{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:RHBGOELBHG227TLIOS72TVOOJ7","short_pith_number":"pith:RHBGOELB","canonical_record":{"source":{"id":"2108.09312","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-20T18:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"37a32178bff4783b7f3ca3b2a030dcc63af1637c3302375dd5ea02c43015bcb7","abstract_canon_sha256":"5f0881ce5663dc434eb408dea2cf0efa18114cd127a8a8dab7446b86e337bd03"},"schema_version":"1.0"},"canonical_sha256":"89c267116139b5afcd6874bfa9d5ce4fc348f96450b707791ed547c65bc63aa9","source":{"kind":"arxiv","id":"2108.09312","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.09312","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"arxiv_version","alias_value":"2108.09312v1","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.09312","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"pith_short_12","alias_value":"RHBGOELBHG22","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"pith_short_16","alias_value":"RHBGOELBHG227TLI","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"pith_short_8","alias_value":"RHBGOELB","created_at":"2026-07-05T03:59:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:RHBGOELBHG227TLIOS72TVOOJ7","target":"record","payload":{"canonical_record":{"source":{"id":"2108.09312","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-20T18:00:01Z","cross_cats_sorted":[],"title_canon_sha256":"37a32178bff4783b7f3ca3b2a030dcc63af1637c3302375dd5ea02c43015bcb7","abstract_canon_sha256":"5f0881ce5663dc434eb408dea2cf0efa18114cd127a8a8dab7446b86e337bd03"},"schema_version":"1.0"},"canonical_sha256":"89c267116139b5afcd6874bfa9d5ce4fc348f96450b707791ed547c65bc63aa9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:59:17.382830Z","signature_b64":"Ca82Se4hYmkJ1J4Obht22nsnuGucNfnZrLQ57ckXNbcFO2ATru81PbumE9lLmPO+Cm42g3RZJqxdm5nlCdZBCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"89c267116139b5afcd6874bfa9d5ce4fc348f96450b707791ed547c65bc63aa9","last_reissued_at":"2026-07-05T03:59:17.382341Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:59:17.382341Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.09312","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":"2026-07-05T03:59:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VqrjNUgaED3Uw54J2rY8eUYn/7oCGbr8Ic2VbzJro0CfoVxg0BAnqJJrIVMLt81ZJOCF4Hm/MzjONB9oY+18Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T20:17:45.203117Z"},"content_sha256":"cc826955e029ea3c5d6dbe590e1fc2fe866aec8f9e4d808328815d431170a752","schema_version":"1.0","event_id":"sha256:cc826955e029ea3c5d6dbe590e1fc2fe866aec8f9e4d808328815d431170a752"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:RHBGOELBHG227TLIOS72TVOOJ7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hubble Space Telescope Observations of NGC 253 Dwarf Satellites: Discovery of Three Ultra-faint Dwarf Galaxies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Anil C. Seth, Bur\\c{c}in Mutlu-Pakdil, David J. Sand, Denija Crnojevi\\'c, Elisa Toloba, Jay Strader, Joshua D. Simon, Kristine Spekkens, Michael G. Jones, Nelson Caldwell, Puragra Guhathakurta","submitted_at":"2021-08-20T18:00:01Z","abstract_excerpt":"We present deep Hubble Space Telescope imaging of five faint dwarf galaxies associated with the nearby spiral NGC 253 (D$\\approx$3.5 Mpc). Three of these are newly discovered ultra-faint dwarf galaxies, while all five were found in the Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS), a Magellan$+$Megacam survey to identify faint dwarfs and other substructures in resolved stellar light around massive galaxies outside of the Local Group. Our HST data reach $\\gtrsim$3 magnitudes below the tip of the red giant branch for each dwarf, allowing us to derive their distances, structural par"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.09312","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/2108.09312/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":"2026-07-05T03:59:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y7Q+Ivn8IzBb36b7ek3VoLX7EwJSiJSYLuvT+xKVNLGRJAZ6B6B8oa84q7sO6xq54dkFlyF9K35E+/Icpr6OAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T20:17:45.204070Z"},"content_sha256":"1f2186e1f5c855dbdc9d40569802e208255111046481bacb3412e5c19abd0ecd","schema_version":"1.0","event_id":"sha256:1f2186e1f5c855dbdc9d40569802e208255111046481bacb3412e5c19abd0ecd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RHBGOELBHG227TLIOS72TVOOJ7/bundle.json","state_url":"https://pith