Radio light curve of the galaxy possibly associated with FRB150418
  We present observations made with the Australia Telescope Compact Array
(ATCA), the Jansky Very Large Array (JVLA) and the Giant Metre-Wave Telescope
of the radio source within the galaxy WISE~J071634.59-190039.2, claimed to be
host of FRB~150418 by Keane et al. (2016). We have established a common flux
density scale between the ATCA and JVLA observations, the main result of which
is to increase the flux densities obtained by Keane et al. At a frequency of
5.5 GHz, the source has a mean flux density of 140uJy and is variable on short
timescales with a modulation index of 0.36. Statistical analysis of the flux
densities shows that the variations seen are consistent with refractive
interstellar scintillation of the weak active galactic nucleus at the centre of
the galaxy. It may therefore be the case that the FRB and the galaxy are not
associated. However, taking into account the rarity of highly variable sources
in the radio sky, and our lack of knowledge of the progenitors of FRBs as a
class, the association between WISE~J071634.59-190039.2 and FRB~150418 remains
a possibility.
