Q:  A typical GRB emits most of its energy at
       a wavelength of very roughly 0.02 nm.
       If you use the blackbody approximation to
       estimate its temperature, what do you conclude?


                     2,900,000  nm * K       0.29   cm * K
           Temp  =  -------------------  =  ----------------
                     peak wavelength         peak wavelength


                     2,900,000 nm * K
                 =   -----------------
                        0.02 nm


                 =   145 million K