.science/pith/RHBGOELBHG227TLIOS72TVOOJ7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RHBGOELBHG227TLIOS72TVOOJ7/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":"2026-08-04T20:17:45Z","links":{"resolver":"https://pith.science/pith/RHBGOELBHG227TLIOS72TVOOJ7","bundle":"https://pith.science/pith/RHBGOELBHG227TLIOS72TVOOJ7/bundle.json","state":"https://pith.science/pith/RHBGOELBHG227TLIOS72TVOOJ7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RHBGOELBHG227TLIOS72TVOOJ7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:RHBGOELBHG227TLIOS72TVOOJ7","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":"5f0881ce5663dc434eb408dea2cf0efa18114cd127a8a8dab7446b86e337bd03","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-20T18:00:01Z","title_canon_sha256":"37a32178bff4783b7f3ca3b2a030dcc63af1637c3302375dd5ea02c43015bcb7"},"schema_version":"1.0","source":{"id":"2108.09312","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.09312","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"arxiv_version","alias_value":"2108.09312v1","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.09312","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"pith_short_12","alias_value":"RHBGOELBHG22","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"pith_short_16","alias_value":"RHBGOELBHG227TLI","created_at":"2026-07-05T03:59:17Z"},{"alias_kind":"pith_short_8","alias_value":"RHBGOELB","created_at":"2026-07-05T03:59:17Z"}],"graph_snapshots":[{"event_id":"sha256:1f2186e1f5c855dbdc9d40569802e208255111046481bacb3412e5c19abd0ecd","target":"graph","created_at":"2026-07-05T03:59:17Z","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/2108.09312/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present deep Hubble Space Telescope imaging of five faint dwarf galaxies associated with the nearby spiral NGC 253 (D$\\approx$3.5 Mpc). Three of these are newly discovered ultra-faint dwarf galaxies, while all five were found in the Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS), a Magellan$+$Megacam survey to identify faint dwarfs and other substructures in resolved stellar light around massive galaxies outside of the Local Group. Our HST data reach $\\gtrsim$3 magnitudes below the tip of the red giant branch for each dwarf, allowing us to derive their distances, structural par","authors_text":"Anil C. Seth, Bur\\c{c}in Mutlu-Pakdil, David J. Sand, Denija Crnojevi\\'c, Elisa Toloba, Jay Strader, Joshua D. Simon, Kristine Spekkens, Michael G. Jones, Nelson Caldwell, Puragra Guhathakurta","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-20T18:00:01Z","title":"Hubble Space Telescope Observations of NGC 253 Dwarf Satellites: Discovery of Three Ultra-faint Dwarf Galaxies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.09312","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:cc826955e029ea3c5d6dbe590e1fc2fe866aec8f9e4d808328815d431170a752","target":"record","created_at":"2026-07-05T03:59:17Z","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":"5f0881ce5663dc434eb408dea2cf0efa18114cd127a8a8dab7446b86e337bd03","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2021-08-20T18:00:01Z","title_canon_sha256":"37a32178bff4783b7f3ca3b2a030dcc63af1637c3302375dd5ea02c43015bcb7"},"schema_version":"1.0","source":{"id":"2108.09312","kind":"arxiv","version":1}},"canonical_sha256":"89c267116139b5afcd6874bfa9d5ce4fc348f96450b707791ed547c65bc63aa9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"89c267116139b5afcd6874bfa9d5ce4fc348f96450b707791ed547c65bc63aa9","first_computed_at":"2026-07-05T03:59:17.382341Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:59:17.382341Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ca82Se4hYmkJ1J4Obht22nsnuGucNfnZrLQ57ckXNbcFO2ATru81PbumE9lLmPO+Cm42g3RZJqxdm5nlCdZBCw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:59:17.382830Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.09312","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc826955e029ea3c5d6dbe590e1fc2fe866aec8f9e4d808328815d431170a752","sha256:1f2186e1f5c855dbdc9d40569802e208255111046481bacb3412e5c19abd0ecd"],"state_sha256":"138a1ffe4bd62431bd03dab2f94a5388cb1e688599cbf5c3c62885401a804a9b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"28Qq72Q3pJzYMBWZqV3LI0akKXwGSsMrBzShZVSY50PWfbKStaLNONX6TeAhT8ipjtb2e6IW7Plk9wmx+0reDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T20:17:45.211251Z","bundle_sha256":"7191b9cb1d2959fffbd3edaea6c577a67fa0e0e2719d850f6fef26e6382f80f1"}}