We lay out from now on lightcurves of our supernovæ. The stage according to consists in passing in the system standard magnitudes. Appendix A describes in detail how the system magnitude is built. We will be satisfied here to describe how starting from the calibrations obtained by the personnel of the CFHT (J-C Cuillandre and E Magnier) and by our collaborators of SCP (R. Knop), we gauged the lightcurves built on the ground. The calibration of the space lightcurves will be presented in the next chapter.
Initially, we will describe which are the images which were used as primary education calibrator. We will describe then how the calibration was propagated towards our images of photometric reference. Then, we will describe how the corrections of color were applied making it possible to express our magnitudes in a standard system.
Lastly, we will detail how the procedure of calibration using fiducial objects was checked present at the same time in the images on the ground and images HST.