projection

Hi,
I have raster imported form map in projection:

Projection : Gauss-Kurger
Ellipsoid : Krassovsky 1938
Central scale : 1.0000
Central meridian : 13 00 E
Origin latitude : 0 00 N
False easting : 500000
False northing : 0

How can I convert it to lat/lon in GRASS?
Is there any command to do that?

Pawel