Abstract. The BATSE gamma-ray burst spectroscopy team has developed a spectral fitting software package optimized for high-energy astrophysics applications. The package, called WINGSPAN (for WINdowing Gamma-ray SPectral ANalysis), operates in a standard windowing environment on time-sequences of spectra stored in the portable FITS format. Separate windows display the temporal rate history and corresponding energy spectrum and allow convenient interactive visual selection of all background, source, temporal and energy ranges. WINGSPAN also uses a highly efficient fitting engine that has been optimized to operate in both the Gaussian and Poisson statistical regimes. Besides being able to rapidly fit large numbers of spectra in sequence, WINGSPAN is able to jointly fit time-resolved spectra from many different detectors and/or instruments.

Recent results obtained using WINGSPAN will be described, including the BATSE Spectroscopy Catalog and several investigations comparing the observations with predictions of the synchrotron shock model for gamma ray bursts.

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