{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:Z3XT4LUOL2PHN6SHFL6SQ573SE","short_pith_number":"pith:Z3XT4LUO","canonical_record":{"source":{"id":"2108.05212","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-11T13:21:29Z","cross_cats_sorted":[],"title_canon_sha256":"15d8298b95fb5b73d8b16ced058cdfbba534de48627811e58a3124a97b1814bc","abstract_canon_sha256":"acc78f7969738f39f780971f9ae8c790c73aa10d3cf3fb5766796271bbe48cb5"},"schema_version":"1.0"},"canonical_sha256":"ceef3e2e8e5e9e76fa472afd2877fb91098ba062cdab11e898f2abbd0216a5f5","source":{"kind":"arxiv","id":"2108.05212","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.05212","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"arxiv_version","alias_value":"2108.05212v1","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.05212","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"pith_short_12","alias_value":"Z3XT4LUOL2PH","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"pith_short_16","alias_value":"Z3XT4LUOL2PHN6SH","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"pith_short_8","alias_value":"Z3XT4LUO","created_at":"2026-07-05T03:21:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:Z3XT4LUOL2PHN6SHFL6SQ573SE","target":"record","payload":{"canonical_record":{"source":{"id":"2108.05212","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-11T13:21:29Z","cross_cats_sorted":[],"title_canon_sha256":"15d8298b95fb5b73d8b16ced058cdfbba534de48627811e58a3124a97b1814bc","abstract_canon_sha256":"acc78f7969738f39f780971f9ae8c790c73aa10d3cf3fb5766796271bbe48cb5"},"schema_version":"1.0"},"canonical_sha256":"ceef3e2e8e5e9e76fa472afd2877fb91098ba062cdab11e898f2abbd0216a5f5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:21:58.272308Z","signature_b64":"C/9m3Z4qxwPoo/eLIc9Y+KWNLo06XOoBx+8f5qpMTYAbGtHs57wtaoWnDWc5w2VnGx7MvP7jwfx+k3WoxaWYAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ceef3e2e8e5e9e76fa472afd2877fb91098ba062cdab11e898f2abbd0216a5f5","last_reissued_at":"2026-07-05T03:21:58.271762Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:21:58.271762Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.05212","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":"2026-07-05T03:21:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Gl07aIW6aWppChvtMGY5piHxhCdaI/qvxZxgqfTzjgs1B2Vvx+iEiqqacHDOJZ7KSBM+ypcynyqC4BSqyExdBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T08:46:08.607394Z"},"content_sha256":"68070ab2349cc373b80faec77c3792e4a7b8187161036ed2dc92c18e525ba1a6","schema_version":"1.0","event_id":"sha256:68070ab2349cc373b80faec77c3792e4a7b8187161036ed2dc92c18e525ba1a6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:Z3XT4LUOL2PHN6SHFL6SQ573SE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Revealing the structure of the lensed quasar Q 0957+561: I. Accretion disk size","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Hanslmeier, C. Fian, D. Chelouche, E. Mediavilla, J. A. Mu\\~noz, J. Jim\\'enez-Vicente, K. Rojas, P. Gom\\'ez-Alvarez, V. Motta","submitted_at":"2021-08-11T13:21:29Z","abstract_excerpt":"We aim to use signatures of microlensing induced by stars in the foreground lens galaxy to infer the size of the accretion disk in the gravitationally lensed quasar Q 0957+561. The long-term photometric monitoring of this system (which so far has provided the longest available light curves of a gravitational lens system) permits us to evaluate the impact of uncertainties on our recently developed method (controlled by the distance between the modeled and the experimental magnitude difference histograms between two lensed images), and thus to test the robustness of microlensing-based disk-size "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.05212","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/2108.05212/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":"2026-07-05T03:21:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"64a0TSRLzkZzKUeJ+iOXcKZhdrVi/6CHKBgkOCfPLyKhRpzpnDhxic4i+Li+ACiovpCagGHWKxdNNnobrvdVCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T08:46:08.607772Z"},"content_sha256":"0b2906eeae36cc641e7d9577a06d2f153c917780f3524905602830d580c17480","schema_version":"1.0","event_id":"sha256:0b2906eeae36cc641e7d9577a06d2f153c917780f3524905602830d580c17480"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z3XT4LUOL2PHN6SHFL6SQ573SE/bundle.json","state_url":"https://pith.science