Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stin...0268829p&link_type=abstract
Research Reports: 2001 NASA/ASEE Summer Faculty Fellowship Program, p. XLI XLI
Astronomy and Astrophysics
Astronomy
Gamma Ray Astronomy, Gamma Ray Observatory, Gamma Ray Bursts, Gamma Ray Spectrometers, Bremsstrahlung, Satellite Instruments, Astronomical Spectroscopy
Scientific paper
Gamma-ray bursts (GRBs) are energetic, short-duration emissions of gamma-rays from astronomical sources typically well beyond our galaxy. The Burst and Transient Source Experiment (BATSE) that was onboard NASA's Compton Gamma-Ray Observatory (CGRO) had detected an unprecedented 2704 GRBs during CGRO's nine-year mission. BATSE consisted of eight detector assemblies located at the corners of CGRO to give full sky coverage. Each assembly consisted of two detectors, a Large Area Detector (LAD) and a Spectroscopy Detector (SD). In determining the detail features of GRBs, the degree to which they possess a low-energy component (approx. 10 keV) is of interest. Preece has developed a method to study the low-energy characteristics and concluded that 14% of the 86 bright GRBs they studied had a definite low-energy component, referred to as a low-energy excess. Their study, and the present study as well, needed to use SD data, because it extends down to the low-energy range when operating in a high-gain mode. For their study, low-energy data was used from just one SD. To better quantify the low-energy behavior, this study will consider bursts for which two SDs satisfy the same criteria as used by Preece. The procedure developed by Preece to study the low-energy aspects of GRBs with BATSE data is to fit the data to a representative spectral function. In particular, two components are used, one corresponding to the low-energy component, and another representing the main part of the spectrum. The low-energy function used is the optically thin thermal bremsstrahlung (OTTB) model.
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