{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:UAQWE7UOFOSWB5EJ56KCXKG7PO","short_pith_number":"pith:UAQWE7UO","canonical_record":{"source":{"id":"2009.14081","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-29T15:10:04Z","cross_cats_sorted":[],"title_canon_sha256":"0dc9aa8c13dbfce7420aec068e92e341136967680f9e9fcc3ebac0b7f9952c53","abstract_canon_sha256":"656a7a6674e0ceaee5d16c2f1088722938bd4af6e2f857780b2756d5913e3131"},"schema_version":"1.0"},"canonical_sha256":"a021627e8e2ba560f489ef942ba8df7bb0de705866ac6da9cabd5d67f154e5ba","source":{"kind":"arxiv","id":"2009.14081","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.14081","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"arxiv_version","alias_value":"2009.14081v2","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.14081","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"pith_short_12","alias_value":"UAQWE7UOFOSW","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"pith_short_16","alias_value":"UAQWE7UOFOSWB5EJ","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"pith_short_8","alias_value":"UAQWE7UO","created_at":"2026-07-05T02:55:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:UAQWE7UOFOSWB5EJ56KCXKG7PO","target":"record","payload":{"canonical_record":{"source":{"id":"2009.14081","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-29T15:10:04Z","cross_cats_sorted":[],"title_canon_sha256":"0dc9aa8c13dbfce7420aec068e92e341136967680f9e9fcc3ebac0b7f9952c53","abstract_canon_sha256":"656a7a6674e0ceaee5d16c2f1088722938bd4af6e2f857780b2756d5913e3131"},"schema_version":"1.0"},"canonical_sha256":"a021627e8e2ba560f489ef942ba8df7bb0de705866ac6da9cabd5d67f154e5ba","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:55:33.230485Z","signature_b64":"H8QgQSUUBh3eY3aEfdELP5qWUgRClJgYUoz59R7wwRoEzJ46Va29k3FC9aG+514tpCyRxTQ3NrlZsqg0kdNHCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a021627e8e2ba560f489ef942ba8df7bb0de705866ac6da9cabd5d67f154e5ba","last_reissued_at":"2026-07-05T02:55:33.230055Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:55:33.230055Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2009.14081","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":"2026-07-05T02:55:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZW97qI+XX9PFI2oemjBvUbw0TVzoj+smDBFMqPeaj6yqZRBGuhfTeMb0cbF0H0+uuH+3buYIgjkYiEN1B3aRBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T08:39:14.089858Z"},"content_sha256":"d73ff80751eeb681ea5ef661711e40cdfa179fb4417cd5a56e17790a28ef2161","schema_version":"1.0","event_id":"sha256:d73ff80751eeb681ea5ef661711e40cdfa179fb4417cd5a56e17790a28ef2161"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:UAQWE7UOFOSWB5EJ56KCXKG7PO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB191221B","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. J. van der Horst, B. van Soelen, C. G. Mundell, D. A. H. Buckley, D. A. Kann, D. H. Hartmann, D. M. Hewitt, D. N. Groenewald, D. Vlasenko, D. Xu, E. S. Gorbovskoy, I. Gorbunov, I. M. Monageng, J. Cooper, J. K. Thomas, J. Mao, K. Wiersema, M. B\\\"ottcher, N. P. M. Kuin, N. Tyurina, P. Jakobsson, R. J. Britto, R. Podesta, S. Bagnulo, S. Campana, S. Covino, S. Razzaque, V. D'Elia, V. G. Kornilov, V. Lipunov","submitted_at":"2020-09-29T15:10:04Z","abstract_excerpt":"We report on results of spectropolarimetry of the afterglow of the long gamma-ray burst GRB 191221B, obtained with SALT/RSS and VLT/FORS2, as well as photometry from two telescopes in the MASTER Global Robotic Network, at the MASTER-SAAO (South Africa) and MASTER-OAFA (Argentina) stations. Prompt optical emission was detected by MASTER-SAAO 38 s after the alert, which dimmed from a magnitude (white-light) of ~10 to 16.2 mag over a period of ~10 ks, followed by a plateau phase lasting ~10 ks and then a decline to ~18 mag after 80 ks. The light curve shows complex structure, with four or five di"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.14081","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/2009.14081/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":"2026-07-05T02:55:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Zv8MXYwRxRvzeO4sAxFRHNYXbCo2bBBAH+WPl3dOavtVszIOdJtOb+tx9JF5uVOKs2ruspTYm1hrbfTF6j9JAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T08:39:14.090334Z"},"content_sha256":"c8dd3e72c8e30052c815e39ba2d5bcc44141f384efe75056c7b68c200ccccfcc","schema_version":"1.0","event_id":"sha256:c8dd3e72c8e30052c815e39ba2d5bcc44141f384efe75056c7b68c200ccccfcc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UAQWE7UOFOSWB5EJ56KCXKG7PO/bundle.json","state_url":"https://pith.science/pith/UAQWE7UOFOSWB5EJ56KCXKG7PO