GX Cas superhump detection Dear Colleagues, The observations on Oct. 20 (Uemura and Kato) clearly indicates the presense of superhumps with an amplitude slightly less than 0.1 mag, superimposed on the general relatively rapid fading. This may suggest the early appearance of superhumps, just preceding the final rise to superoutburst. Observations are strongly urged. Regards, Taichi Kato and Makoto Uemura