{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:3MWJZKDWG7PTWAZ3OX7QIYV2CJ","short_pith_number":"pith:3MWJZKDW","canonical_record":{"source":{"id":"2004.02862","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-06T17:51:20Z","cross_cats_sorted":[],"title_canon_sha256":"2437854af44827ee50b6754dd5ac6d8174f8cc42523235050005b1d424aca26b","abstract_canon_sha256":"bb650fb30afcdfd82135d067635b63328298909d5f32cda193bb560e5edd6eb7"},"schema_version":"1.0"},"canonical_sha256":"db2c9ca87637df3b033b75ff0462ba1241b9c75d61f436ae7978a7df687a39c7","source":{"kind":"arxiv","id":"2004.02862","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.02862","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"arxiv_version","alias_value":"2004.02862v2","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.02862","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"pith_short_12","alias_value":"3MWJZKDWG7PT","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"pith_short_16","alias_value":"3MWJZKDWG7PTWAZ3","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"pith_short_8","alias_value":"3MWJZKDW","created_at":"2026-07-05T01:14:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:3MWJZKDWG7PTWAZ3OX7QIYV2CJ","target":"record","payload":{"canonical_record":{"source":{"id":"2004.02862","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-06T17:51:20Z","cross_cats_sorted":[],"title_canon_sha256":"2437854af44827ee50b6754dd5ac6d8174f8cc42523235050005b1d424aca26b","abstract_canon_sha256":"bb650fb30afcdfd82135d067635b63328298909d5f32cda193bb560e5edd6eb7"},"schema_version":"1.0"},"canonical_sha256":"db2c9ca87637df3b033b75ff0462ba1241b9c75d61f436ae7978a7df687a39c7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:14:45.648220Z","signature_b64":"OuuPhIN8/xzcg/svK+BHlQzGU0t3gF2JCn8s/0gq2viWJfk/IS9F2V/lHuhZLbCjEYQvy/trgfNX+bMKMj9aDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"db2c9ca87637df3b033b75ff0462ba1241b9c75d61f436ae7978a7df687a39c7","last_reissued_at":"2026-07-05T01:14:45.647753Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:14:45.647753Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2004.02862","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":"2026-07-05T01:14:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pnovqsfaWR+mIhGEUrGjJeYzMVtzM33uLBHhkrPcwLf1AXpD6WS6Pc3V/zpGgn+vtSYhlOFJMI4DmVVjpzhfDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:47:59.440815Z"},"content_sha256":"ee7d942ad43ef86fff00dde0c1512d235b045d9df33d190e2e006f273330f274","schema_version":"1.0","event_id":"sha256:ee7d942ad43ef86fff00dde0c1512d235b045d9df33d190e2e006f273330f274"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:3MWJZKDWG7PTWAZ3OX7QIYV2CJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Detection of Repeating FRB 180916.J0158+65 Down to Frequencies of 300 MHz","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Josephy, A. Naidu, B. C. Andersen, B. M. Gaensler, B. W. Meyers, C. Brar, C. G. Bassa, C. Leung, C. Ng, C. Patel, D. C. Good, D. Cubranic, D. Michilli, D. Z. Li, E. Fonseca, F. Q. Dong, H. -. H. Lin, I. H. Stairs, J. Mena-Parra, J. W. T. Hessels, K. Masui, K. M. Bandura, K. M. Smith, K. Shin, K. Vanderlinde, M. Bhardwaj, M. Dobbs, M. Merryfield, M. Rafiei-Ravandi, M. Rahman, P. Chawla, P. J. Boyle, P. Sanghavi, P. Scholz, R. Mckinven, S. P. Tendulkar, T. Cassanelli, T. L. Landecker, V. M. Kaspi, Z. Pleunis","submitted_at":"2020-04-06T17:51:20Z","abstract_excerpt":"We report on the detection of seven bursts from the periodically active, repeating fast radio burst (FRB) source FRB 180916.J0158+65 in the 300-400-MHz frequency range with the Green Bank Telescope (GBT). Emission in multiple bursts is visible down to the bottom of the GBT band, suggesting that the cutoff frequency (if it exists) for FRB emission is lower than 300 MHz. Observations were conducted during predicted periods of activity of the source, and had simultaneous coverage with the Low Frequency Array (LOFAR) and the FRB backend on the Canadian Hydrogen Intensity Mapping Experiment (CHIME)"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.02862","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2004.02862/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":"2026-07-05T01:14:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oPEtbqSzIa3zYLk9BUbHPNGjAtGAKKSoNwEcZpK3evy/vVJLBAZy/260GYArE/KI1qfPSDLMt4nWVAfJDWxDAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T14:47:59.441191Z"},"content_sha256":"2f1bb7532c6c5c0e72f1b4434283d823de19b0751459f79137418f34a9e505d3","schema_version":"1.0","event_id":"sha256:2f1bb7532c6c5c0e72f1b4434283d823de19b0751459f79137418f34a9e505d3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3MWJZKDWG7PTWAZ3OX7QIYV2CJ/bundle.json","state_url":"https://pith.science