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Proceedings Paper

In-orbit performance of wide-field x-ray monitor on HETE-2
Author(s): Yuji Shirasaki; Nobuyuki Kawai; Atsumasa Yoshida; Toru Tamagawa; Ken'ichi Torii; Takanori Sakamoto; Masaru Matsuoka; Edward E. Fenimore; Mark C. Galassi; Donald Q. Lamb; Carlos Graziani; Tim Q. Donaghy; Roland K. Vanderspek; Makoto Yamauchi; Kunio Tagagishi; Isamu Hatsukade
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Paper Abstract

The Wide-field X-ray Monitor (WXM) is one of the scientific instruments carried on the High Energy Transient Explorer 2 (HETE-2) satellite launched in October 2000. The WXM consists of three elements: (1) four identical Xe-filled one-dimensional position-sensitive proportional counters, two in the spacecraft X-direction and two in the Y-direction, (2) two sets of one-dimensional coded apertures orthogonally mounted above the counters in the X and Y-direction, and (3) the main electronics that processes analog signals from the counters. The WXM counters are sensitive to X-rays between 2 keV and 25 keV within a field-of-view of about 1.5 sr with a total detector area of about 350 cm2. The combination of the apertures and the counters provides GRB locations with accuracy ~10 arcmin. The counters and electronics are developed and fabricated by RIKEN, and the apertures and on-board software are designed and provided by Los Alamos National Laboratory. The WXM plays a major roll in the GRB localization and its spectroscopy in the energy range between 2 keV and 25 keV. During the first year of observations, a number of steady X-ray sources as well as high-energy transients were detected with the WXM. Observing Crab nebula and Sco X-1, we have calibrated the detector alignment between the WXM and the optical camera system with 2 arcmin accuracy. As of 29 July 2002, nineteen GRBs have been localized with the WXM in the 18 months of stable operations. Twelve of them were reported to the GCN within a delay of 10 hours, and 4 optical transients were identified by ground based telescopes. The energy response of the detectors has also been calibrated using the Crab spectrum. We report the in-orbit performance of the WXM instrument during the first 18 months.

Paper Details

Date Published: 11 March 2003
PDF: 10 pages
Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461414
Show Author Affiliations
Yuji Shirasaki, National Space Development Agency of Japan (Japan)
RIKEN-The Institute of Physical and Chemical Research (Japan)
Nobuyuki Kawai, Tokyo Institute of Technology (Japan)
RIKEN-The Institute of Physical and Chemical Research (Japan)
Atsumasa Yoshida, Aoyama Gakuin Univ. (Japan)
RIKEN-The Institute of Physical and Chemical Research (Japan)
Toru Tamagawa, RIKEN-The Institute of Physical and Chemical Res (Japan)
Ken'ichi Torii, National Space Development Agency of Japan (Japan)
Takanori Sakamoto, RIKEN-The Institute of Physical and Chemical Research (Japan)
Tokyo Institute of Technology (Japan)
Los Alamos National Lab. (United States)
Masaru Matsuoka, National Space Development Agency of Japan (Japan)
Edward E. Fenimore, Los Alamos National Lab. (United States)
Mark C. Galassi, Los Alamos National Lab. (United States)
Donald Q. Lamb, Univ. of Chicago (United States)
Carlos Graziani, Univ. of Chicago (United States)
Tim Q. Donaghy, Univ. of Chicago (United States)
Roland K. Vanderspek, Massachusetts Institute of Technology (United States)
Makoto Yamauchi, Miyazaki Univ. (Japan)
Kunio Tagagishi, Miyazaki Univ. (Japan)
Isamu Hatsukade, Miyazaki Univ. (Japan)


Published in SPIE Proceedings Vol. 4851:
X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy
Joachim E. Truemper; Harvey D. Tananbaum, Editor(s)

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