Importing sun raster files into GRASS

Hi,
  When I import sun raster files into GRASS xy location using r.in.sunrast
the raster image is rotated by about 45 degrees. How do I prevent this (apart
from rotating the resulting image) happening during the import!

  Thankyou very much,
  Laxmi P. Musunur (mlp@forestry.auburn.edu)