Provide with the observations, it is necessary to reduce the data within a time enough runs to allow the spectroscopic observations which will allow the identification of the objects. These observations on the large telescopes (8m-10m), are in general programmed 2 to 3 days after the observations of research at the time of new moon.
It is thus essential to have a chain of detection preferably fast, robust and automated which makes it possible to reduce the data in quasi real time to satisfy the temporal constraints.
It is accordingly that ToADS (Tools for Analysis and Dectection of Supernovae) by our group was developed in Paris. It is about a modular library C++ of which the various concepts were separate to allow the fast and effective construction of tools for analysis of images of astronomy.
The original motivation of ToADS is the subtraction of images to allow the detection of the supernovæ. In the continuation, we will present the various stages of the reduction which are managed in an automatic way by ToADS.