Distances to Supernova Remnants G$20.4+0.1$, G$24.7-0.6$ and G$28.6-0.1$
  and New Molecular Cloud Associations
  Accurate distances to supernova remnants (SNRs) are crucial in determining
their size, age, luminosity and evolutionary state. To determine distances, we
chose three SNRs from the VLA Galactic Plane Survey (VGPS) for extraction of HI
absorption spectra. Analysing HI absorption spectra, $^{13}$CO emission
spectra, and HI and $^{13}$CO channel maps, kinematic velocities (or their
limits) to the three SNRs were calculated. The three SNRs are probably
associated with molecular clouds and the new distance to G$20.4+0.1$,
G$24.7-0.6$ and G$28.6-0.1$ are $7.8 \pm0.5$ kpc, $3.8\pm 0.2 $ kpc and $ 9.6
\pm 0.3 $ kpc, respectively.
