  The remnant of supernova explosion is widely believed to be the acceleration
site of high-energy cosmic ray particles. The acceleration timescale is,
however, typically very long. Here we report the detection of a variable
$\gamma$-ray source with the Fermi Large Area Telescope, which is positionally
and temporally consistent with a peculiar supernova, iPTF14hls. A quasi-stellar
object SDSS J092054.04+504251.5, which is probably a blazar according to the
infrared data, is found in the error circle of the $\gamma$-ray source. More
data about the $\gamma$-ray source and SDSS J092054.04+504251.5 are needed to
confirm their association. On the other hand, if the association between the
$\gamma$-ray source and the supernova is confirmed, this would be the first
time to detect high-energy $\gamma$-ray emission from a supernova, suggesting
very fast particle acceleration by supernova explosions.
