RXJ0643.9-2052 recent (cont'd) YYYYMMDD(UT) mag observer 20010212.544 <153 (A. Pearce) 20010213.547 <153 (A. Pearce) 20010216.508 <140 (R. Stubbings) 20010217.490 <144 (R. Stubbings) 20010220.456 <142 (R. Stubbings) 20010226.546 <152 (A. Pearce) 20010227.550 <152 (A. Pearce) 20010301.496 <140 (R. Stubbings) 20010302.483 <142 (R. Stubbings) 20010303.528 <148 (A. Pearce) 20010310.594 <144 (A. Pearce) 20010311.548 <148 (A. Pearce)