Kiso observations of 20 GRBs in the HETE-2 era

We established a GRB follow-up observation system at the Kiso observatory (Japan) in 2001. Since prior to this the east Asian area had been a blank for in GRB follow-up observational network, this observational system is very important for studying the temporal and spectral evolution of early afterglows. We have thus been able to make quick observations of early phase optical afterglows based on HETE-2 and INTEGRAL alerts. Thanks to this quick follow-up observational system, we have so far been able to use the Kiso observatory to monitor 20 events, and conduct follow-up observations in the optical and near-infrared wavelengths.