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Title: Swift and NuSTAR observations of GW170817: detection of a blue kilonova
Authors: 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'Ai, A.
D'Avanzo, P.
D'Elia, V.
Pasquale, M. D.
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.
First Published: 16-Oct-2017
Publisher: American Association for the Advancement of Science
Citation: Science, 2017,eaap9580
Abstract: 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 GW 170817. The bright, rapidly fading ultraviolet 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 from the heaviest elements in the orbital plane and a direct view of any ultra-relativistic, highly collimated ejecta (a γ-ray burst afterglow).
DOI Link: 10.1126/science.aap9580
ISSN: 0036-8075
eISSN: 1095-9203
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2017, American Association for the Advancement of Science. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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