{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:VXQIF7XQZMEJTAZSRQ2ZPXTTQB","short_pith_number":"pith:VXQIF7XQ","canonical_record":{"source":{"id":"0803.0740","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-05T20:03:52Z","cross_cats_sorted":[],"title_canon_sha256":"dfcceb17d9eb982f642d119ff513352daedfd49239066067bbe2385d7f5015b6","abstract_canon_sha256":"488d4dc520ab0e18d455ad0e66a61c1cca1247a6fe443da579cd6f4843ff0769"},"schema_version":"1.0"},"canonical_sha256":"ade082fef0cb089983328c3597de73806f79cbdcdf8b09c85003dea70602a1a0","source":{"kind":"arxiv","id":"0803.0740","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0803.0740","created_at":"2026-05-18T02:16:00Z"},{"alias_kind":"arxiv_version","alias_value":"0803.0740v1","created_at":"2026-05-18T02:16:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0803.0740","created_at":"2026-05-18T02:16:00Z"},{"alias_kind":"pith_short_12","alias_value":"VXQIF7XQZMEJ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"VXQIF7XQZMEJTAZS","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"VXQIF7XQ","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:VXQIF7XQZMEJTAZSRQ2ZPXTTQB","target":"record","payload":{"canonical_record":{"source":{"id":"0803.0740","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-05T20:03:52Z","cross_cats_sorted":[],"title_canon_sha256":"dfcceb17d9eb982f642d119ff513352daedfd49239066067bbe2385d7f5015b6","abstract_canon_sha256":"488d4dc520ab0e18d455ad0e66a61c1cca1247a6fe443da579cd6f4843ff0769"},"schema_version":"1.0"},"canonical_sha256":"ade082fef0cb089983328c3597de73806f79cbdcdf8b09c85003dea70602a1a0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:16:00.532798Z","signature_b64":"Z9mvnpeO0QdI7EW0Asx6JFl3VP3AGTNBZZoBSS8ETTYQyqvZ7iENmDGjpDILfb6+6DC8hchkwQIKcG/q0bsBAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ade082fef0cb089983328c3597de73806f79cbdcdf8b09c85003dea70602a1a0","last_reissued_at":"2026-05-18T02:16:00.532289Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:16:00.532289Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0803.0740","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":"2026-05-18T02:16:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aJ6DuBQc8K6Tfa9q5Y9Kb/zvQnZK7Vdupwqk9ell54hjGZ18/adnBf0fE/U4xyIJ9mOgnHFNJtFuCLXMKtFVBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T15:47:24.634094Z"},"content_sha256":"36fe8cca633736edae03d0818183fe5c02a378b26daa3e0d7e26e9ac530f7a2d","schema_version":"1.0","event_id":"sha256:36fe8cca633736edae03d0818183fe5c02a378b26daa3e0d7e26e9ac530f7a2d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:VXQIF7XQZMEJTAZSRQ2ZPXTTQB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Deep HST Study of the Globular Cluster NGC 6397: Reduction Methods","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Brad M. S. Hansen, Gregory G. Fahlman, Harvey B. Richer, Ivan R. King, Jarrod Hurley, Jasonjot S. Kalirai, Jay Anderson, Peter B. Stetson, R. Michael Rich","submitted_at":"2008-03-05T20:03:52Z","abstract_excerpt":"We describe here the reduction methods that we developed to study the faintest red dwarfs and white dwarfs in an outer field of NGC6397, which was observed by \\hst for 126 orbits in 2005. The particular challenge of this data set is that the faintest stars are not readily visible in individual exposures, so special care must be taken to combine the information in all the exposures in order to identify and measure them. Unfortunately, it is hard to find the faintest stars without also finding a large number of faint galaxies, so we developed specialized tools to distinguish between the point-li"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0803.0740","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":"2026-05-18T02:16:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r+GTZfRDzvqPvZ/BJ4B7O/I3sCGX3Z1JSBP5OnDZH0jya3+qD3zJp5UwOA56QbK2szn60XPFYzPY9vUPv31cAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T15:47:24.634728Z"},"content_sha256":"02035ec012f66338925195a83275432d8d4e03f2d744bd3f85e2f8b11f10ec61","schema_version":"1.0","event_id":"sha256:02035ec012f66338925195a83275432d8d4e03f2d744bd3f85e2f8b11f10ec61"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VXQIF7XQZMEJTAZSRQ2ZPXTTQB/bundle.json","state_url":"https://pith.science/pith