{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:V6PPQOLF3NVWQ2VO4JXFU5V5ZT","short_pith_number":"pith:V6PPQOLF","canonical_record":{"source":{"id":"1107.2668","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-13T20:31:32Z","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"title_canon_sha256":"12506e67d37c502ecfd95c605c786e5a548c5985fa7dd78bbdc97815502da3c1","abstract_canon_sha256":"082bed17601f963822aad777adf1ef0a62411061408ea5114d16202b2404bda7"},"schema_version":"1.0"},"canonical_sha256":"af9ef83965db6b686aaee26e5a76bdccd13bf7dcbf94b18266db7662df725134","source":{"kind":"arxiv","id":"1107.2668","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2668","created_at":"2026-05-18T04:18:15Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2668v1","created_at":"2026-05-18T04:18:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2668","created_at":"2026-05-18T04:18:15Z"},{"alias_kind":"pith_short_12","alias_value":"V6PPQOLF3NVW","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_16","alias_value":"V6PPQOLF3NVWQ2VO","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_8","alias_value":"V6PPQOLF","created_at":"2026-05-18T12:26:42Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:V6PPQOLF3NVWQ2VO4JXFU5V5ZT","target":"record","payload":{"canonical_record":{"source":{"id":"1107.2668","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-13T20:31:32Z","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"title_canon_sha256":"12506e67d37c502ecfd95c605c786e5a548c5985fa7dd78bbdc97815502da3c1","abstract_canon_sha256":"082bed17601f963822aad777adf1ef0a62411061408ea5114d16202b2404bda7"},"schema_version":"1.0"},"canonical_sha256":"af9ef83965db6b686aaee26e5a76bdccd13bf7dcbf94b18266db7662df725134","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:18:15.869951Z","signature_b64":"/Im/Fc0/gQotlitcjZl+dAELt45Aln2pF+g4OJ8V0Dv1SV9r6QrF9e3vS96SKh/JGnqWFMB61jHAZon7Rt93DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"af9ef83965db6b686aaee26e5a76bdccd13bf7dcbf94b18266db7662df725134","last_reissued_at":"2026-05-18T04:18:15.869549Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:18:15.869549Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1107.2668","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":"2026-05-18T04:18:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VOjyp4jJ07Mo1R9fDb22aYh6EI/gnIqv3JBOykQ1CNslxY/dcWLSdLdKN+L1O9MpcBem3icx1jlgmwLt6t2zBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T14:56:12.514572Z"},"content_sha256":"e8eee8272751b3e30b416e34e7aa278d4dd6a41f2a9c6eb934ec0fca970684bf","schema_version":"1.0","event_id":"sha256:e8eee8272751b3e30b416e34e7aa278d4dd6a41f2a9c6eb934ec0fca970684bf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:V6PPQOLF3NVWQ2VO4JXFU5V5ZT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Stellar Clusters in M31 from PHAT: Survey Overview and First Results","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.SR"],"primary_cat":"astro-ph.CO","authors_text":"(2) Harvard-Smithsonian CfA, (3) MPIA, (4) University of Utrecht, (5) NOAO, (6) University of Florida), Anil C. Seth (2), Ata Sarajedini (6), Daniel R. Weisz (1), Dimitrios A. Gouliermis (3), Izaskun San Roman (6), Julianne J. Dalcanton (1), Knut A. G. Olsen (5), L. Clifton Johnson (1), Nelson Caldwell (2), Paul W. Hodge (1), Soeren S. Larsen (4), the PHAT Collaboration ((1) University of Washington","submitted_at":"2011-07-13T20:31:32Z","abstract_excerpt":"The Panchromatic Hubble Andromeda Treasury (PHAT) is an on-going Hubble Space Telescope (HST) multi-cycle program that will image one-third of the M31 disk at high resolution, with wavelength coverage from the ultraviolet through the near-infrared. This dataset will allow for the construction of the most complete catalog of stellar clusters obtained for a spiral galaxy. Here, we provide an overview of the PHAT survey, a progress report on the status of observations and analysis, and preliminary results from the PHAT cluster program. Although only ~20% of the survey is complete, the superior