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Proceedings Paper

Hu-ring: a small university satellite for gamma-ray burst
Author(s): Nobuyuki Kawai; Hideto Okada; Naoki Miyashita; Tomoyuki Urabe ; M. Kashiwa; T. Tachikawa; N. Yamaguchi; Kuniyuki Omagari; I. Morita; Yoshihisa Yamamoto; Yoichi Yatsu; Tomoko Ikagawa; Jun Kataoka; Saburo Matunaga
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Paper Abstract

We propose a university-class micro-satellite "Hu-ring" to localize and study gamma-ray bursts. The primary mission of "Hu-ring" is to localize gamma-ray bursts with an 10 arcmin accuracy in real time, and transmit promptly the coordinates to the ground. Although many of its mission concepts are modeled after HETE-2, use of avalanche photodiodes (APDs), innovative photon detector device, make it possible to further reduce the size and the mass of the satellite. We designed "Hu-ring" within a size of 50 cm cube and a weight limit of 50 kg, so that it can be launched as a piggy-back payload of the Japanese H-IIA Launch Vehicle. The satellite is spin-stabilized, and has a half-sky field of view centered on the anti-sun direction. A set of scintillation counters equipped with rotation modulation collimators are employed for localization of GRBs. We also measure the soft/medium X-ray spectra of GRBs using APDs as a direct X-ray photon detectors. These two kinds of instruments cover the 0.5--200 keV energy range. The satellite bus is designed mostly with commercially available components in order to reduce the cost and the lead time. Following the HETE-2 model, in order to receive the prompt burst alerts it is designed to rely on a global network of receive-only low-cost ground stations, which may be hosted at research instutions with a small footprint. We performed analyses in many aspects: mechanical and thermal design of the satellite bus, attitude control simulations, power budget, ground contact schedule and downlink capacity, etc. We verified that the mission goal can be achieved with this proposed design philosophy.

Paper Details

Date Published: 11 October 2004
PDF: 10 pages
Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.550848
Show Author Affiliations
Nobuyuki Kawai, Tokyo Institute of Technology (Japan)
Hideto Okada, Tokyo Institute of Technology (Japan)
Naoki Miyashita, Tokyo Institute of Technology (Japan)
Tomoyuki Urabe , Tokyo Institute of Technology (Japan)
M. Kashiwa, Tokyo Institute of Technology (Japan)
T. Tachikawa, Tokyo Institute of Technology (Japan)
N. Yamaguchi, Tokyo Institute of Technology (Japan)
Kuniyuki Omagari, Tokyo Institute of Technology (Japan)
I. Morita, Tokyo Institute of Technology (Japan)
Yoshihisa Yamamoto, Tokyo Institute of Technology (Japan)
Yoichi Yatsu, Tokyo Institute of Technology (Japan)
Tomoko Ikagawa, Tokyo Institute of Technology (Japan)
Jun Kataoka, Tokyo Institute of Technology (Japan)
Saburo Matunaga, Tokyo Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 5488:
UV and Gamma-Ray Space Telescope Systems
Guenther Hasinger; Martin J. L. Turner, Editor(s)

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