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Title: Swift and NuSTAR observations of GW170817: Detection of a blue kilonova

Journal Article · · Science
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  1. Univ. of Leicester (United Kingdom)
  2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. Univ. College London, Dorking (United Kingdom)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  7. Tel Aviv Univ., Ramat Aviv (Israel)
  8. Simons Foundation, New York, NY (United States)
  9. Center for Research and Exploration in Space Science and Technology (CRESST) and NASA Goddard Space Flight Center, Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
  10. National Inst. for Astrophysics (INAF), Roma (Italy)
  11. Univ. of Warwick, Coventry (United Kingdom)
  12. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  13. National Inst. for Astrophysics (INAF), Palermo (Italy)
  14. National Inst. for Astrophysics (INAF), Catone (Italy); Space Science Data Center (SSDC), Rome (Italy)
  15. Univ. of Istanbul (Turkey)
  16. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Southern Utah Univ., Cedar City, UT (United States)
  17. Space Science Data Center (SSDC), Rome (Italy)
  18. Clemson Univ., SC (United States)
  19. Universities Space Research Association, Columbia, MD (United States); National Science Foundation (NSF), Alexandria, VA (United States)
  20. Univ. of Warick, Coventry (United Kingdom)
  21. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  22. Stockholm Univ. (Sweden)
  23. Aoyama Gakuin Univ., Kanagawa (Japan)

With the first direct detection of merging black holes in 2015, the era of gravitational wave (GW) astrophysics began. However, a complete picture of compact object mergers requires the detection of an electromagnetic (EM) counterpart. Here, 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).

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1407906
Report Number(s):
LA-UR--17-28358
Journal Information:
Science, Journal Name: Science Journal Issue: 6370 Vol. 358; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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