{"paper":{"title":"Short GRB 160821B: a reverse shock, a refreshed shock, and a well-sampled kilonova","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Corsi, A. de Ugarte Postigo, A. Higgins, A. J. Levan, A. J. van der Horst, A. S. Fruchter, B. Gompertz, C. C. Th\\\"one, D. A. Kann, D. A. Perley, D. B. Malesani, D. Watson, D. Xu, E. Pian, G. P. Lamb, G. Pugliese, J. Greiner, J. Hjorth, J. P. U. Fynbo, K. Heintz, K. Kawaguchi, K. L. Page, K. Wiersema, L. Izzo, M. Shibata, M. Tanaka, N. R. Tanvir, P. A. Evans, P. Jakobsson, P. T. O'Brien, R. A. M. J. Wijers, R. L. C. Starling, S. Rosswog, Z. Cano","submitted_at":"2019-05-06T17:19:39Z","abstract_excerpt":"We report our identification of the optical afterglow and host galaxy of the short-duration gamma-ray burst GRB 160821B. The spectroscopic redshift of the host is $z=0.162$, making it one of the lowest redshift sGRBs identified by Swift. Our intensive follow-up campaign using a range of ground-based facilities as well as HST, XMM and Swift, shows evidence for a late-time excess of optical and near-infrared emission in addition to a complex afterglow. The afterglow light-curve at X-ray frequencies reveals a narrow jet, $\\theta_j\\sim1.9^{+0.10}_{-0.03}$ deg, that is refreshed at $>1$ day post-bu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.02159","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1905.02159/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}