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The Cadmium Zinc Telluride (CZT) Imager onboard AstroSat, consists ofpixelated CZT detectors, which are sensitive to hard X-rays above 20 keV. Theindividual pixels are triggered by ionising events occurring in them, and thedetectors operate in a self-triggered mode, recording each event separatelywith information about its time of incidence, detector co-ordinates, andchannel that scales with the amount of ionisation. The detectors are sensitivenot only to photons from astrophysical sources of interest, but also prone to anumber of other events like background X-rays, cosmic rays, and noise indetectors or the electronics. In this work a detailed analysis of the effect ofcosmic rays on the detectors is made and it is found that cosmic rays cantrigger multiple events which are closely packed in time (called 'bunches').Higher energy cosmic rays, however, can also generate delayed emissions, asignature previously seen in the PICsIT detector on-board INTEGRAL. Analgorithm to automatically detect them based on their spatial clusteringproperties is presented. Residual noise events are examined using examples ofGamma Ray Bursts as target sources.

Characterisation of Cosmic Ray Induced Noise Events in AstroSat-CZT Imager