RHESSI Spectral Fits of Swift GRBs

Abstract

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. A Bayesian Epeak estimator gives better correspondence with our measured results than an estimator relying on correlations with the Swift power law indices.

arXiv comment4 pages, 1 figure. To appear in the proceedings of Gamma Ray Bursts 2007, Santa Fe, New Mexico, November 5-9 2007

References in corpus (3)

• GRB Radiative Efficiencies Derived from the Swift Data: GRBs vs. XRFs, Long vs. Short
• A Complete Catalog of Swift GRB Spectra and Durations: Demise of a Physical Origin for Pre-Swift High-Energy Correlations
• Making a Short Gamma-Ray Burst from a Long one: Implications for the Nature of GRB 060614

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• The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows
• The Cosmic Rate, Luminosity Function and Intrinsic Correlations of Long GRBs
• Generalized Tests for Selection Effects in GRB High-Energy Correlations
• Observations of the Prompt Gamma-Ray Emission of GRB 070125
• RHESSI Tests of Quasi-Thermal Gamma-Ray Burst Spectral Models
• Study of shock wave dynamics produced by interaction of a fireball with the surrounding medium to it, to explain the x-ray afterglow of Gamma Ray Burst-GRBs