BVRI Photometry of SN 2016coj in NGC 4125
  We present BVRI photometry of supernova (SN) 2016coj in NGC 4125 from $9$
days before to $57$ days after its $B$-band maximum light. Our light curves and
color curves suggest that this event belongs to the "normal" class of type Ia
SNe, with a decline rate parameter $\Delta m_{15}(B) = 1.32 \pm 0.10$, and that
it suffers little extinction. Adopting a distance modulus to its host galaxy of
$(m - M) = 31.89$ mag, we compute extinction-corrected peak absolute magnitudes
of $M_B = -19.01$, $M_V = -19.05$, $M_R = -19.03$, and $M_I = -18.79$. The
explosion occurred close enough to the nucleus of NGC 4125 to hinder the
measurement of its brightness. We describe our methods to reduce the effect of
such host-galaxy contamination, but it is clear that our latest values suffer
from systematic bias.
