Fermi Gamma-ray Space Telescope

Kanazawa-SAT^{3}: Microsatellite-borne X-ray Transient Localization Experiment Searching for Electromagnetic Counterparts of Gravitational-wave Sources

Tatsuya Sawano
(Tatsuya Sawano, Daisuke Yonetoku, Tatehiro Mihara, Makoto Arimoto, Kazuki Yoshida, Yasuaki Kagawa, Kaichi Ota, Yusuke Takao, Daichi Suzuki, Koga Miyao, Shota Watanabe, Hirokazu Ikeda)


Coalescences of binary neutron stars are thought to promising candidates of progenitors of short duration gamma-ray bursts, like GW 170817/GRB 170817A. In such a context, they emit not only a gravitational wave and a prompt gamma-ray emission with an energy of ~ MeV, but also possibly X-ray extended emission, optical/NIR macronovae, and even GeV gamma-rays. To discuss the whole picture of those events, localization information in early phase is essential to follow-up observations for narrow filed telescopes. Therefore, we have been developing a 50-kg-class microsatellite, named Kanzawa-SAT^{3}, and its objective is to detect X-ray transients and alert the trigger time and coordinates of those transients to promote follow-up observation of gravitational-wave sources. We plan to launch it in about 2020. There are two mission instruments aboard the satellite. The one is a wide field X-ray imaging detector, named T-LEX, based on a coded aperture system with a FoV of 1 sr, a localization accuracy of 15 arcmin, and an energy range in 2 - 20 keV. The other is a small gamma-ray detector, named KGD, with a scintillator and SiPMs. So far, we have developed a thermal structure model of the bus system and a flight model of T-LEX. In this talk, we introduce the mission concept and report the current status of the development.