The Old Host-Galaxy Environment of SSS17a, the First Electromagnetic Counterpart to a Gravitational Wave Source

  title={The Old Host-Galaxy Environment of SSS17a, the First Electromagnetic Counterpart to a Gravitational Wave Source},
  author={Y.-C. Pan and Charles D. Kilpatrick and Joshua D. Simon and Enia Xhakaj and Konstantina Boutsia and David A. Coulter and Maria R. Drout and Ryan J. Foley and Daniel Kasen and Nidia I. Morrell and Ariadna Murguia-Berthier and David James Osip and Anthony L. Piro and Jason Xavier Prochaska and Enrico Ramirez-Ruiz and Armin Rest and C{\'e}sar Rojas-Bravo and Benjamin. J. Shappee and Matthew R. Siebert},
  journal={arXiv: Astrophysics of Galaxies},
We present an analysis of the host-galaxy environment of Swope Supernova Survey 2017a (SSS17a), the discovery of an electromagnetic counterpart to a gravitational wave source, GW170817. SSS17a occurred 1.9 kpc (in projection; 10.2") from the nucleus of NGC 4993, an S0 galaxy at a distance of 40 Mpc. We present a Hubble Space Telescope (HST) pre-trigger image of NGC 4993, Magellan optical spectroscopy of the nucleus of NGC 4993 and the location of SSS17a, and broad-band UV through IR photometry… 

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