The systematic error test for PSF correction in weak gravitational
  lensing shear measurement by The ERA Method by Idealizing PSF
  We improve the ERA(Ellipticity of Re-smeared Artificial image) method of
PSF(Point Spread Function) correction in weak lensing shear analysis in order
to treat realistic shape of galaxies and PSF. This is done by re-smearing PSF
and the observed galaxy image smeared by a RSF(Re-Smearing Function), and
allows us to use a new PSF with a simple shape and to correct PSF effect
without any approximations and assumptions. We perform numerical test to show
that the method applied for galaxies and PSF with some complicated shapes can
correct PSF effect with systematic error less than 0.1%. We also apply ERA
method for real data of Abell 1689 cluster to confirm that it is able to detect
the systematic weak lensing shear pattern. The ERA method requires less than
0.1 or 1 second to correct PSF for each object in numerical test and real data
analysis, respectively.
