{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:A2FU3SCRRZG7SO3CV6SC7NTOPW","short_pith_number":"pith:A2FU3SCR","canonical_record":{"source":{"id":"1311.0393","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-02T17:02:58Z","cross_cats_sorted":[],"title_canon_sha256":"5f4d42dab0215768e867df3b6a3b30b6e8ae345a44ff4564cdcf4568480cfb53","abstract_canon_sha256":"6f8844a7cb1535d2630eb35236beba6158d3da5ec8d5ec01eab6592dc921371c"},"schema_version":"1.0"},"canonical_sha256":"068b4dc8518e4df93b62afa42fb66e7dbcbf3bf63c11227ccd9ef5d8bd0dcf29","source":{"kind":"arxiv","id":"1311.0393","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.0393","created_at":"2026-05-18T01:46:39Z"},{"alias_kind":"arxiv_version","alias_value":"1311.0393v1","created_at":"2026-05-18T01:46:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.0393","created_at":"2026-05-18T01:46:39Z"},{"alias_kind":"pith_short_12","alias_value":"A2FU3SCRRZG7","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_16","alias_value":"A2FU3SCRRZG7SO3C","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_8","alias_value":"A2FU3SCR","created_at":"2026-05-18T12:27:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:A2FU3SCRRZG7SO3CV6SC7NTOPW","target":"record","payload":{"canonical_record":{"source":{"id":"1311.0393","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-02T17:02:58Z","cross_cats_sorted":[],"title_canon_sha256":"5f4d42dab0215768e867df3b6a3b30b6e8ae345a44ff4564cdcf4568480cfb53","abstract_canon_sha256":"6f8844a7cb1535d2630eb35236beba6158d3da5ec8d5ec01eab6592dc921371c"},"schema_version":"1.0"},"canonical_sha256":"068b4dc8518e4df93b62afa42fb66e7dbcbf3bf63c11227ccd9ef5d8bd0dcf29","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:39.701594Z","signature_b64":"7YcG0OEQJC/7fxV3Gv7vVZ9sTlzx0NdRp6T5ccAGjuPvbUaWyKvNIzzGv5ckebYQ4ClHyigqg38gWcMU1dgeDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"068b4dc8518e4df93b62afa42fb66e7dbcbf3bf63c11227ccd9ef5d8bd0dcf29","last_reissued_at":"2026-05-18T01:46:39.701104Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:39.701104Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1311.0393","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":"2026-05-18T01:46:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OPlfWg9AiYISLoPkA2WqUUsGlAr9UZYAGHvw29OUWSL4iNUwTgc47lVEhohgTruBV41oBcpuVBTKaXtfCb1nCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T20:54:50.973045Z"},"content_sha256":"d8f1ac06a1c1da1c5cfb801d6c3ce1274e9853f1ae8d2d28913f4fa8567ca151","schema_version":"1.0","event_id":"sha256:d8f1ac06a1c1da1c5cfb801d6c3ce1274e9853f1ae8d2d28913f4fa8567ca151"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:A2FU3SCRRZG7SO3CV6SC7NTOPW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fermi LAT and WMAP observations of the supernova remnant HB 21","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"D.A. Smith, F. Acero, F. de Palma, F. Giordano, G.H. Janssen, G. Johannesson, G. Pivato, J. Ballet, J. Hewitt, L. Tibaldo, T.J. Brandt","submitted_at":"2013-11-02T17:02:58Z","abstract_excerpt":"We present the analysis of Fermi Large Area Telescope (LAT) $\\gamma$-ray observations of HB~21 (G89.0+4.7). We detect significant $\\gamma$-ray emission associated with the remnant: the flux >100 MeV is $9.4\\pm0.8(stat)\\pm1.6(syst)\\times10^{-11}$ erg cm$^{-2}$ s$^{-1}$. HB 21 is well modeled by a uniform disk centered at $l= 88{\\deg}.75\\pm 0{\\deg}.04$, $b = +4{\\deg}.65 \\pm 0{\\deg}.06$ with a radius of $1{\\deg}.19 \\pm 0{\\deg}.06$. The $\\gamma$-ray spectrum shows clear evidence of curvature, suggesting a cutoff or break in the underlying particle population at an energy of a few GeV. We complemen"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.0393","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":"2026-05-18T01:46:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IIQ+jY8vVOOhBVwvqy2PYkcQIe8ow2Di/oJcF596/GoF7KUuUR+vcEU1prZNTNXcxBfmx6oQAlWLv5fZ/mrfAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T20:54:50.973632Z"},"content_sha256":"5f496f6b7401e28b38447c6ff9a7ead4f1eb9caf6045fca35aab2684be58cee2","schema_version":"1.0","event_id":"sha256:5f496f6b7401e28b38447c6ff9a7ead4f1eb9caf6045fca35aab2684be58cee2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/A2FU3SCRRZG7SO3CV6SC7NTOPW/bundle.json","state_url":"https