X-ray light curve of GRS 1739-278 observed with RXTE/PCA. Bin width of each data is 32 seconds. Time 0 of X-axis corresponds to March 31 18:25:39, 1996 (UT). Data gap between Time=~2300-~4800 is due to South Atlantic Anomaly. This light curve includes background counts. The averaged count rate after background subtraction is ~5000 cps in 5 PCUs.