{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:R6QQ65U2JQNMF34OEAEGXR7MHS","short_pith_number":"pith:R6QQ65U2","canonical_record":{"source":{"id":"1905.06816","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-16T14:57:18Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"7d3dc000992ad6e7cfdce1b9b80ab317c9e8f0968186d734e06266ca4c5bebdb","abstract_canon_sha256":"6c03ce6f92934a7c2c5b0141b1d6a67d0022195d0d5f32a88a41d9e48c6d85d1"},"schema_version":"1.0"},"canonical_sha256":"8fa10f769a4c1ac2ef8e20086bc7ec3c803e551b64d286c1911665da29597562","source":{"kind":"arxiv","id":"1905.06816","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.06816","created_at":"2026-05-17T23:42:18Z"},{"alias_kind":"arxiv_version","alias_value":"1905.06816v3","created_at":"2026-05-17T23:42:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.06816","created_at":"2026-05-17T23:42:18Z"},{"alias_kind":"pith_short_12","alias_value":"R6QQ65U2JQNM","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"R6QQ65U2JQNMF34O","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"R6QQ65U2","created_at":"2026-05-18T12:33:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:R6QQ65U2JQNMF34OEAEGXR7MHS","target":"record","payload":{"canonical_record":{"source":{"id":"1905.06816","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-16T14:57:18Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"7d3dc000992ad6e7cfdce1b9b80ab317c9e8f0968186d734e06266ca4c5bebdb","abstract_canon_sha256":"6c03ce6f92934a7c2c5b0141b1d6a67d0022195d0d5f32a88a41d9e48c6d85d1"},"schema_version":"1.0"},"canonical_sha256":"8fa10f769a4c1ac2ef8e20086bc7ec3c803e551b64d286c1911665da29597562","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:42:18.958538Z","signature_b64":"LD9DXEJ88Y6BSs6d93aBVDDj5U+teYWaJFkrHpNiZlbT0HHvCIfkVG+sQJ50qSUBBFlqqTtw1RzakWVED/pbDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8fa10f769a4c1ac2ef8e20086bc7ec3c803e551b64d286c1911665da29597562","last_reissued_at":"2026-05-17T23:42:18.957874Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:42:18.957874Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1905.06816","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:42:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5fKII1HTqPrROGDJEbNxY7WfYFNbsgLcYZDKPms0vbodka71FAhzfVAoedBNWmNSsBuc0izojLWByc/O/gk4Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T02:28:41.183337Z"},"content_sha256":"b57bcc07441754dd39289fc4b068535ccd14c8b3e2083c9a6f2ecef6ceb79add","schema_version":"1.0","event_id":"sha256:b57bcc07441754dd39289fc4b068535ccd14c8b3e2083c9a6f2ecef6ceb79add"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:R6QQ65U2JQNMF34OEAEGXR7MHS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characteristics of extensive air showers around the energy threshold for ground-particle-based gamma-ray observatories","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"Harm Schoorlemmer, Jim Hinton, Rub\\'en L\\'opez-Coto","submitted_at":"2019-05-16T14:57:18Z","abstract_excerpt":"Very high energy gamma-ray astronomy based on the measurement of air shower particles at ground-level has only recently been established as a viable approach, complementing the well established air Cherenkov technique. This approach requires high (mountain) altitudes and very high surface coverage particle detectors. While in general the properties of air showers are well established for many decades, the extreme situation of ground-level detection of very small showers from low energy primaries has not yet been well characterised for the purposes of gamma-ray astronomy. Here we attempt such a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.06816","kind":"arxiv","version":3},"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":"2026-05-17T23:42:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5aUYCi9awhW4LWLhTCsqKva8ukgALBVcJ7ulcRgd83tGt/4qU8vkXGtmRs9gupY3ebJhw5aPx0a1DzoOqBfuCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T02:28:41.183917Z"},"content_sha256":"f30c5c3b0ffa7cb70bf5dda570438ff2d4141b97021e636254a3d6804cf29b61","schema_version":"1.0","event_id":"sha256:f30c5c3b0ffa7cb70bf5dda570438ff2d4141b97021e636254a3d6804cf29b61"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/R6QQ65U2JQNMF34OEAEGXR7MHS/bundle.json","state_url":"https://pith.science/pith/R6QQ65U2JQNMF34OEAEGXR7MHS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/R6QQ65U2JQNMF34OEAEGXR7MHS/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":"2026-06-05T02:28:41Z","links":{"resolver":"https://pith.science/pith/R6QQ65U2JQNMF34OEAEGXR7MHS","bundle":"https://pith.science/pith/R6QQ65U2JQNMF34OEAEGXR7MHS/bundle.json","state":"https://pith.science/pith/R6QQ65U2JQNMF34OEAEGXR7MHS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/R6QQ65U2JQNMF34OEAEGXR7MHS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:R6QQ65U2JQNMF34OEAEGXR7MHS","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":"6c03ce6f92934a7c2c5b0141b1d6a67d0022195d0d5f32a88a41d9e48c6d85d1","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-16T14:57:18Z","title_canon_sha256":"7d3dc000992ad6e7cfdce1b9b80ab317c9e8f0968186d734e06266ca4c5bebdb"},"schema_version":"1.0","source":{"id":"1905.06816","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.06816","created_at":"2026-05-17T23:42:18Z"},{"alias_kind":"arxiv_version","alias_value":"1905.06816v3","created_at":"2026-05-17T23:42:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.06816","created_at":"2026-05-17T23:42:18Z"},{"alias_kind":"pith_short_12","alias_value":"R6QQ65U2JQNM","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_16","alias_value":"R6QQ65U2JQNMF34O","created_at":"2026-05-18T12:33:27Z"},{"alias_kind":"pith_short_8","alias_value":"R6QQ65U2","created_at":"2026-05-18T12:33:27Z"}],"graph_snapshots":[{"event_id":"sha256:f30c5c3b0ffa7cb70bf5dda570438ff2d4141b97021e636254a3d6804cf29b61","target":"graph","created_at":"2026-05-17T23:42:18Z","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":"Very high energy gamma-ray astronomy based on the measurement of air shower particles at ground-level has only recently been established as a viable approach, complementing the well established air Cherenkov technique. This approach requires high (mountain) altitudes and very high surface coverage particle detectors. While in general the properties of air showers are well established for many decades, the extreme situation of ground-level detection of very small showers from low energy primaries has not yet been well characterised for the purposes of gamma-ray astronomy. Here we attempt such a","authors_text":"Harm Schoorlemmer, Jim Hinton, Rub\\'en L\\'opez-Coto","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-16T14:57:18Z","title":"Characteristics of extensive air showers around the energy threshold for ground-particle-based gamma-ray observatories"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.06816","kind":"arxiv","version":3},"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:b57bcc07441754dd39289fc4b068535ccd14c8b3e2083c9a6f2ecef6ceb79add","target":"record","created_at":"2026-05-17T23:42:18Z","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":"6c03ce6f92934a7c2c5b0141b1d6a67d0022195d0d5f32a88a41d9e48c6d85d1","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-05-16T14:57:18Z","title_canon_sha256":"7d3dc000992ad6e7cfdce1b9b80ab317c9e8f0968186d734e06266ca4c5bebdb"},"schema_version":"1.0","source":{"id":"1905.06816","kind":"arxiv","version":3}},"canonical_sha256":"8fa10f769a4c1ac2ef8e20086bc7ec3c803e551b64d286c1911665da29597562","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8fa10f769a4c1ac2ef8e20086bc7ec3c803e551b64d286c1911665da29597562","first_computed_at":"2026-05-17T23:42:18.957874Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:42:18.957874Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LD9DXEJ88Y6BSs6d93aBVDDj5U+teYWaJFkrHpNiZlbT0HHvCIfkVG+sQJ50qSUBBFlqqTtw1RzakWVED/pbDQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:42:18.958538Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.06816","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b57bcc07441754dd39289fc4b068535ccd14c8b3e2083c9a6f2ecef6ceb79add","sha256:f30c5c3b0ffa7cb70bf5dda570438ff2d4141b97021e636254a3d6804cf29b61"],"state_sha256":"0d403202e065316f1f4ac4b57a9d6ddcbb70a6929fa1974158f9c33c65f681e8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ycw1GZCyBf9p5lgb6C/zmcMfizJ3o3FgsC8sQqpeBeFqNVWdJcMgmCI3RyABDx+KNifgZENemJy3By6jsCs1BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T02:28:41.186831Z","bundle_sha256":"72a752670f52e351bb2337767a484d1e13e76f9e5386c7be8be7629ff7cc4c8e"}}