{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:JJLE6RN73HRYSGNWMAU66LGDRE","short_pith_number":"pith:JJLE6RN7","canonical_record":{"source":{"id":"1207.2057","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-09T14:17:14Z","cross_cats_sorted":[],"title_canon_sha256":"9f1af7b0fdc877f3b58be8834b7fb6cb46f924aec31a9f6415dde509dc10008a","abstract_canon_sha256":"8a05c3d451f5f35a54dc9552cf5288d76ce31f77c8fbf8246cd0e3a712e3295c"},"schema_version":"1.0"},"canonical_sha256":"4a564f45bfd9e38919b66029ef2cc3891db5077852959aa04c1b6faed9a4a151","source":{"kind":"arxiv","id":"1207.2057","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.2057","created_at":"2026-05-18T03:44:33Z"},{"alias_kind":"arxiv_version","alias_value":"1207.2057v2","created_at":"2026-05-18T03:44:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.2057","created_at":"2026-05-18T03:44:33Z"},{"alias_kind":"pith_short_12","alias_value":"JJLE6RN73HRY","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_16","alias_value":"JJLE6RN73HRYSGNW","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_8","alias_value":"JJLE6RN7","created_at":"2026-05-18T12:27:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:JJLE6RN73HRYSGNWMAU66LGDRE","target":"record","payload":{"canonical_record":{"source":{"id":"1207.2057","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-09T14:17:14Z","cross_cats_sorted":[],"title_canon_sha256":"9f1af7b0fdc877f3b58be8834b7fb6cb46f924aec31a9f6415dde509dc10008a","abstract_canon_sha256":"8a05c3d451f5f35a54dc9552cf5288d76ce31f77c8fbf8246cd0e3a712e3295c"},"schema_version":"1.0"},"canonical_sha256":"4a564f45bfd9e38919b66029ef2cc3891db5077852959aa04c1b6faed9a4a151","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:44:33.444579Z","signature_b64":"C73QgD3WJ9DYK9edfxs4n0A/BGc8SdT8CH8jYrRKR3bbkIkGVIjNOI357kAZjwUwntuYvRHfSiwb0/MMC/hJDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4a564f45bfd9e38919b66029ef2cc3891db5077852959aa04c1b6faed9a4a151","last_reissued_at":"2026-05-18T03:44:33.443789Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:44:33.443789Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1207.2057","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":"2026-05-18T03:44:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1wEs9deXJjrp/pnHQ5Rjr1fF0zx2ASBsYiFBbRkUx2oz2kSALCivo3TX/yLR0EBXKIRWtbOF8nuk9XFnbtBZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T16:52:23.941534Z"},"content_sha256":"8dded24eb795b100a7784a4e5cea6d2a871e981e46d1106523b17a0e52db1d52","schema_version":"1.0","event_id":"sha256:8dded24eb795b100a7784a4e5cea6d2a871e981e46d1106523b17a0e52db1d52"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:JJLE6RN73HRYSGNWMAU66LGDRE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An extended source of GeV gamma rays coincident with the supernova remnant HB 21","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Emma de O\\~na Wilhelmi, Ignasi Reichardt, Javier Rico, Rui-zhi Yang","submitted_at":"2012-07-09T14:17:14Z","abstract_excerpt":"We analyze 3.5 years of public Fermi/LAT data around the position of the supernova remnant HB 21, where four point-like sources from the 2nd Fermi/LAT catalog are located. We determine that the gamma-ray source is produced by a single extended source. We model the observed morphology as a uniform circle. The spectral energy distribution is best described by a curved power law, with a maximum at 413+-11 MeV. We divide the circle into three regions defined by previously identified shocked molecular clouds, and find that one of these regions has a softer spectrum. The >3 GeV gamma-ray emission of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.2057","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":"2026-05-18T03:44:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+KMENqFKpJ3f9m9j7sbUlLBuG8aoAjILqsJJS2vJ10FSjVtkcDEjYnoeVQqusB/pkaq7VVslmjYKkMf1o8sgAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T16:52:23.941879Z"},"content_sha256":"56e35b7d91edecac94cca0d76d6452d460661dd217d07656e415b82c17751e81","schema_version":"1.0","event_id":"sha256:56e35b7d91edecac94cca0d76d6452d460661dd217d07656e415b82c17751e81"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JJLE6RN73HRYSGNWMAU66LGDRE/bundle.json","state_url":"https://pith.science