Accurate analytic formula for light bending in Schwarzschild metric
  We propose new analytic formulae describing light bending in Schwarzschild
metric. For emission radii above the photon orbit at 1.5 Schwarzschild radius,
the formulae have an accuracy of better than 0.2% for the bending angle and 3%
for the lensing factor for any trajectories that turn around a compact object
by less than about 160 deg. In principle, they can be applied to any emission
point above the horizon of the black hole. The proposed approximation can be
useful for problems involving emission from neutron stars and accretion discs
around compact objects when fast accurate calculations of light bending are
required. It can also be used to test the codes that compute light bending
using exact expressions via elliptical integrals.
