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Performance of Wide-field X-ray Monitor on board HETE (High-Energy Transient Experiment)

The wide-field x-ray monitor (WXM) is one of the three scientific instruents onboard high energy transient experiment (HETE) satellite, which was launched in 1996. The primary objective of HETE is to carry out the first multi- wavelength study of gamma-ray bursts with UV, x-ray, and gamma-ray instruments mounted on a single, compact spacecraft. WXM has been designed to undertake comprehensive x-ray spectra observations and quickly determine small error boxes of GRB locations within a large field of view of about 1.5 steradian. It is based on the principle of coded aperture imaging. It has four identical one-dimensional position sensitive proportional counters (PSPCs), one pair in each of two orthogonal directions. Each PSPC is filled with 1.4 atm Xe (97%) and CO2 (3%), equipped with three resistive carbon anodes of 10 micrometer diameter, and sensitive to x-rays between 2 and 25 keV. It provides position resolution of about 1.0 mm (FWHM), and energy resolution of about 17% (FWHM) at 8 keV.