  The T2K long-baseline neutrino oscillation experiment has produced the first
observation of $\nu_{e}$ appearance and the most precise measurement of the
mixing angle $\theta_{23}$ from $6.57 \times 10^{20}$ protons-on-target (POT)
of neutrino beam data. We present here the results of T2K antineutrino
oscillation analyses searching for $\bar{\nu}_{e}$ appearance and measuring the
dominant oscillation parameters for $\bar{\nu}_{\mu}$ disappearance, including
the results from the T2K near detector fit. Using $4.01 \times 10^{20}$ POT of
antineutrino beam data T2K measured $\sin^{2}(\bar{\theta}_{23}) =
0.45^{+0.29}_{-0.12}$ and $|\Delta \bar{m}^{2}_{32}| = 2.51\pm0.28 \times
10^{-3} (eV^{2})$, consistent with previous existing $\nu_{\mu}$ and
$\bar{\nu}_{\mu}$ disappearance measurements. From the same dataset 3
$\bar{\nu}_{e}$ candidate events were selected at the far detector, which did
not provide evidence either for or against the $\bar{\nu}_{e}$ appearance
hypothesis.
