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

Nakagawa, Y. E. and Yamazaki, T. and Sakamoto, T. and Yoshida, A. and Kawai, N. and Tamagawa, T. and Shirasaki, Y. and Torii, K. and Suzuki, M. and Matsuoka, M. and Fenimore, E. E. and Galassi, M. (2005) In-flight calibration and detector response matrices for WXM/HETE-2. Il nuovo cimento C, 28 (4\5). pp. 849-852. ISSN 1826-9885

ncc9114.pdf - Published Version

Download (209kB) | Preview
Official URL:


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 25 keV. The detector response matrices (DRMs) of the WXM is calculated numerically based on the preflight 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 (2–4 keV) of theWXM 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.

Item Type: Article
Additional Information: Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004.
Uncontrolled Keywords: X-ray and γ-ray spectrometers
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 18 Mar 2020 11:37
Last Modified: 18 Mar 2020 11:37

Actions (login required)

View Item View Item