We have observed the DEEP2 galaxies using the Giant Meterwave Radio Telescope in the frequency band of 610 MHz .
There are \simeq 400 galaxies in the redshift range 1.24 < z < 1.36 and within the field of view \simeq 44 ^ { \prime } , of the GMRT dishes .
We have coadded the HI 21 cm-line emissions at the locations of these DEEP2 galaxies .
We apply stacking on three different data cubes : primary beam uncorrected , primary beam corrected ( uniform weighing ) and primary beam corrected ( optimal weighing ) .
We obtain a peak signal strength in the range 8 \hbox { - - } 25 \mu Jy/beam for a velocity width in the range 270 \hbox { - - } 810 km sec ^ { -1 } .
The error on the signal , computed by bootstrapping , lies in the range 2.5 \hbox { - - } 6 \mu Jy/beam , implying a 2.5–4.7- \sigma detection of the signal at z \simeq 1.3 .
We compare our results with N-body simulations of the signal at z \simeq 1 and find reasonable agreement .
We also discuss the impact of residual continuum and systematics .