RHESSI Spectral Fits of Swift GRBs

Understand

One of the challenges of the Swift era has been accurately determining Epeak for the prompt GRB emission.

• RHESSI, which is sensitive from 30 keV to 17 MeV, can extend spectral coverage above the Swift-BAT bandpass.
• Using the public Swift data, we present results of joint spectral fits for 26 bursts co-observed by RHESSI and Swift-BAT through May 2007.
• We compare these fits to estimates of Epeak which rely on BAT data alone.