In-flight calibration and detector response matrices for WXM/HETE-2

Details In-flight calibration and detector response matrices for WXM/HETE-2 In-flight calibration and detector response matrices for WXM/HETE-2

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ncimc..28..849n&link_type=abstract

Il Nuovo Cimento C, vol. 28, Issue 4, p.849

Physics

3

Scientific paper

The HETE-2 carries the Wide-field X-ray Monitor (WXM) which consists of four identical one-dimensional position-sensitive proportional counters and the electronics for signal processing. It is placed beneath two one-dimensional coded aperture masks and sensitive to X-rays from 2 to 25keV. The detector response matrices (DRMs) of the WXM is calculated numerically based on the pre-flight ground measurements for each anode wire. Since the launch of HETE-2, in-flight calibrations have been carried out utilizing data of Crab nebula. An unexpected excess appeared in low energy spectra (2-4keV) of the WXM since December 2002. We found the excess being on an increasing trend. It is possibly explained by a gradual loss of the aluminum-coated Kapton film which covers the coded masks. We developed the new DRMs generator based on the variation of the thickness of aluminum-coated Kapton film.

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