the upgrade work. New CPCs with square entry and circular exit aperture were installed on the $TACTIC$ imaging camera in order to increase its photon collection efficiency. The collection efficiency of the new CPCs was measured to be about 80$\%$ in the wavelength range 400–550 nm. Apart from removing the dead space in between the photomultipliers substantially, the new CPCs has also helped us to improve the gamma/hadron segregation capability of the telescope. In addition, the trigger criteria was also modified by including more nearest neighbor collinear triplet combinations. A dedicated CCD camera was also installed for conducting detailed point run calibrations and data collected were successfully used for determining the position of the source in the image plane with an accuracy better than $\pm$ 3 arc min. The point run calibration data (i.e. position of the star image in the camera) were also incorporated in the analysis software so that appropriate corrections can be applied in an off line manner while calculating source position dependent image parameters. The analysis procedure was improved by using the Asymmetry parameter so that additional hadronic background can be further removed by identifying the “head/tail” feature of Cherenkov images. It is worth mentioning here 