Abstract
Gamma-ray bursts (GRBs) are the most luminous transient events with short intense flashes thath have been detected in random directions in the sky once or twice per day. Their durations have been measured in seconds, especially short GRBs with duration of <2 s. Recently, GRB080319B, measured as the brightest optical burst with 5.3 mag, leads the prompt optical emission mechanism, and GRB090423 measured at z = 8.2 is the most distant object, becoming an attractive probe of the early universe. The next-generation GRB space mission requires a fast telescope with a fine time resolution for understanding the temporal behavior of the GRB afterglow and with a high photon sensitivity for detecting the photons of highredshift GRBs. We give an overview of the instrument and describe the proposed fast readout system in the following sections.
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