{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:EV7XG6ZHZVQNCFJOVAUPFSJ7AR","short_pith_number":"pith:EV7XG6ZH","canonical_record":{"source":{"id":"1809.08243","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-21T18:00:01Z","cross_cats_sorted":["astro-ph.EP","astro-ph.IM"],"title_canon_sha256":"522311358ab699f866632fea7229382b0527135b13cc0ed888d8bcb49f096d34","abstract_canon_sha256":"8046b79fcf11ca327c63e09fc132a8ae29261272af51d165b5c0260033d2a8fb"},"schema_version":"1.0"},"canonical_sha256":"257f737b27cd60d1152ea828f2c93f04615bb7da0ab08ec04bbbdec610e79814","source":{"kind":"arxiv","id":"1809.08243","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.08243","created_at":"2026-05-17T23:55:34Z"},{"alias_kind":"arxiv_version","alias_value":"1809.08243v2","created_at":"2026-05-17T23:55:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.08243","created_at":"2026-05-17T23:55:34Z"},{"alias_kind":"pith_short_12","alias_value":"EV7XG6ZHZVQN","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"EV7XG6ZHZVQNCFJO","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"EV7XG6ZH","created_at":"2026-05-18T12:32:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:EV7XG6ZHZVQNCFJOVAUPFSJ7AR","target":"record","payload":{"canonical_record":{"source":{"id":"1809.08243","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-21T18:00:01Z","cross_cats_sorted":["astro-ph.EP","astro-ph.IM"],"title_canon_sha256":"522311358ab699f866632fea7229382b0527135b13cc0ed888d8bcb49f096d34","abstract_canon_sha256":"8046b79fcf11ca327c63e09fc132a8ae29261272af51d165b5c0260033d2a8fb"},"schema_version":"1.0"},"canonical_sha256":"257f737b27cd60d1152ea828f2c93f04615bb7da0ab08ec04bbbdec610e79814","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:55:34.130620Z","signature_b64":"gk8GgHAbPmPY9LrkWQu+5s9Ycu9Qm+8rgaQYH4K75eIJMqoON27AMAtyUM7trscb2gjjHDlXd2XeA6gbgcxNDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"257f737b27cd60d1152ea828f2c93f04615bb7da0ab08ec04bbbdec610e79814","last_reissued_at":"2026-05-17T23:55:34.130011Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:55:34.130011Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1809.08243","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:55:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pSnLWW4BvSM/OTqdf57Mz49HG+HtaddvUSsQXCLhD2sjp4solvmfsIn/oyzIYJgVQGF2Gf4swa2FY5rV0RMYBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T23:22:32.463658Z"},"content_sha256":"387b8d9ee54b4990e59840b6b866022438470a4deac9e302fd1af84c1effa171","schema_version":"1.0","event_id":"sha256:387b8d9ee54b4990e59840b6b866022438470a4deac9e302fd1af84c1effa171"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:EV7XG6ZHZVQNCFJOVAUPFSJ7AR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First Resolution of Microlensed Images","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.EP","astro-ph.IM"],"primary_cat":"astro-ph.SR","authors_text":"A. M\\'erand, Andrew Gould (MPIA, B. J. Shappee, C.S. Kochanek, F. Delplancke-Str\\\"obele (ESO), G. W. Christie, J. L. Prieto, KASI, K. Z. Stanek, OSU), Ping Chen, Robert Mutel, R. Post, Subo Dong (KIAA-PKU), T. Natusch, Todd A. Thompson, T. W.-S. Holoien","submitted_at":"2018-09-21T18:00:01Z","abstract_excerpt":"We employ VLTI GRAVITY to resolve, for the first time, the two images generated by a gravitational microlens. The measurements of the image separation \\theta_{-,+}=3.78 +/- 0.05 mas, and hence the Einstein radius \\theta_E =1.87 +/- 0.03 mas, are precise. This demonstrates the robustness of the method, provided that the source is bright enough for GRAVITY (K <~ 10.5) and the image separation is of order or larger than the fringe spacing. When \\theta_E is combined with a measurement of the \"microlens parallax\" \\pi_E, the two will together yield the lens mass and lens-source relative parallax and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.08243","kind":"arxiv","version":2},"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":"2026-05-17T23:55:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VdCq3KrBwnZ41VGX4V6QmQj2+ADci3tR0qQJ5TeThX6UzHMaw2BLYmR3fakYaKcvfu4EFmuQgbRQa7Y28/4HCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T23:22:32.464167Z"},"content_sha256":"a588425db39cacec74de95812960cabc093008343a59c5bb55cec3c85c4abb76","schema_version":"1.0","event_id":"sha256:a588425db39cacec74de95812960cabc093008343a59c5bb55cec3c85c4abb76"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EV7XG6ZHZVQNCFJOVAUPFSJ7AR/bundle.json","state_url":"https://pith.science/pith/EV7XG6ZHZVQNCFJOVAUPFSJ7AR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EV7XG6ZHZVQNCFJOVAUPFSJ7AR/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":"2026-05-31T23:22:32Z","links":{"resolver":"https://pith.science/pith/EV7XG6ZHZVQNCFJOVAUPFSJ7AR","bundle":"https://pith.science/pith/EV7XG6ZHZVQNCFJOVAUPFSJ7AR/bundle.json","state":"https://pith.science/pith/EV7XG6ZHZVQNCFJOVAUPFSJ7AR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EV7XG6ZHZVQNCFJOVAUPFSJ7AR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:EV7XG6ZHZVQNCFJOVAUPFSJ7AR","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":"8046b79fcf11ca327c63e09fc132a8ae29261272af51d165b5c0260033d2a8fb","cross_cats_sorted":["astro-ph.EP","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-21T18:00:01Z","title_canon_sha256":"522311358ab699f866632fea7229382b0527135b13cc0ed888d8bcb49f096d34"},"schema_version":"1.0","source":{"id":"1809.08243","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1809.08243","created_at":"2026-05-17T23:55:34Z"},{"alias_kind":"arxiv_version","alias_value":"1809.08243v2","created_at":"2026-05-17T23:55:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.08243","created_at":"2026-05-17T23:55:34Z"},{"alias_kind":"pith_short_12","alias_value":"EV7XG6ZHZVQN","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_16","alias_value":"EV7XG6ZHZVQNCFJO","created_at":"2026-05-18T12:32:22Z"},{"alias_kind":"pith_short_8","alias_value":"EV7XG6ZH","created_at":"2026-05-18T12:32:22Z"}],"graph_snapshots":[{"event_id":"sha256:a588425db39cacec74de95812960cabc093008343a59c5bb55cec3c85c4abb76","target":"graph","created_at":"2026-05-17T23:55:34Z","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 employ VLTI GRAVITY to resolve, for the first time, the two images generated by a gravitational microlens. The measurements of the image separation \\theta_{-,+}=3.78 +/- 0.05 mas, and hence the Einstein radius \\theta_E =1.87 +/- 0.03 mas, are precise. This demonstrates the robustness of the method, provided that the source is bright enough for GRAVITY (K <~ 10.5) and the image separation is of order or larger than the fringe spacing. When \\theta_E is combined with a measurement of the \"microlens parallax\" \\pi_E, the two will together yield the lens mass and lens-source relative parallax and","authors_text":"A. M\\'erand, Andrew Gould (MPIA, B. J. Shappee, C.S. Kochanek, F. Delplancke-Str\\\"obele (ESO), G. W. Christie, J. L. Prieto, KASI, K. Z. Stanek, OSU), Ping Chen, Robert Mutel, R. Post, Subo Dong (KIAA-PKU), T. Natusch, Todd A. Thompson, T. W.-S. Holoien","cross_cats":["astro-ph.EP","astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-21T18:00:01Z","title":"First Resolution of Microlensed Images"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.08243","kind":"arxiv","version":2},"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":"sha256:387b8d9ee54b4990e59840b6b866022438470a4deac9e302fd1af84c1effa171","target":"record","created_at":"2026-05-17T23:55:34Z","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":"8046b79fcf11ca327c63e09fc132a8ae29261272af51d165b5c0260033d2a8fb","cross_cats_sorted":["astro-ph.EP","astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-09-21T18:00:01Z","title_canon_sha256":"522311358ab699f866632fea7229382b0527135b13cc0ed888d8bcb49f096d34"},"schema_version":"1.0","source":{"id":"1809.08243","kind":"arxiv","version":2}},"canonical_sha256":"257f737b27cd60d1152ea828f2c93f04615bb7da0ab08ec04bbbdec610e79814","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"257f737b27cd60d1152ea828f2c93f04615bb7da0ab08ec04bbbdec610e79814","first_computed_at":"2026-05-17T23:55:34.130011Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:55:34.130011Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gk8GgHAbPmPY9LrkWQu+5s9Ycu9Qm+8rgaQYH4K75eIJMqoON27AMAtyUM7trscb2gjjHDlXd2XeA6gbgcxNDg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:55:34.130620Z","signed_message":"canonical_sha256_bytes"},"source_id":"1809.08243","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:387b8d9ee54b4990e59840b6b866022438470a4deac9e302fd1af84c1effa171","sha256:a588425db39cacec74de95812960cabc093008343a59c5bb55cec3c85c4abb76"],"state_sha256":"8ae79db5c470dd48971569d81d3a1bbbef2fa4b56e2aafbeaa5af887151c1295"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cEJoKh/CeBqxzX0jnSzMCJPoB5odqPx6xzZ/ePIIv7Tmxo36N7KOcPKjJCWpP80UEIub+psd6JHzYDyg/UlYDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T23:22:32.467688Z","bundle_sha256":"82f06b369670b2487cdeac70bffbbb990fb187f0b4dbf561f285f353f4637912"}}