Galactic Bulge microlensing optical depth from EROS-2

TLDR: In this paper, a new EROS-2 measurement of the optical depth toward the Galactic Bulge was presented, with light curves of $5.6\times 10^{6}$ clump-giant stars distributed over $66 \deg^2$ of the Bulge during seven Bulge seasons.

Abstract: We present a new EROS-2 measurement of the microlensing optical depth toward the Galactic Bulge. Light curves of $5.6\times 10^{6}$ clump-giant stars distributed over $66 \deg^2$ of the Bulge were monitored during seven Bulge seasons. 120 events were found with apparent amplifications greater than 1.6 and Einstein radius crossing times in the range $5 {\rm d}