/VXQIF7XQZMEJTAZSRQ2ZPXTTQB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VXQIF7XQZMEJTAZSRQ2ZPXTTQB/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":"2026-05-26T15:47:24Z","links":{"resolver":"https://pith.science/pith/VXQIF7XQZMEJTAZSRQ2ZPXTTQB","bundle":"https://pith.science/pith/VXQIF7XQZMEJTAZSRQ2ZPXTTQB/bundle.json","state":"https://pith.science/pith/VXQIF7XQZMEJTAZSRQ2ZPXTTQB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VXQIF7XQZMEJTAZSRQ2ZPXTTQB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:VXQIF7XQZMEJTAZSRQ2ZPXTTQB","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":"488d4dc520ab0e18d455ad0e66a61c1cca1247a6fe443da579cd6f4843ff0769","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-05T20:03:52Z","title_canon_sha256":"dfcceb17d9eb982f642d119ff513352daedfd49239066067bbe2385d7f5015b6"},"schema_version":"1.0","source":{"id":"0803.0740","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0803.0740","created_at":"2026-05-18T02:16:00Z"},{"alias_kind":"arxiv_version","alias_value":"0803.0740v1","created_at":"2026-05-18T02:16:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0803.0740","created_at":"2026-05-18T02:16:00Z"},{"alias_kind":"pith_short_12","alias_value":"VXQIF7XQZMEJ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"VXQIF7XQZMEJTAZS","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"VXQIF7XQ","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:02035ec012f66338925195a83275432d8d4e03f2d744bd3f85e2f8b11f10ec61","target":"graph","created_at":"2026-05-18T02:16:00Z","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 describe here the reduction methods that we developed to study the faintest red dwarfs and white dwarfs in an outer field of NGC6397, which was observed by \\hst for 126 orbits in 2005. The particular challenge of this data set is that the faintest stars are not readily visible in individual exposures, so special care must be taken to combine the information in all the exposures in order to identify and measure them. Unfortunately, it is hard to find the faintest stars without also finding a large number of faint galaxies, so we developed specialized tools to distinguish between the point-li","authors_text":"Brad M. S. Hansen, Gregory G. Fahlman, Harvey B. Richer, Ivan R. King, Jarrod Hurley, Jasonjot S. Kalirai, Jay Anderson, Peter B. Stetson, R. Michael Rich","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-05T20:03:52Z","title":"A Deep HST Study of the Globular Cluster NGC 6397: Reduction Methods"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0803.0740","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":"sha256:36fe8cca633736edae03d0818183fe5c02a378b26daa3e0d7e26e9ac530f7a2d","target":"record","created_at":"2026-05-18T02:16:00Z","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":"488d4dc520ab0e18d455ad0e66a61c1cca1247a6fe443da579cd6f4843ff0769","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-03-05T20:03:52Z","title_canon_sha256":"dfcceb17d9eb982f642d119ff513352daedfd49239066067bbe2385d7f5015b6"},"schema_version":"1.0","source":{"id":"0803.0740","kind":"arxiv","version":1}},"canonical_sha256":"ade082fef0cb089983328c3597de73806f79cbdcdf8b09c85003dea70602a1a0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ade082fef0cb089983328c3597de73806f79cbdcdf8b09c85003dea70602a1a0","first_computed_at":"2026-05-18T02:16:00.532289Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:16:00.532289Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Z9mvnpeO0QdI7EW0Asx6JFl3VP3AGTNBZZoBSS8ETTYQyqvZ7iENmDGjpDILfb6+6DC8hchkwQIKcG/q0bsBAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:16:00.532798Z","signed_message":"canonical_sha256_bytes"},"source_id":"0803.0740","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:36fe8cca633736edae03d0818183fe5c02a378b26daa3e0d7e26e9ac530f7a2d","sha256:02035ec012f66338925195a83275432d8d4e03f2d744bd3f85e2f8b11f10ec61"],"state_sha256":"baad2e5f4d38f05668c62b781faa43ed2cea1278a0ca9b1ef96642187ded69e0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g5DIUi8weJouoNPVsLwVfq+Xy46BDxDo6btzIbur9DJuased0LVDjni4gPlJ+xkriTSWcRz3zuw41JcaEiL4CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T15:47:24.638101Z","bundle_sha256":"e0de9511b6ff2e39c88ec984904f4d80fc2f5f5899edce2c0abf464535101cce"}}