{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1997:JLTS4OLSEZTWMHL76IUK4XMNKS","short_pith_number":"pith:JLTS4OLS","canonical_record":{"source":{"id":"astro-ph/9704109","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1997-04-12T01:21:50Z","cross_cats_sorted":[],"title_canon_sha256":"d61e11a34ce15770b168d4cab5c7cafe8d15fcc669f1725030472e58a34ca070","abstract_canon_sha256":"ccb098b2b314d0cc4a4fd91319fde65bed44a5c0e4011fd2aea6726975bbe102"},"schema_version":"1.0"},"canonical_sha256":"4ae72e39722667661d7ff228ae5d8d548f966010679d9b81cf8eb2054668e312","source":{"kind":"arxiv","id":"astro-ph/9704109","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9704109","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9704109v2","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9704109","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"pith_short_12","alias_value":"JLTS4OLSEZTW","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"pith_short_16","alias_value":"JLTS4OLSEZTWMHL7","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"pith_short_8","alias_value":"JLTS4OLS","created_at":"2026-07-04T16:02:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1997:JLTS4OLSEZTWMHL76IUK4XMNKS","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/9704109","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"1997-04-12T01:21:50Z","cross_cats_sorted":[],"title_canon_sha256":"d61e11a34ce15770b168d4cab5c7cafe8d15fcc669f1725030472e58a34ca070","abstract_canon_sha256":"ccb098b2b314d0cc4a4fd91319fde65bed44a5c0e4011fd2aea6726975bbe102"},"schema_version":"1.0"},"canonical_sha256":"4ae72e39722667661d7ff228ae5d8d548f966010679d9b81cf8eb2054668e312","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:02:57.718347Z","signature_b64":"+jZn2oCdaaw1mHEmFp/H901klolv/P7so3pt/FG8TdYBAZ/G8ZJRwCr5383QWbJIEoesmJmrZ+8IpQU70e7TDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4ae72e39722667661d7ff228ae5d8d548f966010679d9b81cf8eb2054668e312","last_reissued_at":"2026-07-04T16:02:57.717769Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:02:57.717769Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/9704109","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":"2026-07-04T16:02:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"grEG7c47cQoWi5DX8pVGZpvxMgw9/c9OEu3OF6PlkZXnywg+Fwkt0A1EMMk85+u3v8ujXHqNpKEHWHEQpVFECw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T12:13:09.166557Z"},"content_sha256":"0ea944f9e3cef0ab89f998657ef527602bf612598b108320f32afb04bc92513e","schema_version":"1.0","event_id":"sha256:0ea944f9e3cef0ab89f998657ef527602bf612598b108320f32afb04bc92513e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1997:JLTS4OLSEZTWMHL76IUK4XMNKS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Keck Spectroscopy of the Gravitational Lens System PG 1115+080: Redshifts of the Lensing Galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Judith G. Cohen, Lori M. Lubin (OCIW), Roger D. Blandford (Caltech), Tomislav Kundic","submitted_at":"1997-04-12T01:21:50Z","abstract_excerpt":"The quadruple system PG 1115+080 is the second gravitational lens with a reported measurement of the Hubble constant. In addition to the primary lens, three nearby galaxies are believed to contribute significantly to the lensing potential. In this paper we report accurate redshifts for all four galaxies and show that they belong to a single group at z_d = 0.311. This group has very similar properties to Hickson's compact groups of galaxies found at lower redshifts. We briefly discuss implications for the existing lens models and derive H_0 = 52 +/- 14 km/s/Mpc."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9704109","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9704109/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":"2026-07-04T16:02:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GIfbNA7cTylkLB4udOQwSkzsDot7xk8WSKP8VT9Y1tTdLAk1OmYGLXKt9YtVjuLC4La4OBI1fAuiWmMpCN+UCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T12:13:09.167065Z"},"content_sha256":"fb9b27ad7e669585cc70f764ab846d8007f2789d4f3d3b68f715cc505ac1d9d8","schema_version":"1.0","event_id":"sha256:fb9b27ad7e669585cc70f764ab846d8007f2789d4f3d3b68f715cc505ac1d9d8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JLTS4OLSEZTWMHL76IUK4XMNKS/bundle.json","state_url":"https://pith.science/pith/JLTS4OLSEZTWMHL76IUK4XMNKS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JLTS4OLSEZTWMHL76IUK4XMNKS/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":"2026-08-14T12:13:09Z","links":{"resolver":"https://pith.science/pith/JLTS4OLSEZTWMHL76IUK4XMNKS","bundle":"https://pith.science/pith/JLTS4OLSEZTWMHL76IUK4XMNKS/bundle.json","state":"https://pith.science/pith/JLTS4OLSEZTWMHL76IUK4XMNKS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JLTS4OLSEZTWMHL76IUK4XMNKS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1997:JLTS4OLSEZTWMHL76IUK4XMNKS","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":"ccb098b2b314d0cc4a4fd91319fde65bed44a5c0e4011fd2aea6726975bbe102","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1997-04-12T01:21:50Z","title_canon_sha256":"d61e11a34ce15770b168d4cab5c7cafe8d15fcc669f1725030472e58a34ca070"},"schema_version":"1.0","source":{"id":"astro-ph/9704109","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9704109","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9704109v2","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9704109","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"pith_short_12","alias_value":"JLTS4OLSEZTW","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"pith_short_16","alias_value":"JLTS4OLSEZTWMHL7","created_at":"2026-07-04T16:02:57Z"},{"alias_kind":"pith_short_8","alias_value":"JLTS4OLS","created_at":"2026-07-04T16:02:57Z"}],"graph_snapshots":[{"event_id":"sha256:fb9b27ad7e669585cc70f764ab846d8007f2789d4f3d3b68f715cc505ac1d9d8","target":"graph","created_at":"2026-07-04T16:02:57Z","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/astro-ph/9704109/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The quadruple system PG 1115+080 is the second gravitational lens with a reported measurement of the Hubble constant. In addition to the primary lens, three nearby galaxies are believed to contribute significantly to the lensing potential. In this paper we report accurate redshifts for all four galaxies and show that they belong to a single group at z_d = 0.311. This group has very similar properties to Hickson's compact groups of galaxies found at lower redshifts. We briefly discuss implications for the existing lens models and derive H_0 = 52 +/- 14 km/s/Mpc.","authors_text":"Judith G. Cohen, Lori M. Lubin (OCIW), Roger D. Blandford (Caltech), Tomislav Kundic","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1997-04-12T01:21:50Z","title":"Keck Spectroscopy of the Gravitational Lens System PG 1115+080: Redshifts of the Lensing Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9704109","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":"sha256:0ea944f9e3cef0ab89f998657ef527602bf612598b108320f32afb04bc92513e","target":"record","created_at":"2026-07-04T16:02:57Z","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":"ccb098b2b314d0cc4a4fd91319fde65bed44a5c0e4011fd2aea6726975bbe102","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1997-04-12T01:21:50Z","title_canon_sha256":"d61e11a34ce15770b168d4cab5c7cafe8d15fcc669f1725030472e58a34ca070"},"schema_version":"1.0","source":{"id":"astro-ph/9704109","kind":"arxiv","version":2}},"canonical_sha256":"4ae72e39722667661d7ff228ae5d8d548f966010679d9b81cf8eb2054668e312","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4ae72e39722667661d7ff228ae5d8d548f966010679d9b81cf8eb2054668e312","first_computed_at":"2026-07-04T16:02:57.717769Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:02:57.717769Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+jZn2oCdaaw1mHEmFp/H901klolv/P7so3pt/FG8TdYBAZ/G8ZJRwCr5383QWbJIEoesmJmrZ+8IpQU70e7TDQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:02:57.718347Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9704109","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0ea944f9e3cef0ab89f998657ef527602bf612598b108320f32afb04bc92513e","sha256:fb9b27ad7e669585cc70f764ab846d8007f2789d4f3d3b68f715cc505ac1d9d8"],"state_sha256":"3e44fed788422305121464fe9bb3c790146cbeb54e3e7ba92d0efa1e95847f07"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"U40EGWmRTQfrBTK75+HC38YnjeQ6xV6w+/EqQ6aWctH8GIOO54hMbR+i1NuDIU1uqXZMcxQ5zr6diu3DZI15Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T12:13:09.171162Z","bundle_sha256":"a158845036017f384232a749b87e81c9e25b1cce3281152fe0dcccbd16332ad9"}}