{"paper":{"title":"Swift and NuSTAR observations of GW170817: detection of a blue kilonova","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A.A. Breeveld, A. D'Ai, A.J. Levan, A.L. Hungerford, A. Lien, A. Melandri, A. P. Beardmore, A. Tohuvavohu, B. Grefenstette, B. Sbarufatti, C. Gronwall, C.J. Fontes, C.L. Fryer, C. Pagani, D.H. Hartmann, D. Malesani, D.M. Palmer, D.N. Burrows, E. Nakar, E. Troja, F.A. Harrison, F. E. Marshall, G. Cusumano, G. Tagliaferri, H.A. Krimm, H. Miyasaka, J.A. Kennea, J.A. Nousek, J. Garcia, J.L. Racusin, J.P. Osborne, K. Forster, K. Hotokezaka, K.K. Madsen, K.L. Page, M. De Pasquale, M. Heida, M.H. Siegel, M.M. Kasliwal, M. Perri, N.P.M. Kuin, N.R. Tanvir, O. Korobkin, P.A. Evans, P. D'Avanzo, P. Giommi, P.T. O'Brien, R.T. Wollaeger, S.B. Cenko, S. Campana, S.D. Barthelmy, S. Pike, S.R. Oates, S. Rosswog, S.W.K. Emery, T. Sakamoto, V. D'Elia, W.P. Even, Y. Xu","submitted_at":"2017-10-16T16:57:45Z","abstract_excerpt":"With the first direct detection of merging black holes in 2015, the era of gravitational wave (GW) astrophysics began. A complete picture of compact object mergers, however, requires the detection of an electromagnetic (EM) counterpart. We report ultraviolet (UV) and X-ray observations by Swift and the Nuclear Spectroscopic Telescope ARray (NuSTAR) of the EM counterpart of the binary neutron star merger GW170817. The bright, rapidly fading ultraviolet emission indicates a high mass ($\\approx0.03$ solar masses) wind-driven outflow with moderate electron fraction ($Y_{e}\\approx0.27$). Combined w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.05437","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"}