  For a non-negative integer $m$, let $S(m)$ denote the sum given by
$$S(m):=\sum_{n=0}^{m}\frac{(-1)^n(8n+1)}{n!^3}\left(\frac{1}{4}\right)_n^3.$$
Using the powerful WZ-method, for a prime $p\equiv 3$ $($mod $4)$ and an odd
integer $r>1$, we here deduce a supercongruence relation for
$S\left(\frac{p^r-3}{4}\right)$ in terms of values of $p$-adic gamma function.
As a consequence, we prove one of the supercongruence conjectures of (F.3)
posed by Swisher. This is the first attempt to prove supercongruences for a sum
truncated at $\frac{p^r-(d-1)}{d}$ when $p^r\equiv -1$ $($mod $d)$.

Number Theory