/pith/JJLE6RN73HRYSGNWMAU66LGDRE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JJLE6RN73HRYSGNWMAU66LGDRE/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":"2026-05-29T16:52:23Z","links":{"resolver":"https://pith.science/pith/JJLE6RN73HRYSGNWMAU66LGDRE","bundle":"https://pith.science/pith/JJLE6RN73HRYSGNWMAU66LGDRE/bundle.json","state":"https://pith.science/pith/JJLE6RN73HRYSGNWMAU66LGDRE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JJLE6RN73HRYSGNWMAU66LGDRE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:JJLE6RN73HRYSGNWMAU66LGDRE","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":"8a05c3d451f5f35a54dc9552cf5288d76ce31f77c8fbf8246cd0e3a712e3295c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-09T14:17:14Z","title_canon_sha256":"9f1af7b0fdc877f3b58be8834b7fb6cb46f924aec31a9f6415dde509dc10008a"},"schema_version":"1.0","source":{"id":"1207.2057","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1207.2057","created_at":"2026-05-18T03:44:33Z"},{"alias_kind":"arxiv_version","alias_value":"1207.2057v2","created_at":"2026-05-18T03:44:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1207.2057","created_at":"2026-05-18T03:44:33Z"},{"alias_kind":"pith_short_12","alias_value":"JJLE6RN73HRY","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_16","alias_value":"JJLE6RN73HRYSGNW","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_8","alias_value":"JJLE6RN7","created_at":"2026-05-18T12:27:11Z"}],"graph_snapshots":[{"event_id":"sha256:56e35b7d91edecac94cca0d76d6452d460661dd217d07656e415b82c17751e81","target":"graph","created_at":"2026-05-18T03:44:33Z","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 analyze 3.5 years of public Fermi/LAT data around the position of the supernova remnant HB 21, where four point-like sources from the 2nd Fermi/LAT catalog are located. We determine that the gamma-ray source is produced by a single extended source. We model the observed morphology as a uniform circle. The spectral energy distribution is best described by a curved power law, with a maximum at 413+-11 MeV. We divide the circle into three regions defined by previously identified shocked molecular clouds, and find that one of these regions has a softer spectrum. The >3 GeV gamma-ray emission of","authors_text":"Emma de O\\~na Wilhelmi, Ignasi Reichardt, Javier Rico, Rui-zhi Yang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-09T14:17:14Z","title":"An extended source of GeV gamma rays coincident with the supernova remnant HB 21"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1207.2057","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":"sha256:8dded24eb795b100a7784a4e5cea6d2a871e981e46d1106523b17a0e52db1d52","target":"record","created_at":"2026-05-18T03:44:33Z","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":"8a05c3d451f5f35a54dc9552cf5288d76ce31f77c8fbf8246cd0e3a712e3295c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-07-09T14:17:14Z","title_canon_sha256":"9f1af7b0fdc877f3b58be8834b7fb6cb46f924aec31a9f6415dde509dc10008a"},"schema_version":"1.0","source":{"id":"1207.2057","kind":"arxiv","version":2}},"canonical_sha256":"4a564f45bfd9e38919b66029ef2cc3891db5077852959aa04c1b6faed9a4a151","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4a564f45bfd9e38919b66029ef2cc3891db5077852959aa04c1b6faed9a4a151","first_computed_at":"2026-05-18T03:44:33.443789Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:44:33.443789Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C73QgD3WJ9DYK9edfxs4n0A/BGc8SdT8CH8jYrRKR3bbkIkGVIjNOI357kAZjwUwntuYvRHfSiwb0/MMC/hJDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:44:33.444579Z","signed_message":"canonical_sha256_bytes"},"source_id":"1207.2057","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8dded24eb795b100a7784a4e5cea6d2a871e981e46d1106523b17a0e52db1d52","sha256:56e35b7d91edecac94cca0d76d6452d460661dd217d07656e415b82c17751e81"],"state_sha256":"115bbca85ae0771686bb242dddd6b2b4de1b48aed7ebf16f4cee67652cd046e1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3W5S+/IEJVq9ID1sfxbSVMiR28Y6LkV2rEq1QKDgU4veTgchOz1nZZaGbyvbfsoCol8R13+rjl5h9z3gs01ODA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T16:52:23.943955Z","bundle_sha256":"7884997baba22458164aa5ba6b7bfcb0fb4e502c0a1beb4546da23b0a5503660"}}