{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:3F6EHQ7UQ4M64RZLIMTNOA6WGT","short_pith_number":"pith:3F6EHQ7U","canonical_record":{"source":{"id":"1310.2540","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-10-09T16:38:54Z","cross_cats_sorted":[],"title_canon_sha256":"a7ef4b4bd14b4f79b717eea959330625ae74f773f5437a2d26f7f0aaaff5bdd5","abstract_canon_sha256":"ad3682ef7ea4ff8f9a6e073764474f22e5764fd5a7be29a60a42e1170afcaaad"},"schema_version":"1.0"},"canonical_sha256":"d97c43c3f48719ee472b4326d703d634e900400661dfef84cff1477cb95814d7","source":{"kind":"arxiv","id":"1310.2540","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.2540","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"arxiv_version","alias_value":"1310.2540v2","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.2540","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"pith_short_12","alias_value":"3F6EHQ7UQ4M6","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"3F6EHQ7UQ4M64RZL","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"3F6EHQ7U","created_at":"2026-05-18T12:27:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:3F6EHQ7UQ4M64RZLIMTNOA6WGT","target":"record","payload":{"canonical_record":{"source":{"id":"1310.2540","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-10-09T16:38:54Z","cross_cats_sorted":[],"title_canon_sha256":"a7ef4b4bd14b4f79b717eea959330625ae74f773f5437a2d26f7f0aaaff5bdd5","abstract_canon_sha256":"ad3682ef7ea4ff8f9a6e073764474f22e5764fd5a7be29a60a42e1170afcaaad"},"schema_version":"1.0"},"canonical_sha256":"d97c43c3f48719ee472b4326d703d634e900400661dfef84cff1477cb95814d7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:43:09.907976Z","signature_b64":"s7CXvMvluhuLhSSy79I58gBD2qZHj+bf5WidZSZEb9shbBf9c59ZzIHIGkzLuHHcYAHYhiKdYN5M/dYVyJsRDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d97c43c3f48719ee472b4326d703d634e900400661dfef84cff1477cb95814d7","last_reissued_at":"2026-05-18T00:43:09.907372Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:43:09.907372Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1310.2540","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":"2026-05-18T00:43:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Sl6A9HR7cxoOAVdaLdabGcuY4WeHjQIwSewrFNwbKgVg8/aZ1vga7wWSjqLI1zMR5hGxT3NtHVmORzCcxoE6BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T12:05:36.399495Z"},"content_sha256":"61d05787a084cf3323005bc6b620c0c727df7d6d5708bda1081532d21eb13f59","schema_version":"1.0","event_id":"sha256:61d05787a084cf3323005bc6b620c0c727df7d6d5708bda1081532d21eb13f59"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:3F6EHQ7UQ4M64RZLIMTNOA6WGT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"How Long does a Burst Burst?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Bin-Bin Zhang, Bing Zhang, Kohta Murase, Michael S. Briggs, Valerie Connaughton","submitted_at":"2013-10-09T16:38:54Z","abstract_excerpt":"Several gamma-ray bursts (GRBs) last much longer (~hours) in gamma-rays than typical long GRBs (~ minutes), and recently it was proposed that these \"ultra-long GRBs\" may form a distinct population, probably with a different (e.g. blue supergiant) progenitor than typical GRBs. However, Swift observations suggest that many GRBs have extended central engine activities manifested as flares and internal plateaus in X-rays. We perform a comprehensive study on a large sample of Swift GRBs with XRT observations to investigate GRB central engine activity duration and to determine whether ultra-long GRB"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.2540","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":""},"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":"2026-05-18T00:43:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wqRMHh+23YYD7BwN84zacte8x0wyG60kQ0s5zTIvEoI5gNsmfEbbaozc28lw6APO+adVglXwiG3pksHb18krBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T12:05:36.400127Z"},"content_sha256":"c7aeda26d1365293aa5d1afc167f8b67c282031c46eff5c7abe8676421629f33","schema_version":"1.0","event_id":"sha256:c7aeda26d1365293aa5d1afc167f8b67c282031c46eff5c7abe8676421629f33"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3F6EHQ7UQ4M64RZLIMTNOA6WGT/bundle.json","state