X-ray Swift observations of SN 2018cow
  Supernova (SN) 2018cow (or AT2018cow) is an optical transient detected in the
galaxy CGCG 137-068. It has been classified as a SN due to various
characteristics in its optical spectra. The transient is also a bright X-ray
source. We present results of the analysis of ~62ks of X-ray observations taken
with the Neil Gehrels Swift Observatory over 27 days. We found a variable
behavior in the 0.3-10 keV X-ray light curve of SN 2018cow, with variability
timescales of days. The observed X-ray variability could be due to the
interaction between the SN ejecta and a non-uniform circumstellar medium,
perhaps related to previous mass ejections from a luminous-blue-variable-like
progenitor.