/pith/3MWJZKDWG7PTWAZ3OX7QIYV2CJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3MWJZKDWG7PTWAZ3OX7QIYV2CJ/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":"2026-07-07T14:47:59Z","links":{"resolver":"https://pith.science/pith/3MWJZKDWG7PTWAZ3OX7QIYV2CJ","bundle":"https://pith.science/pith/3MWJZKDWG7PTWAZ3OX7QIYV2CJ/bundle.json","state":"https://pith.science/pith/3MWJZKDWG7PTWAZ3OX7QIYV2CJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3MWJZKDWG7PTWAZ3OX7QIYV2CJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:3MWJZKDWG7PTWAZ3OX7QIYV2CJ","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":"bb650fb30afcdfd82135d067635b63328298909d5f32cda193bb560e5edd6eb7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-06T17:51:20Z","title_canon_sha256":"2437854af44827ee50b6754dd5ac6d8174f8cc42523235050005b1d424aca26b"},"schema_version":"1.0","source":{"id":"2004.02862","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2004.02862","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"arxiv_version","alias_value":"2004.02862v2","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2004.02862","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"pith_short_12","alias_value":"3MWJZKDWG7PT","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"pith_short_16","alias_value":"3MWJZKDWG7PTWAZ3","created_at":"2026-07-05T01:14:45Z"},{"alias_kind":"pith_short_8","alias_value":"3MWJZKDW","created_at":"2026-07-05T01:14:45Z"}],"graph_snapshots":[{"event_id":"sha256:2f1bb7532c6c5c0e72f1b4434283d823de19b0751459f79137418f34a9e505d3","target":"graph","created_at":"2026-07-05T01:14:45Z","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/2004.02862/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report on the detection of seven bursts from the periodically active, repeating fast radio burst (FRB) source FRB 180916.J0158+65 in the 300-400-MHz frequency range with the Green Bank Telescope (GBT). Emission in multiple bursts is visible down to the bottom of the GBT band, suggesting that the cutoff frequency (if it exists) for FRB emission is lower than 300 MHz. Observations were conducted during predicted periods of activity of the source, and had simultaneous coverage with the Low Frequency Array (LOFAR) and the FRB backend on the Canadian Hydrogen Intensity Mapping Experiment (CHIME)","authors_text":"A. Josephy, A. Naidu, B. C. Andersen, B. M. Gaensler, B. W. Meyers, C. Brar, C. G. Bassa, C. Leung, C. Ng, C. Patel, D. C. Good, D. Cubranic, D. Michilli, D. Z. Li, E. Fonseca, F. Q. Dong, H. -. H. Lin, I. H. Stairs, J. Mena-Parra, J. W. T. Hessels, K. Masui, K. M. Bandura, K. M. Smith, K. Shin, K. Vanderlinde, M. Bhardwaj, M. Dobbs, M. Merryfield, M. Rafiei-Ravandi, M. Rahman, P. Chawla, P. J. Boyle, P. Sanghavi, P. Scholz, R. Mckinven, S. P. Tendulkar, T. Cassanelli, T. L. Landecker, V. M. Kaspi, Z. Pleunis","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-06T17:51:20Z","title":"Detection of Repeating FRB 180916.J0158+65 Down to Frequencies of 300 MHz"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2004.02862","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:ee7d942ad43ef86fff00dde0c1512d235b045d9df33d190e2e006f273330f274","target":"record","created_at":"2026-07-05T01:14:45Z","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":"bb650fb30afcdfd82135d067635b63328298909d5f32cda193bb560e5edd6eb7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-04-06T17:51:20Z","title_canon_sha256":"2437854af44827ee50b6754dd5ac6d8174f8cc42523235050005b1d424aca26b"},"schema_version":"1.0","source":{"id":"2004.02862","kind":"arxiv","version":2}},"canonical_sha256":"db2c9ca87637df3b033b75ff0462ba1241b9c75d61f436ae7978a7df687a39c7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"db2c9ca87637df3b033b75ff0462ba1241b9c75d61f436ae7978a7df687a39c7","first_computed_at":"2026-07-05T01:14:45.647753Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:14:45.647753Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OuuPhIN8/xzcg/svK+BHlQzGU0t3gF2JCn8s/0gq2viWJfk/IS9F2V/lHuhZLbCjEYQvy/trgfNX+bMKMj9aDw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:14:45.648220Z","signed_message":"canonical_sha256_bytes"},"source_id":"2004.02862","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee7d942ad43ef86fff00dde0c1512d235b045d9df33d190e2e006f273330f274","sha256:2f1bb7532c6c5c0e72f1b4434283d823de19b0751459f79137418f34a9e505d3"],"state_sha256":"5b1bc2cfcde4cc22f4ede8f39d22576adb575a952dc1f4f4c1b6147613fd34f4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IRU3djZ/75IvJqmKGwdnhLBZa1BeJw0q+nA/50lTiCYIZp02hSnz3SHtmOVSD/rXfDnBhYmawetb2VhQaQAcBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T14:47:59.443151Z","bundle_sha256":"6d3ce0e2dfd85b0d156fc9b22fa5d33d286e3313b18ac84efcdae9a003b9503e"}}