Two new comets have been discovered by A. R. Gibbs, using the 0.68 meter CCD Schmidt telescope of the Catalina Sky Survey. The preliminary orbital elements of the comet C/2007 T4 (Gibbs), discovered on October 12, 2007, indicate a perihelion passage on August 11, 2007 at a distance of 2.2 AU from the Sun. The preliminary orbital elements of the comet C/2007 T5 (Gibbs), discovered on October 13, 2007, indicate a perihelion passage on February 13, 2008 at a distance of 4,4 AU from the Sun.
