  Pachmarhi Array of \v{C}erenkov Telescopes (PACT), based on wavefront
sampling technique, has been used for detecting TeV gamma rays from galactic
and extra-galactic $\gamma $-ray sources. The Blazar, Mkn 421 was one such
extra-galactic source observed during the winter nights of 2000 and 2001. We
have carried out a preliminary analysis of the data taken during the nights of
January, 2000 and 2001. Results show a significant gamma ray signal from this
source during both these periods above a threshold energy of 900 GeV. The
source was contemporaneously observed by CAT imaging telescope during the first
episode of January 2000 while HEGRA CT1 was observing the source during the
second episode. Both these observations have detected variable $\gamma $-ray
emission this source and they reported that it was flaring during both these
periods. The light curve in the TeV gamma ray range derived from the first PACT
observations during both these episodes is in agreement with that reported by
other experiments. The analysis procedure and the preliminary results will be
presented and discussed.
