Degeneracies in Sky Localisation Determination from a Spinning   Coalescing Binary through Gravitational Wave Observations: a Markov-Chain   Monte-Carlo Analysis for two Detectors
  Gravitational-wave signals from inspirals of binary compact objects (black holes and neutron stars) are primary targets of the ongoing searches by ground-based gravitational-wave interferometers (LIGO, Virgo, and GEO-600). We present parameter-estimation simulations for inspirals of black-hole--neutron-star binaries using Markov-chain Monte-Carlo methods. As a specific example of the power of these methods, we consider source localisation in the sky and analyse the degeneracy in it when data from only two detectors are used. We focus on the effect that the black-hole spin has on the localisation estimation. We also report on a comparative Markov-chain Monte-Carlo analysis with two different waveform families, at 1.5 and 3.5 post-Newtonian order. 
V. Raymond, M.V. van der Sluys, I. Mandel, V. Kalogera, C. Roever, N.   Christensen