{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:VCPAPQWL772RGQJNSJIGIK3TT6","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":"b9cd834ab39af8c0212447bae2bf061d9c69a7558978d0cfc895378a80fc9fd3","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-08-11T20:03:37Z","title_canon_sha256":"dce5e6721cc67cb44571573df5bb5a92a5a654c7dd52fd121aa4a984d89b7608"},"schema_version":"1.0","source":{"id":"astro-ph/0308189","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0308189","created_at":"2026-07-04T16:51:27Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0308189v1","created_at":"2026-07-04T16:51:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0308189","created_at":"2026-07-04T16:51:27Z"},{"alias_kind":"pith_short_12","alias_value":"VCPAPQWL772R","created_at":"2026-07-04T16:51:27Z"},{"alias_kind":"pith_short_16","alias_value":"VCPAPQWL772RGQJN","created_at":"2026-07-04T16:51:27Z"},{"alias_kind":"pith_short_8","alias_value":"VCPAPQWL","created_at":"2026-07-04T16:51:27Z"}],"graph_snapshots":[{"event_id":"sha256:78f78925cc64c3e01fff5582890840f06e892f924af6030e48df6bd4a85c64e8","target":"graph","created_at":"2026-07-04T16:51:27Z","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/0308189/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a sample of radio afterglow light curves with measured decay slopes which show evidence for a flattening at late times compared to optical and X-ray decay indices. The simplest origin for this behavior is that the change in slope is due to a jet-like outflow making a transition to sub-relativistic expansion. This can explain the late-time radio light curves for many but not all of the bursts in the sample. We investigate several possible modifications to the standard fireball model which can flatten late-time light curves. Changes to the shock microphysics which govern particle acce","authors_text":"B. D. Metzger, D. A. Frail, E. Berger, S. A. Yost, S. R. Kulkarni","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-08-11T20:03:37Z","title":"A Late-Time Flattening of Afterglow Light Curves"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0308189","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":"sha256:8136f99c74326a832dbb404aab0ced5b921d3b92aeca01fcf48f75cb756e07f4","target":"record","created_at":"2026-07-04T16:51:27Z","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":"b9cd834ab39af8c0212447bae2bf061d9c69a7558978d0cfc895378a80fc9fd3","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-08-11T20:03:37Z","title_canon_sha256":"dce5e6721cc67cb44571573df5bb5a92a5a654c7dd52fd121aa4a984d89b7608"},"schema_version":"1.0","source":{"id":"astro-ph/0308189","kind":"arxiv","version":1}},"canonical_sha256":"a89e07c2cbfff513412d9250642b739f82b39d156ceb75964b92546775325ad5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a89e07c2cbfff513412d9250642b739f82b39d156ceb75964b92546775325ad5","first_computed_at":"2026-07-04T16:51:27.263245Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:51:27.263245Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CaV0b0lNNTzFKfD1qtEYs45HCLZqWz8qxab1m/4u9qsVT/Pr36hZ2am6ZWNVLCTjJYvUIATdKS+UobtKude0AQ==","signature_status":"signed_v1","signed_at":"2026-07-04T16:51:27.263768Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0308189","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8136f99c74326a832dbb404aab0ced5b921d3b92aeca01fcf48f75cb756e07f4","sha256:78f78925cc64c3e01fff5582890840f06e892f924af6030e48df6bd4a85c64e8"],"state_sha256":"0c4e0cbfbb15c9fd724f88557442ed295b7b0b679842975898e60e1a166f9ff9"}