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Cadmium Zinc Telluride Imager (CZTI) aboard AstroSat has been regularlydetecting Gamma-Ray Bursts (GRBs) since its launch in 2015. Its sensitivity topolarization measurements at energies above 100 keV allows CZTI to attemptspectro-polarimetric studies of GRBs. Here, we present the first catalog of GRBpolarization measurements made by CZTI during its first five years ofoperation. This presents the time integrated polarization measurements of theprompt emission of 20 GRBs in the energy range 100-600 keV. The sample includesthe bright GRBs which were detected within an angle range of 0-60 degree and120-180 degree where the instrument has useful polarization sensitivity and isless prone to systematics. We implement a few new modifications in the analysisto enhance polarimetric sensitivity of the instrument. Majority of the GRBs inthe sample are found to possess less / null polarization across the totalbursts' duration in contrast to a small fraction of five GRBs exhibiting highpolarization. The low polarization across the bursts can be speculated to beeither due to the burst being intrinsically weakly polarized or due to varyingpolarization angle within the burst even when it is highly polarized. Incomparison to POLAR measurements, CZTI has detected a larger number of caseswith high polarization. This may be a consequence of the higher energy windowof CZTI observations which results in the sampling of smaller duration of burstemissions in contrast to POLAR, thereby, probing emissions of less temporalvariations of polarization properties.

Hard X-ray polarization catalog for a 5-year sample of Gamma-Ray Bursts using AstroSat CZT-Imager