The Brill-Noether Curve of a Stable Vector Bundle on a Genus Two Curve
  Let U(r) be the moduli space of rank r vector bundles with trivial determinant on a smooth curve of genus 2. The map theta_r: U(r) -> |r Theta|, which associates to a general bundle its theta divisor, is generically finite. In this paper we give a geometric interpretation of the generic fibre of theta_r. 
Sonia Brivio and Alessandro Verra