{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:3TR3GCLNMULPBKLT5OADPTYKJZ","short_pith_number":"pith:3TR3GCLN","canonical_record":{"source":{"id":"1304.5280","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-04-18T23:26:04Z","cross_cats_sorted":[],"title_canon_sha256":"bb043810701061f689e31778726ef8ff249f39665f4a2d33a6409943b9c60712","abstract_canon_sha256":"8d385d8eb2156891deec2bd44744e01dfa30ea18a6f1aae230c108276b561c21"},"schema_version":"1.0"},"canonical_sha256":"dce3b3096d6516f0a973eb8037cf0a4e697d489b900284d39f98f4bd0050efa8","source":{"kind":"arxiv","id":"1304.5280","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.5280","created_at":"2026-05-18T01:50:30Z"},{"alias_kind":"arxiv_version","alias_value":"1304.5280v2","created_at":"2026-05-18T01:50:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.5280","created_at":"2026-05-18T01:50:30Z"},{"alias_kind":"pith_short_12","alias_value":"3TR3GCLNMULP","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"3TR3GCLNMULPBKLT","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"3TR3GCLN","created_at":"2026-05-18T12:27:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:3TR3GCLNMULPBKLT5OADPTYKJZ","target":"record","payload":{"canonical_record":{"source":{"id":"1304.5280","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-04-18T23:26:04Z","cross_cats_sorted":[],"title_canon_sha256":"bb043810701061f689e31778726ef8ff249f39665f4a2d33a6409943b9c60712","abstract_canon_sha256":"8d385d8eb2156891deec2bd44744e01dfa30ea18a6f1aae230c108276b561c21"},"schema_version":"1.0"},"canonical_sha256":"dce3b3096d6516f0a973eb8037cf0a4e697d489b900284d39f98f4bd0050efa8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:50:30.901911Z","signature_b64":"JTqUy08Y8mez9yT1e7sK6SO0BhZtgXyLFuYr+rS0VaUE5tjb89wCl+F0+8AB43rMiA+SJVvaJSFKGerYTD2vCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dce3b3096d6516f0a973eb8037cf0a4e697d489b900284d39f98f4bd0050efa8","last_reissued_at":"2026-05-18T01:50:30.901284Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:50:30.901284Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1304.5280","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":"2026-05-18T01:50:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I8NhdtNj9vn01Fr//IirqKzqXQMupKn2lbhnnW8CBWAvpcPmQtGLsYgkz3Dg48WDhuxpeTnWImKT5jXtoianCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T04:55:02.866147Z"},"content_sha256":"adb7b50ec7fe28df9a72d98cb5c6f6a025284a96437e255283415bef8dcd61b4","schema_version":"1.0","event_id":"sha256:adb7b50ec7fe28df9a72d98cb5c6f6a025284a96437e255283415bef8dcd61b4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:3TR3GCLNMULPBKLT5OADPTYKJZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Keck Observations of the Galactic Center Source G2: Gas Cloud or Star?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Boehle, A. M. Ghez, E. E. Becklin, G. Witzel, J. R. Lu, K. Matthews, K. Phifer, L. Meyer, M. R. Morris, S. Yelda, T. Do","submitted_at":"2013-04-18T23:26:04Z","abstract_excerpt":"We present new observations and analysis of G2 - the intriguing red emission-line object which is quickly approaching the Galaxy's central black hole. The observations were obtained with the laser guide star adaptive optics systems on the W. M. Keck I and II telescopes and include spectroscopy (R ~ 3600) centered on the Hydrogen Br-gamma line as well as K' (2.1 micrometer) and L' (3.8 micrometer) imaging. Analysis of these observations shows the Br-gamma line emission has a positional offset from the L' continuum. This offset is likely due to background source confusion at L'. We therefore pre"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.5280","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":""},"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":"2026-05-18T01:50:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FcQvaZs7ckqWLXD0oQk6pkeboRMyOjKRmxGpFqWSfZsgh+zEZRsTN7UXtExuCCCA1C3LS6Qn4TugRWCYUVNBBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T04:55:02.866548Z"},"content_sha256":"33e06d6e058e297718283b91cb87e9b7089e0521273312c79a89417b293294a5","schema_version":"1.0","event_id":"sha256:33e06d6e058e297718283b91cb87e9b7089e0521273312c79a89417b293294a5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3TR3GCLNMULPBKLT5OADPTYKJZ/bundle.json