Timing Analysis of Unusual GRB 090709A Observed by Suzaku Wide‐band All sky Monitor

A result of a joint timing analysis is presented for prompt emission of long‐duration $(T90 = 81 s)$ GRB 090709A with Swift Burst Alert Telescope (Swift/BAT), Suzaku Wide‐band All‐sky Monitor (Suzaku/WAM) and Konus‐Wind over an energy range from 15 keV to 5 MeV. It was reported that multi‐peaked GRB 090709A exhibited a possible periodic behavior with a period of about 8 s which is comparable to typical time scale of soft gamma‐ray repeaters. However, the periodicity is still marginal in detailed analysis with Swift/BAT and GRB090709A exhibited a typical afterglow[1] [2]. To investigate significance of the periodicity more quantitatively, we performed a detailed timing analysis on all the lightcurves obtained with Suzaku/WAM, Swift/BAT, and Konus‐Wind evaluating their underlying trend, red noise and white noise.