Robin Roberts is back on ABCs Good Morning America.  The popular anchorwoman left the morning news program nearly six months ago to begin treatment for a rare blood disorder. Roberts had a bone marrow transplant last September. 

She told her audience this morning that shes thankful and a bit relieved to be back to work on the networks top-rated morning show. 

Doctors believe Roberts came down with the disorder when she was being treated for breast cancer several years ago.