1. Introduction

2. Method
2.1. Transit fitting
2.2. Transit parameters
2.3. MCMC

3. Tests on synthetic lightcurves

4. Tests on candidates in the CoRoT IRa01 field
4.1. The data set
4.2. Pre-cleaning of the lightcurves
4.3. Fitting the lightcurves

5. Discussion

6. Conclusions