  A radio-emitting tidal disruption event (AT2019dsg) is proposed as a likely
counterpart of the IceCube neutrino event IC-191001A. In this work we have
revisited the {\it Fermi}-LAT data in the direction of the neutrino and
confirmed no signal at the site of AT2019dsg. Instead, at the edge of the 90\%
confidential level error region of this neutrino there is a $\gamma$-ray
transient source associated with a blazar GB6 J2113+1121. In May 2019, GB6
J2113+1121 was undergoing an unprecedented $\gamma$-ray flare since the start
of the {\it Fermi}-LAT operation, with a variability amplitude about 20-fold.
Similar violent flares of GB6 J2113+1121, unobserved before, have been also
detected observed in optical bands. Moreover, the blazar remained in a high
flux state in the infrared bands when IceCube-191001A arrived, though its
$\gamma$-ray and optical activities has temporally ceased. Motivated by the
spatial and temporal coincidence, we suggest that GB6 J2113+1121 is a candidate
of the counterpart of IC-191001A. The jet properties of GB6 J2113+1121 are
investigated, which are found to be comparable with that of the
neutrino-emitting blazars (candidates). A specific analysis of archival IceCube
data in this direction and future observations would put a further constraint
on the origin of the neutrino.
