A Mildly Relativistic Outflow from the Energetic, Fast-rising Blue Optical Transient CSS161010 in a Dwarf Galaxy

@article{Coppejans2020AMR,
  title={A Mildly Relativistic Outflow from the Energetic, Fast-rising Blue Optical Transient CSS161010 in a Dwarf Galaxy},
  author={Deanne L. Coppejans and Raffaella Margutti and Giacomo Terreran and A. J. Nayana and Eric R. Coughlin and Tanmoy Laskar and Kate D. Alexander and Michael F. Bietenholz and Damiano Caprioli and Poonam Chandra and Maria R. Drout and Dmitry D. Frederiks and Chris Frohmaier and Kevin Hurley and Christopher S. Kochanek and Morgan MacLeod and Aaron M. Meisner and Peter E. Nugent and Anna Ridnaia and David J. Sand and Dmitry S. Svinkin and Charlotte Ward and S. Yang and Adriano Baldeschi and Igor V. Chilingarian and Y. Dong and Carlo M. Esquivia and Wen-fai Fong and C. Guidorzi and Peter Lundqvist and Dan Milisavljevic and Kerry Paterson and Daniel E. Reichart and Benjamin. J. Shappee and Michael C. Stroh and Stefano Valenti and B. Ashley Zauderer and B. Zhang},
  journal={arXiv: High Energy Astrophysical Phenomena},
  year={2020}
}
We present X-ray and radio observations of the Fast Blue Optical Transient (FBOT) CRTS-CSS161010 J045834-081803 (CSS161010 hereafter) at t=69-531 days. CSS161010 shows luminous X-ray ($L_x\sim5\times 10^{39}\,\rm{erg\,s^{-1}}$) and radio ($L_{\nu}\sim10^{29}\,\rm{erg\,s^{-1}Hz^{-1}}$) emission. The radio emission peaked at ~100 days post transient explosion and rapidly decayed. We interpret these observations in the context of synchrotron emission from an expanding blastwave. CSS161010 launched… 

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