{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:WSD6GFDQRQGZQ7PKVOBXBPZRAR","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":"a9fb345ec859934a56e29d1dc2c045dd7a659b24eadf3b2315772845e4de6632","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-09-06T10:04:00Z","title_canon_sha256":"7b97f0ec5254083a47a9902db901f3ac3b5ee7b01cba6294224747dbd94ce301"},"schema_version":"1.0","source":{"id":"astro-ph/0309200","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0309200","created_at":"2026-07-04T16:51:36Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0309200v2","created_at":"2026-07-04T16:51:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0309200","created_at":"2026-07-04T16:51:36Z"},{"alias_kind":"pith_short_12","alias_value":"WSD6GFDQRQGZ","created_at":"2026-07-04T16:51:36Z"},{"alias_kind":"pith_short_16","alias_value":"WSD6GFDQRQGZQ7PK","created_at":"2026-07-04T16:51:36Z"},{"alias_kind":"pith_short_8","alias_value":"WSD6GFDQ","created_at":"2026-07-04T16:51:36Z"}],"graph_snapshots":[{"event_id":"sha256:b8115b485b56011893ca8d54e08c7dcd93dfc013535276cc33a34db789345ae2","target":"graph","created_at":"2026-07-04T16:51:36Z","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/astro-ph/0309200/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We show a possible way to measure the column density of free electrons along the light path, the so-called Dispersion Measure (DM), from the early $[\\sim 415 (\\nu/1 {\\rm GHz})^{-2} ({\\rm DM}/10^{5} {\\rm pc} {\\rm cm}^{-3}) {\\rm s}]$ radio afterglows of the gamma-ray bursts. We find that the proposed Square Kilometer Array can detect bright radio afterglows around the time $\\sim 10^{3}(\\nu/160 {\\rm MHz})^{-2}$ s to measure the intergalactic DM ($\\simg 6000$ pc cm$^{-3}$ at redshift $z>6$) up to $z\\sim 30$, from which we can determine the reionization history of the universe and identify the miss","authors_text":"Kunihito Ioka","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-09-06T10:04:00Z","title":"Cosmic Dispersion Measure from Gamma-Ray Burst Afterglows: Probing the Reionization History and the Burst Environment"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0309200","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":"sha256:70e7d79895449025e4b19947b1edea4a6d2840923dc6e57f30169731a2ddd452","target":"record","created_at":"2026-07-04T16:51:36Z","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":"a9fb345ec859934a56e29d1dc2c045dd7a659b24eadf3b2315772845e4de6632","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-09-06T10:04:00Z","title_canon_sha256":"7b97f0ec5254083a47a9902db901f3ac3b5ee7b01cba6294224747dbd94ce301"},"schema_version":"1.0","source":{"id":"astro-ph/0309200","kind":"arxiv","version":2}},"canonical_sha256":"b487e314708c0d987deaab8370bf31045870a4e89d9ea1148c9ee5bbdf3bbd5f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b487e314708c0d987deaab8370bf31045870a4e89d9ea1148c9ee5bbdf3bbd5f","first_computed_at":"2026-07-04T16:51:36.459308Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:51:36.459308Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bP75zFsxRUvpzfI5BQ57AOZnTOdyFCAhRRRPJna+yFItlu3Np7eSne/UbRzExnCz+uFUHLKux350YaN3xarZBg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:51:36.459651Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0309200","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:70e7d79895449025e4b19947b1edea4a6d2840923dc6e57f30169731a2ddd452","sha256:b8115b485b56011893ca8d54e08c7dcd93dfc013535276cc33a34db789345ae2"],"state_sha256":"d86bd37da8d543ecc887bc705cbd3e7e2f2ed8401c78b3bf3767244ce8954f45"}