  The timing follow-up of newly discovered millisecond pulsars (MSPs) is
hindered by the larger positional uncertainty (a few tens of arc-minutes)
associated with the discovery. In this paper, we present the localization of
two MSPs, discovered by the GMRT High Resolution Southern Sky (GHRSS) survey,
up to arc-second accuracy using a 33~MHz offline coherently dedispersed gated
correlator. This gated correlator is an upgraded version of the earlier 16~MHz
design. This new development with a factor of two enhancement in the observing
bandwidth offers better sensitivity in the image domain, leading to more
precise localization. Aided by the precise position, we followed up these two
MSPs with sensitive phased-array (PA) beams of upgraded GMRT from 300 to 1460
MHz. More sensitive observations in the PA mode for these two MSPs yield
precise ($\sim$ sub-$\mu s$) time-of-arrivals, with DM uncertainties in the
range of $10^{-4}-10^{-5}$ $pc\,cm^{-3}$. We also report the profile evolution
of the two MSPs over 300$-$1460 MHz. Finally, we discuss the suitability of
these MSPs for the pulsar timing array experiments aimed to detect
low-frequency gravitational waves.
