A generalized event selection algorithm for AstroSat CZT imager data

The Cadmium Zinc Telluride (CZT) Imager on board AstroSat is a hard X-ray imaging spectrometer operating in the energy range of 20 $-$ 100 keV. It also acts as an open monitor above keV capable detecting transient events like Gamma-ray Bursts (GRBs). Additionally, instrument has sensitivity to measure polarization 400 for bright on-axis sources Crab and Cygnus X-1 GRBs. As instruments CZTI are sensitive cosmic rays addition X-rays, it required identify remove particle induced or other noise select scientific analysis data. present data pipeline includes algorithms such event selection, but they have certain limitations. They were primarily designed from persistent where source flux much less than background thus not best suited Here, we re-examine characteristics generalized selection method that caters all types sources. efficacy new reviewed by examining Poissonian behavior selected signal ratio