The way of creating User Good Time Intervals is described in the Introduction to the INTEGRAL Data Analysis [1]; a convenient tool gti_user exists for this purpose. To use your own GTI within the JEM-X analysis you should set two parameters: GTI_gtiUser, defining the location of your file, and GTI_TimeFormat defining the time format of the user GTI table. The possible values of the GTI_TimeFormat are IJD for the Integral Julian Date (see Introduction to the INTEGRAL Data Analysis [1]), UTC, and OBT. Below you find an example of the command to launch the JEM-X analysis with the default values and the user GTI table user_gti.fits
jemx_science_analysis startLevel="COR" endLevel="IMA" \ COR_outputExists=y \ DEAD_outputExists=n \ GTI_gtiUser="user_gti.fits[1]" \ GTI_TimeFormat="IJD"