{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:ZAWMMP6II4TZRV7ZC56TM2UQH2","short_pith_number":"pith:ZAWMMP6I","canonical_record":{"source":{"id":"2101.03084","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-01-07T15:06:44Z","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","hep-ex"],"title_canon_sha256":"bb5df39bf001aa304669ae4a039db277cd18add028a0630f99d8d3f6f4c1dc86","abstract_canon_sha256":"3676fe1d9b4adc4f3baf263bada27b84235822b84a811104c954fd4ffa22d75d"},"schema_version":"1.0"},"canonical_sha256":"c82cc63fc8472798d7f9177d366a903ebc7ecc4936767f75c4a048d41c135846","source":{"kind":"arxiv","id":"2101.03084","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.03084","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"arxiv_version","alias_value":"2101.03084v1","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.03084","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"pith_short_12","alias_value":"ZAWMMP6II4TZ","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"pith_short_16","alias_value":"ZAWMMP6II4TZRV7Z","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"pith_short_8","alias_value":"ZAWMMP6I","created_at":"2026-07-05T02:05:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:ZAWMMP6II4TZRV7ZC56TM2UQH2","target":"record","payload":{"canonical_record":{"source":{"id":"2101.03084","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-01-07T15:06:44Z","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","hep-ex"],"title_canon_sha256":"bb5df39bf001aa304669ae4a039db277cd18add028a0630f99d8d3f6f4c1dc86","abstract_canon_sha256":"3676fe1d9b4adc4f3baf263bada27b84235822b84a811104c954fd4ffa22d75d"},"schema_version":"1.0"},"canonical_sha256":"c82cc63fc8472798d7f9177d366a903ebc7ecc4936767f75c4a048d41c135846","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:05:34.109711Z","signature_b64":"vF/S+pf0m/6kuVUtYwr64U33boo2Ekv3nySLnYP3xPjgz0TGUP25S9dPBRj0QKe/WVh8razKus3y5jc1VXF1Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c82cc63fc8472798d7f9177d366a903ebc7ecc4936767f75c4a048d41c135846","last_reissued_at":"2026-07-05T02:05:34.109224Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:05:34.109224Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2101.03084","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":"2026-07-05T02:05:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rczWpj1IzRLjKJbxHBpHtBNC4aLJl1YN+s6LpJM99tJT14qZwRdqH5D6P+OBOQbv9QOKjt4OcnZIP4ig+YV5Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T21:47:27.980267Z"},"content_sha256":"93f6de7015ef345280fda18f37ab9abfb36330a23d0aa29f4ac7f6addefbad7b","schema_version":"1.0","event_id":"sha256:93f6de7015ef345280fda18f37ab9abfb36330a23d0aa29f4ac7f6addefbad7b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:ZAWMMP6II4TZRV7ZC56TM2UQH2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"POLAR-2: a large scale gamma-ray polarimeter for GRBs","license":"http://creativecommons.org/publicdomain/zero/1.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.HE","hep-ex"],"primary_cat":"astro-ph.IM","authors_text":"A. Pollo, A. Zadrozny, B. Wu, D. Rybka, F. Cadoux, H. Li, J. Greinerd, J. Hulsman, J. M. Burgess, J. Stauffer, J. Sun, M. Kole, N. De Angelis, N. Produit, S.Mianowski, S.N.Zhang, X. Wu","submitted_at":"2021-01-07T15:06:44Z","abstract_excerpt":"The prompt emission of GRBs has been investigated for more than 50 years but remains poorly understood. Commonly, spectral and temporal profiles of {\\gamma}-ray emission are analysed. However, they are insufficient for a complete picture on GRB-related physics. The addition of polarization measurements provides invaluable information towards the understanding of these astrophysical sources. In recent years, dedicated polarimeters, such as POLAR and GAP, were built. The former of which observed low levels of polarization as well as a temporal evolution of the polarization angle. It was understo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.03084","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2101.03084/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":"2026-07-05T02:05:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qfW0ec0Wv5PdPFuaFMAI6zHYmb12QYUEj3BDIKt0z0AqxfZ88h5pP0b8D2ZlRHxohIo7ssfqo5yASriBEG6dCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T21:47:27.980662Z"},"content_sha256":"6e352f0f54010c42e0cc845f5d3cecbf1fbbe378ca7f4302479c9105b8387316","schema_version":"1.0","event_id":"sha256:6e352f0f54010c42e0cc845f5d3cecbf1fbbe378ca7f4302479c9105b8387316"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZAWMMP6II4TZRV7ZC56TM2UQH2/bundle.json","state_url":"https://pith.science/pith/ZAWMMP6II4TZRV7ZC56TM2UQH2