/pith/Z3XT4LUOL2PHN6SHFL6SQ573SE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z3XT4LUOL2PHN6SHFL6SQ573SE/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":"2026-07-21T08:46:08Z","links":{"resolver":"https://pith.science/pith/Z3XT4LUOL2PHN6SHFL6SQ573SE","bundle":"https://pith.science/pith/Z3XT4LUOL2PHN6SHFL6SQ573SE/bundle.json","state":"https://pith.science/pith/Z3XT4LUOL2PHN6SHFL6SQ573SE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z3XT4LUOL2PHN6SHFL6SQ573SE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:Z3XT4LUOL2PHN6SHFL6SQ573SE","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":"acc78f7969738f39f780971f9ae8c790c73aa10d3cf3fb5766796271bbe48cb5","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-11T13:21:29Z","title_canon_sha256":"15d8298b95fb5b73d8b16ced058cdfbba534de48627811e58a3124a97b1814bc"},"schema_version":"1.0","source":{"id":"2108.05212","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.05212","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"arxiv_version","alias_value":"2108.05212v1","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.05212","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"pith_short_12","alias_value":"Z3XT4LUOL2PH","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"pith_short_16","alias_value":"Z3XT4LUOL2PHN6SH","created_at":"2026-07-05T03:21:58Z"},{"alias_kind":"pith_short_8","alias_value":"Z3XT4LUO","created_at":"2026-07-05T03:21:58Z"}],"graph_snapshots":[{"event_id":"sha256:0b2906eeae36cc641e7d9577a06d2f153c917780f3524905602830d580c17480","target":"graph","created_at":"2026-07-05T03:21:58Z","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/2108.05212/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We aim to use signatures of microlensing induced by stars in the foreground lens galaxy to infer the size of the accretion disk in the gravitationally lensed quasar Q 0957+561. The long-term photometric monitoring of this system (which so far has provided the longest available light curves of a gravitational lens system) permits us to evaluate the impact of uncertainties on our recently developed method (controlled by the distance between the modeled and the experimental magnitude difference histograms between two lensed images), and thus to test the robustness of microlensing-based disk-size ","authors_text":"A. Hanslmeier, C. Fian, D. Chelouche, E. Mediavilla, J. A. Mu\\~noz, J. Jim\\'enez-Vicente, K. Rojas, P. Gom\\'ez-Alvarez, V. Motta","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-11T13:21:29Z","title":"Revealing the structure of the lensed quasar Q 0957+561: I. Accretion disk size"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.05212","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":"sha256:68070ab2349cc373b80faec77c3792e4a7b8187161036ed2dc92c18e525ba1a6","target":"record","created_at":"2026-07-05T03:21:58Z","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":"acc78f7969738f39f780971f9ae8c790c73aa10d3cf3fb5766796271bbe48cb5","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-11T13:21:29Z","title_canon_sha256":"15d8298b95fb5b73d8b16ced058cdfbba534de48627811e58a3124a97b1814bc"},"schema_version":"1.0","source":{"id":"2108.05212","kind":"arxiv","version":1}},"canonical_sha256":"ceef3e2e8e5e9e76fa472afd2877fb91098ba062cdab11e898f2abbd0216a5f5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ceef3e2e8e5e9e76fa472afd2877fb91098ba062cdab11e898f2abbd0216a5f5","first_computed_at":"2026-07-05T03:21:58.271762Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:21:58.271762Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C/9m3Z4qxwPoo/eLIc9Y+KWNLo06XOoBx+8f5qpMTYAbGtHs57wtaoWnDWc5w2VnGx7MvP7jwfx+k3WoxaWYAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:21:58.272308Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.05212","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:68070ab2349cc373b80faec77c3792e4a7b8187161036ed2dc92c18e525ba1a6","sha256:0b2906eeae36cc641e7d9577a06d2f153c917780f3524905602830d580c17480"],"state_sha256":"fa0fc873f80b397b65627c86042715caa6a02014a9ed93095ce00002154ec6df"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nByPo90lmcB2TZsx9GfFmq3Eqp8pUoTvnWawjbJRh4IU2Mt918taKvPYBT7XZGvJxBge1ZMDnYUPuypRbcs4BQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-21T08:46:08.609875Z","bundle_sha256":"ccde2045d409b3abf68c2b95ba63458040a236a51ba545237152b32bd05caeb6"}}