Did GW150914 produce a rotating gravastar

@article{Chirenti2016DidGP,
  title={Did GW150914 produce a rotating gravastar},
  author={Cecilia Chirenti and Luciano Rezzolla},
  journal={Physical Review D},
  year={2016},
  volume={94},
  pages={084016}
}
The interferometric LIGO detectors have recently measured the first direct gravitational-wave signal from what has been interpreted as the inspiral, merger and ringdown of a binary system of black holes. The signal-to-noise ratio of the measured signal is large enough to leave little doubt that it does refer to the inspiral of two massive and ultracompact objects, whose merger yields a rotating black hole. Yet, the quality of the data is such that some room is left for alternative… 

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