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Determine the flux sensitivity in a given energy band for a given instrument of the Athena X-ray mission as a function of exposure time. The simulations can be done either running the jupyter notebook from the command line or executing (cell-by-cell) the jupyter-notebook Athena_Xray_flux_vs_expTime.ipynb. The steps followed are: 1. Importing libraries 2. Defining input parameters, derived parameters and Xspec parameters 3. Gettting background count rate in the reference band normalized to the source area 4. Determining counts, flux (cgs units; erg cm-2 s-1), confusion flux (cgs), optimum extraction flux (cgs) & optimum extraction radius (arcsec) in the reference band over a loop of exposure times 5. Output file with results: the information provided by the output file comprises: Time_s, Flux_cgs, Flux_confusion_cgs, FluxOptimumExtraction cgs & RadiusOptimumExtraction_arcsec 6. Plotting limiting sensitivity vs exposure time.