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Title
Japanese: 
English:In-flight calibration and detector response matrices for WXM/HETE-2 
Author
Japanese: Nakagawa, Y. E., Yamazaki, T., Sakamoto, T., Yoshida, A., 河合 誠之, Tamagawa, T., Shirasaki, Y., Torii, K., Suzuki, M., Matsuoka, M., Fenimore, E. E., Galassi, M., Hete-2 Wxm Team..  
English: Nakagawa, Y. E., Yamazaki, T., Sakamoto, T., Yoshida, A., Kawai, N., Tamagawa, T., Shirasaki, Y., Torii, K., Suzuki, M., Matsuoka, M., Fenimore, E. E., Galassi, M., Hete-2 Wxm Team..  
Language English 
Journal/Book name
Japanese: 
English:Nuovo Cimento C Geophysics Space Physics C 
Volume, Number, Page Vol. 28        pp. 849
Published date July 2005 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1393/ncc/i2005-10171-8
Abstract 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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