{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:MMBW7FYY7MPJD2T5POFD5PHTU3","short_pith_number":"pith:MMBW7FYY","canonical_record":{"source":{"id":"1312.2662","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-10T04:19:22Z","cross_cats_sorted":[],"title_canon_sha256":"ce0120b99c3d437a767d96fdea6ee4c4410012410b8db7a058554e100564ba96","abstract_canon_sha256":"ec44418b6319427039fbcae2f0d5b744fae57c3814bbe8a9cff729d733e7e358"},"schema_version":"1.0"},"canonical_sha256":"63036f9718fb1e91ea7d7b8a3ebcf3a6debe983be8e773f7d9d4a0c6a745d407","source":{"kind":"arxiv","id":"1312.2662","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1312.2662","created_at":"2026-05-18T01:45:52Z"},{"alias_kind":"arxiv_version","alias_value":"1312.2662v1","created_at":"2026-05-18T01:45:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1312.2662","created_at":"2026-05-18T01:45:52Z"},{"alias_kind":"pith_short_12","alias_value":"MMBW7FYY7MPJ","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MMBW7FYY7MPJD2T5","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MMBW7FYY","created_at":"2026-05-18T12:27:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:MMBW7FYY7MPJD2T5POFD5PHTU3","target":"record","payload":{"canonical_record":{"source":{"id":"1312.2662","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-10T04:19:22Z","cross_cats_sorted":[],"title_canon_sha256":"ce0120b99c3d437a767d96fdea6ee4c4410012410b8db7a058554e100564ba96","abstract_canon_sha256":"ec44418b6319427039fbcae2f0d5b744fae57c3814bbe8a9cff729d733e7e358"},"schema_version":"1.0"},"canonical_sha256":"63036f9718fb1e91ea7d7b8a3ebcf3a6debe983be8e773f7d9d4a0c6a745d407","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:45:52.284013Z","signature_b64":"63SBwzCYuw4itEVlXGBrM8+uTxvnsdnADBO94rFlT/Q/023MySmfxIj+3bCBcvzSIGd0JhTJt6CbK1elSDyoBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"63036f9718fb1e91ea7d7b8a3ebcf3a6debe983be8e773f7d9d4a0c6a745d407","last_reissued_at":"2026-05-18T01:45:52.283536Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:45:52.283536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1312.2662","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":"2026-05-18T01:45:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+TBPgGKxKkulbMDZIvRj0F0s24fGtGiXLzALPWwyTvtQbApQZ9ZMmF3mrNzQZY6DtOpmK3PQnkSl4M563xFWAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T19:40:23.169136Z"},"content_sha256":"8661403f88d248fa108df3f29ec5f74db27b9a414f54dd52d8c9288e970539d4","schema_version":"1.0","event_id":"sha256:8661403f88d248fa108df3f29ec5f74db27b9a414f54dd52d8c9288e970539d4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:MMBW7FYY7MPJD2T5POFD5PHTU3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"High energy emission of GRB 130821A: constraining the density profile of the circum-burst medium as well as the initial Lorentz factor of the outflow","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Bei Zhou, Da-Ming Wei (Purple Mountain Observatory), Hao-Ning He (Purple Mountain Observatory), Pak-Hin Thomas Tam (National Tsing Hua Univ.), Yi-Zhong Fan, Yun-Feng Liang","submitted_at":"2013-12-10T04:19:22Z","abstract_excerpt":"GRB 130821A was detected by Fermi-GBM/LAT, Konus-Wind, SPI-ACS/INTEGRAL, RHESSI and Mars Odyssey-HEND. Although the data of GRB 130821A are very limited, we show in this work that the high energy gamma-ray emission (i.e., above 100 MeV) alone imposes tight constraint on the density profile of the circum-burst medium as well as the initial Lorentz factor of the outflow. The temporal behavior of the high energy gamma-ray emission is consistent with the forward shock synchrotron radiation model and the circum-burst medium likely has a constant-density profile. The Lorentz factor is about a few hu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.2662","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":""},"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":"2026-05-18T01:45:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NuKdPRw8SgeOpZPQlQTkLV2/YQIka9H1gLQOA8n8LxGtf3GiPl17g4vW6aSnd5Ra2pKJzkXdYPWnVI9XB9ZgAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T19:40:23.169813Z"},"content_sha256":"5745f814de6559e4b2517cfd967a6aec69a1ba4edd8eaba5796269e54c50d385","schema_version":"1.0","event_id":"sha256:5745f814de6559e4b2517cfd967a6aec69a1ba4edd8eaba5796269e54c50d385"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MMBW7FYY7MPJD2T5POFD5PHTU3/bundle.json","state_url":"https://pith.science/pith/MMBW7FYY7MPJD2T5POFD5PHTU3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MMBW7FYY7MPJD2T5POFD5PHTU3/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":"2026-05-31T19:40:23Z","links":{"resolver":"https://pith.science/pith/MMBW7FYY7MPJD2T5POFD5PHTU3","bundle":"https://pith.science/pith/MMBW7FYY7MPJD2T5POFD5PHTU3/bundle.json","state":"https://pith.science/pith/MMBW7FYY7MPJD2T5POFD5PHTU3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MMBW7FYY7MPJD2T5POFD5PHTU3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:MMBW7FYY7MPJD2T5POFD5PHTU3","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":"ec44418b6319427039fbcae2f0d5b744fae57c3814bbe8a9cff729d733e7e358","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-10T04:19:22Z","title_canon_sha256":"ce0120b99c3d437a767d96fdea6ee4c4410012410b8db7a058554e100564ba96"},"schema_version":"1.0","source":{"id":"1312.2662","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1312.2662","created_at":"2026-05-18T01:45:52Z"},{"alias_kind":"arxiv_version","alias_value":"1312.2662v1","created_at":"2026-05-18T01:45:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1312.2662","created_at":"2026-05-18T01:45:52Z"},{"alias_kind":"pith_short_12","alias_value":"MMBW7FYY7MPJ","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"MMBW7FYY7MPJD2T5","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"MMBW7FYY","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:5745f814de6559e4b2517cfd967a6aec69a1ba4edd8eaba5796269e54c50d385","target":"graph","created_at":"2026-05-18T01:45:52Z","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":"GRB 130821A was detected by Fermi-GBM/LAT, Konus-Wind, SPI-ACS/INTEGRAL, RHESSI and Mars Odyssey-HEND. Although the data of GRB 130821A are very limited, we show in this work that the high energy gamma-ray emission (i.e., above 100 MeV) alone imposes tight constraint on the density profile of the circum-burst medium as well as the initial Lorentz factor of the outflow. The temporal behavior of the high energy gamma-ray emission is consistent with the forward shock synchrotron radiation model and the circum-burst medium likely has a constant-density profile. The Lorentz factor is about a few hu","authors_text":"Bei Zhou, Da-Ming Wei (Purple Mountain Observatory), Hao-Ning He (Purple Mountain Observatory), Pak-Hin Thomas Tam (National Tsing Hua Univ.), Yi-Zhong Fan, Yun-Feng Liang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-10T04:19:22Z","title":"High energy emission of GRB 130821A: constraining the density profile of the circum-burst medium as well as the initial Lorentz factor of the outflow"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.2662","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":"sha256:8661403f88d248fa108df3f29ec5f74db27b9a414f54dd52d8c9288e970539d4","target":"record","created_at":"2026-05-18T01:45:52Z","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":"ec44418b6319427039fbcae2f0d5b744fae57c3814bbe8a9cff729d733e7e358","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-10T04:19:22Z","title_canon_sha256":"ce0120b99c3d437a767d96fdea6ee4c4410012410b8db7a058554e100564ba96"},"schema_version":"1.0","source":{"id":"1312.2662","kind":"arxiv","version":1}},"canonical_sha256":"63036f9718fb1e91ea7d7b8a3ebcf3a6debe983be8e773f7d9d4a0c6a745d407","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"63036f9718fb1e91ea7d7b8a3ebcf3a6debe983be8e773f7d9d4a0c6a745d407","first_computed_at":"2026-05-18T01:45:52.283536Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:45:52.283536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"63SBwzCYuw4itEVlXGBrM8+uTxvnsdnADBO94rFlT/Q/023MySmfxIj+3bCBcvzSIGd0JhTJt6CbK1elSDyoBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:45:52.284013Z","signed_message":"canonical_sha256_bytes"},"source_id":"1312.2662","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8661403f88d248fa108df3f29ec5f74db27b9a414f54dd52d8c9288e970539d4","sha256:5745f814de6559e4b2517cfd967a6aec69a1ba4edd8eaba5796269e54c50d385"],"state_sha256":"21188d96b1660a7303d66190e1ee6fad9888b605f0d1194c8f3b95c0a19cafa8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0T1+o33YC5Y4rIHYk65C/mTE3ePLYDrJf2fpkHeLpn6sftHNApNpqTo3IPuwWC1aewsiczRSzBMdT3ZKScdwAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T19:40:23.174098Z","bundle_sha256":"7845febbea0bc8010a04d549c92f7097a15116e32b47ae4621c488dd0852d1d8"}}