_url":"https://pith.science/pith/3F6EHQ7UQ4M64RZLIMTNOA6WGT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3F6EHQ7UQ4M64RZLIMTNOA6WGT/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":"2026-06-03T12:05:36Z","links":{"resolver":"https://pith.science/pith/3F6EHQ7UQ4M64RZLIMTNOA6WGT","bundle":"https://pith.science/pith/3F6EHQ7UQ4M64RZLIMTNOA6WGT/bundle.json","state":"https://pith.science/pith/3F6EHQ7UQ4M64RZLIMTNOA6WGT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3F6EHQ7UQ4M64RZLIMTNOA6WGT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:3F6EHQ7UQ4M64RZLIMTNOA6WGT","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":"ad3682ef7ea4ff8f9a6e073764474f22e5764fd5a7be29a60a42e1170afcaaad","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-10-09T16:38:54Z","title_canon_sha256":"a7ef4b4bd14b4f79b717eea959330625ae74f773f5437a2d26f7f0aaaff5bdd5"},"schema_version":"1.0","source":{"id":"1310.2540","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1310.2540","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"arxiv_version","alias_value":"1310.2540v2","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1310.2540","created_at":"2026-05-18T00:43:09Z"},{"alias_kind":"pith_short_12","alias_value":"3F6EHQ7UQ4M6","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"3F6EHQ7UQ4M64RZL","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"3F6EHQ7U","created_at":"2026-05-18T12:27:32Z"}],"graph_snapshots":[{"event_id":"sha256:c7aeda26d1365293aa5d1afc167f8b67c282031c46eff5c7abe8676421629f33","target":"graph","created_at":"2026-05-18T00:43:09Z","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":"Several gamma-ray bursts (GRBs) last much longer (~hours) in gamma-rays than typical long GRBs (~ minutes), and recently it was proposed that these \"ultra-long GRBs\" may form a distinct population, probably with a different (e.g. blue supergiant) progenitor than typical GRBs. However, Swift observations suggest that many GRBs have extended central engine activities manifested as flares and internal plateaus in X-rays. We perform a comprehensive study on a large sample of Swift GRBs with XRT observations to investigate GRB central engine activity duration and to determine whether ultra-long GRB","authors_text":"Bin-Bin Zhang, Bing Zhang, Kohta Murase, Michael S. Briggs, Valerie Connaughton","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-10-09T16:38:54Z","title":"How Long does a Burst Burst?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.2540","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":"sha256:61d05787a084cf3323005bc6b620c0c727df7d6d5708bda1081532d21eb13f59","target":"record","created_at":"2026-05-18T00:43:09Z","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":"ad3682ef7ea4ff8f9a6e073764474f22e5764fd5a7be29a60a42e1170afcaaad","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-10-09T16:38:54Z","title_canon_sha256":"a7ef4b4bd14b4f79b717eea959330625ae74f773f5437a2d26f7f0aaaff5bdd5"},"schema_version":"1.0","source":{"id":"1310.2540","kind":"arxiv","version":2}},"canonical_sha256":"d97c43c3f48719ee472b4326d703d634e900400661dfef84cff1477cb95814d7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d97c43c3f48719ee472b4326d703d634e900400661dfef84cff1477cb95814d7","first_computed_at":"2026-05-18T00:43:09.907372Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:43:09.907372Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"s7CXvMvluhuLhSSy79I58gBD2qZHj+bf5WidZSZEb9shbBf9c59ZzIHIGkzLuHHcYAHYhiKdYN5M/dYVyJsRDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:43:09.907976Z","signed_message":"canonical_sha256_bytes"},"source_id":"1310.2540","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:61d05787a084cf3323005bc6b620c0c727df7d6d5708bda1081532d21eb13f59","sha256:c7aeda26d1365293aa5d1afc167f8b67c282031c46eff5c7abe8676421629f33"],"state_sha256":"f1a3cfc4a63ea3a06db57001f4ca13ede0d5c5a69ccc37ba7d3b9fbf2d111de7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KRNMl712vRb3MLJVw8YaZYKcsR5345PzjpRI+94qHJleJMoMw0VJc5FVchAQyDe0Gwp2i1DZ7zrgwqwAPGvRDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T12:05:36.402977Z","bundle_sha256":"ce7b8a6fe50b8a464900c63b649de0163eaf95516518fc0e0da6701177ad9c37"}}