://pith.science/pith/A2FU3SCRRZG7SO3CV6SC7NTOPW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/A2FU3SCRRZG7SO3CV6SC7NTOPW/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":"2026-05-30T20:54:50Z","links":{"resolver":"https://pith.science/pith/A2FU3SCRRZG7SO3CV6SC7NTOPW","bundle":"https://pith.science/pith/A2FU3SCRRZG7SO3CV6SC7NTOPW/bundle.json","state":"https://pith.science/pith/A2FU3SCRRZG7SO3CV6SC7NTOPW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/A2FU3SCRRZG7SO3CV6SC7NTOPW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:A2FU3SCRRZG7SO3CV6SC7NTOPW","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":"6f8844a7cb1535d2630eb35236beba6158d3da5ec8d5ec01eab6592dc921371c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-02T17:02:58Z","title_canon_sha256":"5f4d42dab0215768e867df3b6a3b30b6e8ae345a44ff4564cdcf4568480cfb53"},"schema_version":"1.0","source":{"id":"1311.0393","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.0393","created_at":"2026-05-18T01:46:39Z"},{"alias_kind":"arxiv_version","alias_value":"1311.0393v1","created_at":"2026-05-18T01:46:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.0393","created_at":"2026-05-18T01:46:39Z"},{"alias_kind":"pith_short_12","alias_value":"A2FU3SCRRZG7","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_16","alias_value":"A2FU3SCRRZG7SO3C","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_8","alias_value":"A2FU3SCR","created_at":"2026-05-18T12:27:38Z"}],"graph_snapshots":[{"event_id":"sha256:5f496f6b7401e28b38447c6ff9a7ead4f1eb9caf6045fca35aab2684be58cee2","target":"graph","created_at":"2026-05-18T01:46:39Z","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 the analysis of Fermi Large Area Telescope (LAT) $\\gamma$-ray observations of HB~21 (G89.0+4.7). We detect significant $\\gamma$-ray emission associated with the remnant: the flux >100 MeV is $9.4\\pm0.8(stat)\\pm1.6(syst)\\times10^{-11}$ erg cm$^{-2}$ s$^{-1}$. HB 21 is well modeled by a uniform disk centered at $l= 88{\\deg}.75\\pm 0{\\deg}.04$, $b = +4{\\deg}.65 \\pm 0{\\deg}.06$ with a radius of $1{\\deg}.19 \\pm 0{\\deg}.06$. The $\\gamma$-ray spectrum shows clear evidence of curvature, suggesting a cutoff or break in the underlying particle population at an energy of a few GeV. We complemen","authors_text":"D.A. Smith, F. Acero, F. de Palma, F. Giordano, G.H. Janssen, G. Johannesson, G. Pivato, J. Ballet, J. Hewitt, L. Tibaldo, T.J. Brandt","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-02T17:02:58Z","title":"Fermi LAT and WMAP observations of the supernova remnant HB 21"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.0393","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:d8f1ac06a1c1da1c5cfb801d6c3ce1274e9853f1ae8d2d28913f4fa8567ca151","target":"record","created_at":"2026-05-18T01:46:39Z","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":"6f8844a7cb1535d2630eb35236beba6158d3da5ec8d5ec01eab6592dc921371c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-02T17:02:58Z","title_canon_sha256":"5f4d42dab0215768e867df3b6a3b30b6e8ae345a44ff4564cdcf4568480cfb53"},"schema_version":"1.0","source":{"id":"1311.0393","kind":"arxiv","version":1}},"canonical_sha256":"068b4dc8518e4df93b62afa42fb66e7dbcbf3bf63c11227ccd9ef5d8bd0dcf29","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"068b4dc8518e4df93b62afa42fb66e7dbcbf3bf63c11227ccd9ef5d8bd0dcf29","first_computed_at":"2026-05-18T01:46:39.701104Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:46:39.701104Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7YcG0OEQJC/7fxV3Gv7vVZ9sTlzx0NdRp6T5ccAGjuPvbUaWyKvNIzzGv5ckebYQ4ClHyigqg38gWcMU1dgeDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:46:39.701594Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.0393","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d8f1ac06a1c1da1c5cfb801d6c3ce1274e9853f1ae8d2d28913f4fa8567ca151","sha256:5f496f6b7401e28b38447c6ff9a7ead4f1eb9caf6045fca35aab2684be58cee2"],"state_sha256":"ed46b79dabea01756c19e7800db90a8e81069d9de61427e1ce6911c3ba427c2d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s6vJ68x1JZZxJUuvuQHMUBFecC9EuIXysXfcB77SUCQhKXiCou0IAPDBopSLLy35fHlnE3CzJf9ujXr4Nd/wDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T20:54:50.976682Z","bundle_sha256":"39ace38fb422cd364afb3f0fc87eee1cf5e2abb9ff3b6d27797e0b1bc0f639bd"}}