],"title_canon_sha256":"e7e8c867b4c5d2c5cd56d46d562140d07185fe29db485758bd9c771d1bc3b95f","abstract_canon_sha256":"88944828f46d7fcf1f4dfbb37290de71fbecd92a20788294fd376b9a4a6facf0"},"schema_version":"1.0"},"canonical_sha256":"1edb9c93cff469b41681c4ac5fe21f852436265bd088a70f052447732b59355e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:01:28.015251Z","signature_b64":"wPoswyXHQyYSRmMblF2JWW/0IcxEdyUrvWWBuNy8tp78CCDOF0lzZY04kHdt6uoPYqafFqEoewgoNtjBr2BpAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1edb9c93cff469b41681c4ac5fe21f852436265bd088a70f052447732b59355e","last_reissued_at":"2026-05-18T00:01:28.014699Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:01:28.014699Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.01417","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":"2026-05-18T00:01:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vg4sEQVQP9q8MsHMMMLHSbH8sfR3DF5iEpWSDfqnbGiD0mccKy9OflO3l5XfATvjtUZfUGBSUHPIQhIBYoTxAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T11:15:17.958024Z"},"content_sha256":"b2eb7b879e66e6f0314a654cb3dc941a431f349266f39c5a50db340228b02ec0","schema_version":"1.0","event_id":"sha256:b2eb7b879e66e6f0314a654cb3dc941a431f349266f39c5a50db340228b02ec0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:D3NZZE6P6RU3IFUBYSWF7YQ7QU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A search for black hole microlensing signatures in globular cluster NGC 6656 (M 22)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.HE"],"primary_cat":"astro-ph.SR","authors_text":"A. Calamida, D. M. Bramich, J. Anderson, K. C. Sahu, N. Kains, S. Casertano","submitted_at":"2018-10-02T18:00:01Z","abstract_excerpt":"We report the results of a study aiming to detect signs of astrometric microlensing caused by an intermediate-mass black hole (IMBH) in the center of globular cluster M 22 (NGC 6656). We used archival data from the Hubble Space Telescope (HST) taken between 1995 and 2014, to derive long-baseline astrometric time series for stars near the center of the cluster, using state-of-the-art software to extract high-precision astrometry from images. We then modelled these time-series data, and compared microlensing model fits to simple linear proper-motion fits for each selected star. We find no eviden"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.01417","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":"2026-05-18T00:01:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hnP0tWLVmkKiNsvGiUQLzMbMwJfp+Jj2GOFCxpZOggVPBVSQCghUyiKbVgXkIewmXJ6ByyR3c8KO6YdCDDQDDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T11:15:17.958747Z"},"content_sha256":"9c900bb97318d310867df7de8b6cc7dfcb270228b52151730b54772f077fcc68","schema_version":"1.0","event_id":"sha256:9c900bb97318d310867df7de8b6cc7dfcb270228b52151730b54772f077fcc68"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/D3NZZE6P6RU3IFUBYSWF7YQ7QU/bundle.json","state_url":"https://pith.science/pith/D3NZZE6P6RU3IFUBYSWF7YQ7QU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/D3NZZE6P6RU3IFUBYSWF7YQ7QU/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":"2026-06-06T11:15:17Z","links":{"resolver":"https://pith.science/pith/D3NZZE6P6RU3IFUBYSWF7YQ7QU","bundle":"https://pith.science/pith/D3NZZE6P6RU3IFUBYSWF7YQ7QU/bundle.json","state":"https://pith.science/pith/D3NZZE6P6RU3IFUBYSWF7YQ7QU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/D3NZZE6P6RU3IFUBYSWF7YQ7QU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:D3NZZE6P6RU3IFUBYSWF7YQ7QU","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":"88944828f46d7fcf1f4dfbb37290de71fbecd92a20788294fd376b9a4a6facf0","cross_cats_sorted":["astro-ph.GA","astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-02T18:00:01Z","title_canon_sha256":"e7e8c867b4c5d2c5cd56d46d562140d07185fe29db485758bd9c771d1bc3b95f"},"schema_version":"1.0","source":{"id":"1810.01417","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.01417","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"arxiv_version","alias_value":"1810.01417v1","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.01417","created_at":"2026-05-18T00:01:28Z"},{"alias_kind":"pith_short_12","alias_value":"D3NZZE6P6RU3","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"D3NZZE6P6RU3IFUB","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"D3NZZE6P","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:9c900bb97318d310867df7de8b6cc7dfcb270228b52151730b54772f077fcc68","target":"graph","created_at":"2026-05-18T00:01:28Z","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 the results of a study aiming to detect signs of astrometric microlensing caused by an intermediate-mass black hole (IMBH) in the center of globular cluster M 22 (NGC 6656). We used archival data from the Hubble Space Telescope (HST) taken between 1995 and 2014, to derive long-baseline astrometric time series for stars near the center of the cluster, using state-of-the-art software to extract high-precision astrometry from images. We then modelled these time-series data, and compared microlensing model fits to simple linear proper-motion fits for each selected star. We find no eviden","authors_text":"A. Calamida, D. M. Bramich, J. Anderson, K. C. Sahu, N. Kains, S. Casertano","cross_cats":["astro-ph.GA","astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-02T18:00:01Z","title":"A search for black hole microlensing signatures in globular cluster NGC 6656 (M 22)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.01417","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:b2eb7b879e66e6f0314a654cb3dc941a431f349266f39c5a50db340228b02ec0","target":"record","created_at":"2026-05-18T00:01:28Z","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":"88944828f46d7fcf1f4dfbb37290de71fbecd92a20788294fd376b9a4a6facf0","cross_cats_sorted":["astro-ph.GA","astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-10-02T18:00:01Z","title_canon_sha256":"e7e8c867b4c5d2c5cd56d46d562140d07185fe29db485758bd9c771d1bc3b95f"},"schema_version":"1.0","source":{"id":"1810.01417","kind":"arxiv","version":1}},"canonical_sha256":"1edb9c93cff469b41681c4ac5fe21f852436265bd088a70f052447732b59355e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1edb9c93cff469b41681c4ac5fe21f852436265bd088a70f052447732b59355e","first_computed_at":"2026-05-18T00:01:28.014699Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:01:28.014699Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wPoswyXHQyYSRmMblF2JWW/0IcxEdyUrvWWBuNy8tp78CCDOF0lzZY04kHdt6uoPYqafFqEoewgoNtjBr2BpAA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:01:28.015251Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.01417","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b2eb7b879e66e6f0314a654cb3dc941a431f349266f39c5a50db340228b02ec0","sha256:9c900bb97318d310867df7de8b6cc7dfcb270228b52151730b54772f077fcc68"],"state_sha256":"96d70e880c312f07dedd2c897f1496bf11978e93fcf0fe17f0edff4d078392f0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t76oaXz2vHcFtaMa4hsgwl8Xls4adr8jIjvAiAZIEzch9SwscBL8BkVupafySnndPTqcRHHKp8YU1BDNGmIYCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T11:15:17.962591Z","bundle_sha256":"b42c5b414955cfeb10e80d6749ddef0a984ef6db271efbc4cde745760895882f"}}