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UAQWE7UOFOSWB5EJ56KCXKG7PO/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":"2026-07-05T08:39:14Z","links":{"resolver":"https://pith.science/pith/UAQWE7UOFOSWB5EJ56KCXKG7PO","bundle":"https://pith.science/pith/UAQWE7UOFOSWB5EJ56KCXKG7PO/bundle.json","state":"https://pith.science/pith/UAQWE7UOFOSWB5EJ56KCXKG7PO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UAQWE7UOFOSWB5EJ56KCXKG7PO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:UAQWE7UOFOSWB5EJ56KCXKG7PO","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":"656a7a6674e0ceaee5d16c2f1088722938bd4af6e2f857780b2756d5913e3131","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-29T15:10:04Z","title_canon_sha256":"0dc9aa8c13dbfce7420aec068e92e341136967680f9e9fcc3ebac0b7f9952c53"},"schema_version":"1.0","source":{"id":"2009.14081","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2009.14081","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"arxiv_version","alias_value":"2009.14081v2","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2009.14081","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"pith_short_12","alias_value":"UAQWE7UOFOSW","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"pith_short_16","alias_value":"UAQWE7UOFOSWB5EJ","created_at":"2026-07-05T02:55:33Z"},{"alias_kind":"pith_short_8","alias_value":"UAQWE7UO","created_at":"2026-07-05T02:55:33Z"}],"graph_snapshots":[{"event_id":"sha256:c8dd3e72c8e30052c815e39ba2d5bcc44141f384efe75056c7b68c200ccccfcc","target":"graph","created_at":"2026-07-05T02:55:33Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2009.14081/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report on results of spectropolarimetry of the afterglow of the long gamma-ray burst GRB 191221B, obtained with SALT/RSS and VLT/FORS2, as well as photometry from two telescopes in the MASTER Global Robotic Network, at the MASTER-SAAO (South Africa) and MASTER-OAFA (Argentina) stations. Prompt optical emission was detected by MASTER-SAAO 38 s after the alert, which dimmed from a magnitude (white-light) of ~10 to 16.2 mag over a period of ~10 ks, followed by a plateau phase lasting ~10 ks and then a decline to ~18 mag after 80 ks. The light curve shows complex structure, with four or five di","authors_text":"A. J. van der Horst, B. van Soelen, C. G. Mundell, D. A. H. Buckley, D. A. Kann, D. H. Hartmann, D. M. Hewitt, D. N. Groenewald, D. Vlasenko, D. Xu, E. S. Gorbovskoy, I. Gorbunov, I. M. Monageng, J. Cooper, J. K. Thomas, J. Mao, K. Wiersema, M. B\\\"ottcher, N. P. M. Kuin, N. Tyurina, P. Jakobsson, R. J. Britto, R. Podesta, S. Bagnulo, S. Campana, S. Covino, S. Razzaque, V. D'Elia, V. G. Kornilov, V. Lipunov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-29T15:10:04Z","title":"Spectropolarimetry and photometry of the early afterglow of the gamma-ray burst GRB191221B"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2009.14081","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:d73ff80751eeb681ea5ef661711e40cdfa179fb4417cd5a56e17790a28ef2161","target":"record","created_at":"2026-07-05T02:55:33Z","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":"656a7a6674e0ceaee5d16c2f1088722938bd4af6e2f857780b2756d5913e3131","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-09-29T15:10:04Z","title_canon_sha256":"0dc9aa8c13dbfce7420aec068e92e341136967680f9e9fcc3ebac0b7f9952c53"},"schema_version":"1.0","source":{"id":"2009.14081","kind":"arxiv","version":2}},"canonical_sha256":"a021627e8e2ba560f489ef942ba8df7bb0de705866ac6da9cabd5d67f154e5ba","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a021627e8e2ba560f489ef942ba8df7bb0de705866ac6da9cabd5d67f154e5ba","first_computed_at":"2026-07-05T02:55:33.230055Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:55:33.230055Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"H8QgQSUUBh3eY3aEfdELP5qWUgRClJgYUoz59R7wwRoEzJ46Va29k3FC9aG+514tpCyRxTQ3NrlZsqg0kdNHCg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:55:33.230485Z","signed_message":"canonical_sha256_bytes"},"source_id":"2009.14081","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d73ff80751eeb681ea5ef661711e40cdfa179fb4417cd5a56e17790a28ef2161","sha256:c8dd3e72c8e30052c815e39ba2d5bcc44141f384efe75056c7b68c200ccccfcc"],"state_sha256":"5561b9ddbbff0a73c829f314783c970848788226f5e53625d8ba4418e02fdd15"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3kF/hdZjJiA1K3jIduGTVlCeyf7XrFxPOYlcHdSFyIdgtR0nhId3voRmcKeD2U/ZWLJvZHWWHiqXE+SA/gGNAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T08:39:14.092574Z","bundle_sha256":"ecadb1252fbe636969a728c2b30f054ee602a4fc142754ddb5f34e3379bafb6f"}}