This program generates all GTIs for one instrument that depend on HK and other parameters and are defined by a limit in a limit table, see details in Section . In ISGRI case it creates VETO GTIs during which VETO was switched on, and ISGRI_MCE7X (where X varies from 0 to 7) GTIs during which the Xth module was switched on. VETO GTIs are taken into account by gti_merge executable (see Section ), and ISGRI_MCE7X GTIs are taken into account later during BIN_I, BIN_S and BIN_T levels.