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One of the most prominent, yet controversial associations derived from theensemble of prompt-phase observations of gamma-ray bursts (GRBs) is theapparent correlation in the source frame between the peak energy Epeak) of thenu-F(nu) spectrum and the isotropic radiated energy, Eiso. Since most gamma-raybursts (GRBs) have Epeak above the energy range (15-150 keV) of the Burst AlertTelescope (BAT) on Swift, determining accurate Epeak values for large numbersof Swift bursts has been difficult. However, by combining data from Swift/BATand the Suzaku Wide-band All-Sky Monitor (WAM), which covers the energy rangefrom 50-5000 keV, for bursts which are simultaneously detected, one canaccurately fit Epeak and Eiso and test the relationship between them for theSwift sample. Between the launch of Suzaku in July 2005 and the end of April2009, there were 48 gamma-ray bursts (GRBs) which triggered both Swift/BAT andWAM and an additional 48 bursts which triggered Swift and were detected by WAM,but did not trigger. A BAT-WAM team has cross-calibrated the two instrumentsusing GRBs, and we are now able to perform joint fits on these bursts todetermine their spectral parameters. For those bursts with spectroscopicredshifts, we can also calculate the isotropic energy. Here we present theresults of joint Swift/BAT-Suzaku/WAM spectral fits for 91 of the burstsdetected by the two instruments. We show that the distribution of spectral fitparameters is consistent with distributions from earlier missions and confirmthat Swift bursts are consistent with earlier reported relationships betweenEpeak and isotropic energy. We show through time-resolved spectroscopy thatindividual burst pulses are also consistent with this relationship.

Testing the Epeak - Eiso relation for GRBs detected by Swift and Suzaku-WAM