","state_url":"https://pith.science/pith/3TR3GCLNMULPBKLT5OADPTYKJZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3TR3GCLNMULPBKLT5OADPTYKJZ/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":"2026-05-30T04:55:02Z","links":{"resolver":"https://pith.science/pith/3TR3GCLNMULPBKLT5OADPTYKJZ","bundle":"https://pith.science/pith/3TR3GCLNMULPBKLT5OADPTYKJZ/bundle.json","state":"https://pith.science/pith/3TR3GCLNMULPBKLT5OADPTYKJZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3TR3GCLNMULPBKLT5OADPTYKJZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:3TR3GCLNMULPBKLT5OADPTYKJZ","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":"8d385d8eb2156891deec2bd44744e01dfa30ea18a6f1aae230c108276b561c21","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-04-18T23:26:04Z","title_canon_sha256":"bb043810701061f689e31778726ef8ff249f39665f4a2d33a6409943b9c60712"},"schema_version":"1.0","source":{"id":"1304.5280","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.5280","created_at":"2026-05-18T01:50:30Z"},{"alias_kind":"arxiv_version","alias_value":"1304.5280v2","created_at":"2026-05-18T01:50:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.5280","created_at":"2026-05-18T01:50:30Z"},{"alias_kind":"pith_short_12","alias_value":"3TR3GCLNMULP","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"3TR3GCLNMULPBKLT","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"3TR3GCLN","created_at":"2026-05-18T12:27:32Z"}],"graph_snapshots":[{"event_id":"sha256:33e06d6e058e297718283b91cb87e9b7089e0521273312c79a89417b293294a5","target":"graph","created_at":"2026-05-18T01:50:30Z","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 present new observations and analysis of G2 - the intriguing red emission-line object which is quickly approaching the Galaxy's central black hole. The observations were obtained with the laser guide star adaptive optics systems on the W. M. Keck I and II telescopes and include spectroscopy (R ~ 3600) centered on the Hydrogen Br-gamma line as well as K' (2.1 micrometer) and L' (3.8 micrometer) imaging. Analysis of these observations shows the Br-gamma line emission has a positional offset from the L' continuum. This offset is likely due to background source confusion at L'. We therefore pre","authors_text":"A. Boehle, A. M. Ghez, E. E. Becklin, G. Witzel, J. R. Lu, K. Matthews, K. Phifer, L. Meyer, M. R. Morris, S. Yelda, T. Do","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-04-18T23:26:04Z","title":"Keck Observations of the Galactic Center Source G2: Gas Cloud or Star?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.5280","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:adb7b50ec7fe28df9a72d98cb5c6f6a025284a96437e255283415bef8dcd61b4","target":"record","created_at":"2026-05-18T01:50:30Z","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":"8d385d8eb2156891deec2bd44744e01dfa30ea18a6f1aae230c108276b561c21","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-04-18T23:26:04Z","title_canon_sha256":"bb043810701061f689e31778726ef8ff249f39665f4a2d33a6409943b9c60712"},"schema_version":"1.0","source":{"id":"1304.5280","kind":"arxiv","version":2}},"canonical_sha256":"dce3b3096d6516f0a973eb8037cf0a4e697d489b900284d39f98f4bd0050efa8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dce3b3096d6516f0a973eb8037cf0a4e697d489b900284d39f98f4bd0050efa8","first_computed_at":"2026-05-18T01:50:30.901284Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:50:30.901284Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JTqUy08Y8mez9yT1e7sK6SO0BhZtgXyLFuYr+rS0VaUE5tjb89wCl+F0+8AB43rMiA+SJVvaJSFKGerYTD2vCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:50:30.901911Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.5280","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:adb7b50ec7fe28df9a72d98cb5c6f6a025284a96437e255283415bef8dcd61b4","sha256:33e06d6e058e297718283b91cb87e9b7089e0521273312c79a89417b293294a5"],"state_sha256":"adb2cd3c2e3bcab637b691a59ddd8134d2be6b9c018864e90c7a9859e852e2c3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HIZuCRkgsRyPgnU9xkCYtfRfWZ4TyARxyQnw84/qbpmOqIRzpgMyaRmNC7Z/M/lV6cm6vJWeuM/gWcRqoqZcDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T04:55:02.868760Z","bundle_sha256":"d2847935f7dbaf5a82780cbbf3533bc5300d3ce802232781dcfa38b9b69276aa"}}