Bimodal distribution in durations 100 ◇ BATSE ■SAX 8:8- ◇ 9888 ◇ sW 8 80608 ◇◇◇ ◇8:∞3 8◇ ◇ ◇◇■ shor long 2 S 001 01 90%Width 10 100 1000Bimodal distribution in durations shor t long 2 s