We present results of a search for variable stars in a region of the globular cluster NGC 4147 based on photometric observations with 4KX4K CCD imager mounted at the axial port of the recently installed 3.6 m Devasthal optical telescope at Aryabhatta Research Institute of Observational Sciences, Nainital, India.
We performed time series photometry of NGC 4147 in V and R filters. We have identified 42 periodic
variables in the region of NGC 4147, 28 of which have been detected for the first time. A total of 11 variables are located in the central, crowded region of the cluster. Based on the location in the V/(V-R)colour magnitude diagram 9 horizontal branch stars are identified and these could be probably RR Lyrae variables. Two stars with periods < 0.15 days can be classified as X Phe stars. We have also detected 12 red giant branch stars as variables. The physical parameters of a total 23 identified RR Lyrae variables have been determined using their light curves with the help of Fourier decomposition.