  The soft gamma-ray telescope ECLAIRs with its Scientific Trigger Unit is in
charge of detecting Gamma-Ray Bursts (GRBs) on-board the future SVOM satellite.
Using the "scientific software model" (SSM), we study the efficiency of both
implemented trigger algorithms, the Count-Rate Trigger for time-scales below
20s and the Image Trigger for larger ones. The SMM provides a simulation of
ECLAIRs with photon projection through the coded-mask onto the detection plane.
We developed an input GRB database for the SSM based on GRBs light curves
detected by the Fermi GBM instrument. We extrapolated the GRB spectra into the
ECLAIRs band (4-120 keV) and projected them onto the detection plane,
superimposed with cosmic extragalactic background photons (CXB). Several
simulations were performed by varying the GRB properties (fluxes and positions
in the field of view). We present first results of this study in this paper.
