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Evans, P. A.; Cenko, S. B.; Kennea, J. A.; Emery, S. W. K.; Kuin, N. P. M.; Korobkin, O.; Wollaeger, R. T.; Fryer, C. L.; Madsen, K. K.; Harrison, F. A.; Xu, Y.; Nakar, E.; Hotokezaka, K.; Lien, A.; Campana, S.; Oates, S. R.; Troja, E.; Breeveld, A. A.; Marshall, F. E.; Barthelmy, S. D.; Beardmore, A. P.; Burrows, D. N.; Cusumano, G.; D’Aì, A.; D’Avanzo, P.; D’Elia, V.; de Pasquale, M.; Even, W. P.; Fontes, C. J.; Forster, K.; Garcia, J.; Giommi, P.; Grefenstette, B.; Gronwall, C.; Hartmann, D. H.; Heida, M.; Hungerford, A. L.; Kasliwal, M. M.; Krimm, H. A.; Levan, A. J.; Malesani, D.; Melandri, A.; Miyasaka, H.; Nousek, J. A.; O’Brien, P. T.; Osborne, J. P.; Pagani, C.; Page, K. L.; Palmer, D. M.; Perri, M.; Pike, S.; Racusin, J. L.; Rosswog, S.; Siegel, M. H.; Sakamoto, T.; Sbarufatti, B.; Tagliaferri, G.; Tanvir, N. R.; Tohuvavohu, A.
Science (American Association for the Advancement of Science), 12/2017, Volume: 358, Issue: 6370Journal Article
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 of the EM counter part of the binary neutron star merger GW170817. The bright, rapidly fading UV emission indicates a high mass (≈0.03 solar masses) wind-driven outflow with moderate electron fraction (Yₑ ≈ 0.27). Combined with the x-ray limits, we favor an observer viewing angle of ≈30° away from the orbital rotation axis, which avoids both obscuration fromthe heaviest elements in the orbital plane and a direct view of any ultrarelativistic, highly collimated ejecta (a γ-ray burst afterglow).
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