Step 1 : Choose the instrument.

IBIS SPI

Step 2 : Enter source energy information.

Enter minimum and maximum source continuum energies and power-law slope.

Emin (keV): Emax (keV): Photon index:

OR
Enter line parameters.

Line energy (keV): Line FWHM (keV):

Step 3 : Enter choice of Signal or Time Estimation and enter value.

Calculate the exposure time needed to achieve this signal to noise:
OR
Calculate the signal to noise ratio available in this exposure time (ksec):

Step 4 : Define the source.

Source Flux (photons/sec/cm²):
Source RA (deg or HH:MM:SS): Source Dec (deg or DD:MM:SS):

Step 5 : Set the dithering pattern of the observation.

Staring Hexagonal pattern 5 X 5 pattern

Step 6