{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1999:B5YM76EQUSKTTJRRO6XVUEWJLO","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":"d755e1fd08e6c1e17a2d400410b5aac9d16b9e13e34d74a27c2cb9796129acb2","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-05-25T21:06:09Z","title_canon_sha256":"610b495fbc54eebaa6439a1ce5308a2ccb55b5dc9b2c6c56e293ef2b38b75f52"},"schema_version":"1.0","source":{"id":"astro-ph/9905306","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/9905306","created_at":"2026-07-04T16:11:14Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/9905306v4","created_at":"2026-07-04T16:11:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/9905306","created_at":"2026-07-04T16:11:14Z"},{"alias_kind":"pith_short_12","alias_value":"B5YM76EQUSKT","created_at":"2026-07-04T16:11:14Z"},{"alias_kind":"pith_short_16","alias_value":"B5YM76EQUSKTTJRR","created_at":"2026-07-04T16:11:14Z"},{"alias_kind":"pith_short_8","alias_value":"B5YM76EQ","created_at":"2026-07-04T16:11:14Z"}],"graph_snapshots":[{"event_id":"sha256:c86a90a6d4110db95186deff12528b88cacb6ccf9fd405737bae24a33039fea6","target":"graph","created_at":"2026-07-04T16:11:14Z","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/9905306/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present multi-color optical and two-frequency radio observations of the bright SAX event, GRB 990510. The well-sampled optical decay, together with the radio observations are inconsistent with simple spherical afterglow models. The achromatic optical steepening and the decay of the radio afterglow both occuring at $t \\sim 1$ day are evidence for hydrodynamical evolution of the source, and can be most easily interpreted by models where the GRB ejecta are collimated in a jet. Employing a simple jet model to interpret the observations, we derive a jet opening angle of $\\theta_o = 0.08$, reduci","authors_text":"B. E. Schaefer, B. P. Schmidt, D. A. Frail, D. McConnell, E. Firth, F. A. Harrison, J. Mould, J. S. Bloom, L. Amati, M. H. Wieringa, P. J. McCarthy, P. Soffitta, R. G. McMahon R. O. Markze, R. M. Wark, R. Sari, R. Subrahmanyan, S. G. Djorgovski, S. R. Kulkarni, T. Axelrod","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"1999-05-25T21:06:09Z","title":"Optical and Radio Observations of the Afterglow from GRB990510: Evidence for a Jet"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9905306","kind":"arxiv","version":4},"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":"sha256:5b34658c5747c4e2c3634bdf6409d7ff2d5a58f2ec140af6db0140781f01d39f","target":"record","created_at":"2026-07-04T16:11:14Z","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":"d755e1fd08e6c1e17a2d400410b5aac9d16b9e13e34d74a27c2cb9796129acb2","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"1999-05-25T21:06:09Z","title_canon_sha256":"610b495fbc54eebaa6439a1ce5308a2ccb55b5dc9b2c6c56e293ef2b38b75f52"},"schema_version":"1.0","source":{"id":"astro-ph/9905306","kind":"arxiv","version":4}},"canonical_sha256":"0f70cff890a49539a63177af5a12c95bbf7080330fdcc7214c937a7c9cd07e9d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0f70cff890a49539a63177af5a12c95bbf7080330fdcc7214c937a7c9cd07e9d","first_computed_at":"2026-07-04T16:11:14.960604Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:11:14.960604Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8JTIrdhIM9OFzFfspKlahngJT5VU+eg3GidcGkSzaioaDdvEwaTIqUlp4iKi+h2PR6CBFsBhfjxFljL2j2XsAg==","signature_status":"signed_v1","signed_at":"2026-07-04T16:11:14.961069Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/9905306","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5b34658c5747c4e2c3634bdf6409d7ff2d5a58f2ec140af6db0140781f01d39f","sha256:c86a90a6d4110db95186deff12528b88cacb6ccf9fd405737bae24a33039fea6"],"state_sha256":"977cb239df9d2eb2380b0ca812d118e03ecf594db2284be1d82d9fa4272ebb45"}