RX J0640-24 outburst Double outburst. Precursor + superoutburst? YYYYMMDD(UT) mag observer 20010517.699 <145 (B. Monard) 20010519.690 <145 (B. Monard) 20010520.687 <140 (B. Monard) 20010521.699 <138 (B. Monard) 20010525.385 <135 (R. Stubbings) 20010525.708 120 (B. Monard) 20010526.690 116 (B. Monard) 20010527.681 129 (B. Monard) 20010528.419 <124 (R. Stubbings) 20010529.680 <132 (B. Monard) 20010531.394 <128 (R. Stubbings) 20010607.676 114 (B. Monard)