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZAWMMP6II4TZRV7ZC56TM2UQH2/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":"2026-07-06T21:47:27Z","links":{"resolver":"https://pith.science/pith/ZAWMMP6II4TZRV7ZC56TM2UQH2","bundle":"https://pith.science/pith/ZAWMMP6II4TZRV7ZC56TM2UQH2/bundle.json","state":"https://pith.science/pith/ZAWMMP6II4TZRV7ZC56TM2UQH2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZAWMMP6II4TZRV7ZC56TM2UQH2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:ZAWMMP6II4TZRV7ZC56TM2UQH2","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":"3676fe1d9b4adc4f3baf263bada27b84235822b84a811104c954fd4ffa22d75d","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","hep-ex"],"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-01-07T15:06:44Z","title_canon_sha256":"bb5df39bf001aa304669ae4a039db277cd18add028a0630f99d8d3f6f4c1dc86"},"schema_version":"1.0","source":{"id":"2101.03084","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2101.03084","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"arxiv_version","alias_value":"2101.03084v1","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2101.03084","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"pith_short_12","alias_value":"ZAWMMP6II4TZ","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"pith_short_16","alias_value":"ZAWMMP6II4TZRV7Z","created_at":"2026-07-05T02:05:34Z"},{"alias_kind":"pith_short_8","alias_value":"ZAWMMP6I","created_at":"2026-07-05T02:05:34Z"}],"graph_snapshots":[{"event_id":"sha256:6e352f0f54010c42e0cc845f5d3cecbf1fbbe378ca7f4302479c9105b8387316","target":"graph","created_at":"2026-07-05T02:05:34Z","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/2101.03084/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The prompt emission of GRBs has been investigated for more than 50 years but remains poorly understood. Commonly, spectral and temporal profiles of {\\gamma}-ray emission are analysed. However, they are insufficient for a complete picture on GRB-related physics. The addition of polarization measurements provides invaluable information towards the understanding of these astrophysical sources. In recent years, dedicated polarimeters, such as POLAR and GAP, were built. The former of which observed low levels of polarization as well as a temporal evolution of the polarization angle. It was understo","authors_text":"A. Pollo, A. Zadrozny, B. Wu, D. Rybka, F. Cadoux, H. Li, J. Greinerd, J. Hulsman, J. M. Burgess, J. Stauffer, J. Sun, M. Kole, N. De Angelis, N. Produit, S.Mianowski, S.N.Zhang, X. Wu","cross_cats":["astro-ph.GA","astro-ph.HE","hep-ex"],"headline":"","license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-01-07T15:06:44Z","title":"POLAR-2: a large scale gamma-ray polarimeter for GRBs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2101.03084","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":"sha256:93f6de7015ef345280fda18f37ab9abfb36330a23d0aa29f4ac7f6addefbad7b","target":"record","created_at":"2026-07-05T02:05:34Z","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":"3676fe1d9b4adc4f3baf263bada27b84235822b84a811104c954fd4ffa22d75d","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","hep-ex"],"license":"http://creativecommons.org/publicdomain/zero/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-01-07T15:06:44Z","title_canon_sha256":"bb5df39bf001aa304669ae4a039db277cd18add028a0630f99d8d3f6f4c1dc86"},"schema_version":"1.0","source":{"id":"2101.03084","kind":"arxiv","version":1}},"canonical_sha256":"c82cc63fc8472798d7f9177d366a903ebc7ecc4936767f75c4a048d41c135846","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c82cc63fc8472798d7f9177d366a903ebc7ecc4936767f75c4a048d41c135846","first_computed_at":"2026-07-05T02:05:34.109224Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:05:34.109224Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vF/S+pf0m/6kuVUtYwr64U33boo2Ekv3nySLnYP3xPjgz0TGUP25S9dPBRj0QKe/WVh8razKus3y5jc1VXF1Cw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:05:34.109711Z","signed_message":"canonical_sha256_bytes"},"source_id":"2101.03084","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93f6de7015ef345280fda18f37ab9abfb36330a23d0aa29f4ac7f6addefbad7b","sha256:6e352f0f54010c42e0cc845f5d3cecbf1fbbe378ca7f4302479c9105b8387316"],"state_sha256":"ecf5aa2082b338a17969fc5aaef1800062036d98a78a862af1ffd5142f202291"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sz+Cim1dNILWy7AJDIAxCFLePKQ971Rt6xi25xfG/Xak2Mr0uCMsh946xoBE8jqsGcJqvNs9JFBwOjs29eZUAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T21:47:27.982968Z","bundle_sha256":"f606010a1e240ac53ed65796199be1455a5bcf4d9b6360f9635b91a47f7af713"}}