re"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2668","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":"2026-05-18T04:18:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vrhxrHLgYgsj5Iio2ATk0Jm3wv5ataBtm+foIUpPrkbjlaRmFVjGdLM7CSRQ6Oy78p524xsuGGlWDZogPqUABA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T14:56:12.514923Z"},"content_sha256":"c58a088c81fa7e8923b6c1d27dd70b92442cd7908a5757d41cb543d8309333be","schema_version":"1.0","event_id":"sha256:c58a088c81fa7e8923b6c1d27dd70b92442cd7908a5757d41cb543d8309333be"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V6PPQOLF3NVWQ2VO4JXFU5V5ZT/bundle.json","state_url":"https://pith.science/pith/V6PPQOLF3NVWQ2VO4JXFU5V5ZT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V6PPQOLF3NVWQ2VO4JXFU5V5ZT/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":"2026-06-01T14:56:12Z","links":{"resolver":"https://pith.science/pith/V6PPQOLF3NVWQ2VO4JXFU5V5ZT","bundle":"https://pith.science/pith/V6PPQOLF3NVWQ2VO4JXFU5V5ZT/bundle.json","state":"https://pith.science/pith/V6PPQOLF3NVWQ2VO4JXFU5V5ZT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V6PPQOLF3NVWQ2VO4JXFU5V5ZT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:V6PPQOLF3NVWQ2VO4JXFU5V5ZT","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":"082bed17601f963822aad777adf1ef0a62411061408ea5114d16202b2404bda7","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-13T20:31:32Z","title_canon_sha256":"12506e67d37c502ecfd95c605c786e5a548c5985fa7dd78bbdc97815502da3c1"},"schema_version":"1.0","source":{"id":"1107.2668","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1107.2668","created_at":"2026-05-18T04:18:15Z"},{"alias_kind":"arxiv_version","alias_value":"1107.2668v1","created_at":"2026-05-18T04:18:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1107.2668","created_at":"2026-05-18T04:18:15Z"},{"alias_kind":"pith_short_12","alias_value":"V6PPQOLF3NVW","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_16","alias_value":"V6PPQOLF3NVWQ2VO","created_at":"2026-05-18T12:26:42Z"},{"alias_kind":"pith_short_8","alias_value":"V6PPQOLF","created_at":"2026-05-18T12:26:42Z"}],"graph_snapshots":[{"event_id":"sha256:c58a088c81fa7e8923b6c1d27dd70b92442cd7908a5757d41cb543d8309333be","target":"graph","created_at":"2026-05-18T04:18:15Z","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":"The Panchromatic Hubble Andromeda Treasury (PHAT) is an on-going Hubble Space Telescope (HST) multi-cycle program that will image one-third of the M31 disk at high resolution, with wavelength coverage from the ultraviolet through the near-infrared. This dataset will allow for the construction of the most complete catalog of stellar clusters obtained for a spiral galaxy. Here, we provide an overview of the PHAT survey, a progress report on the status of observations and analysis, and preliminary results from the PHAT cluster program. Although only ~20% of the survey is complete, the superior re","authors_text":"(2) Harvard-Smithsonian CfA, (3) MPIA, (4) University of Utrecht, (5) NOAO, (6) University of Florida), Anil C. Seth (2), Ata Sarajedini (6), Daniel R. Weisz (1), Dimitrios A. Gouliermis (3), Izaskun San Roman (6), Julianne J. Dalcanton (1), Knut A. G. Olsen (5), L. Clifton Johnson (1), Nelson Caldwell (2), Paul W. Hodge (1), Soeren S. Larsen (4), the PHAT Collaboration ((1) University of Washington","cross_cats":["astro-ph.GA","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-13T20:31:32Z","title":"Stellar Clusters in M31 from PHAT: Survey Overview and First Results"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1107.2668","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:e8eee8272751b3e30b416e34e7aa278d4dd6a41f2a9c6eb934ec0fca970684bf","target":"record","created_at":"2026-05-18T04:18:15Z","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":"082bed17601f963822aad777adf1ef0a62411061408ea5114d16202b2404bda7","cross_cats_sorted":["astro-ph.GA","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-07-13T20:31:32Z","title_canon_sha256":"12506e67d37c502ecfd95c605c786e5a548c5985fa7dd78bbdc97815502da3c1"},"schema_version":"1.0","source":{"id":"1107.2668","kind":"arxiv","version":1}},"canonical_sha256":"af9ef83965db6b686aaee26e5a76bdccd13bf7dcbf94b18266db7662df725134","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"af9ef83965db6b686aaee26e5a76bdccd13bf7dcbf94b18266db7662df725134","first_computed_at":"2026-05-18T04:18:15.869549Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:18:15.869549Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/Im/Fc0/gQotlitcjZl+dAELt45Aln2pF+g4OJ8V0Dv1SV9r6QrF9e3vS96SKh/JGnqWFMB61jHAZon7Rt93DA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:18:15.869951Z","signed_message":"canonical_sha256_bytes"},"source_id":"1107.2668","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e8eee8272751b3e30b416e34e7aa278d4dd6a41f2a9c6eb934ec0fca970684bf","sha256:c58a088c81fa7e8923b6c1d27dd70b92442cd7908a5757d41cb543d8309333be"],"state_sha256":"7f5e5bcb6d257a0597a48d540ff56668c8f0a1fbe2a8b628a850e64141ac3efb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xOMDO9h+BEieZlSn53cD+VxQTDBGnJQhpAMHEzBVR79bUx1aGaCAPwT4nC2MXNL4Ojm0humZENiPkzi7NSNvDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T14:56:12.516797Z","bundle_sha256":"5019ac41ef81926c9e65d7e603add70442f1f45335b62adea3306fc9515403b5"}}