Point spread function and centroiding accuracy measurements with the JET-X mirror and MOS CCD detector of the Swift gamma ray burst explorer's X-ray telescope - Ambrosi, R.M.; Abbey, A.F.; Hutchinson, I.B.; Willingale, R.; Wells, A.; Short, A.D.T.; Campana, S.; Citterio, O.; Tagliaferri, G.; Burkert, W.; Brauninger, H. (Nuclear Instruments & Methods in Physics Research Section A, 2002)