Helium, the cryogen of XRS, was totally lost away and XRS is not
operational any more. It happened in the morning of August 8 (11:25
JST). XRS team found the He tank temperature was about 6-8 K, which
should be 1.3 K. It means the tank is empty and warmed up to this
temperature. There are many other data to suggest this incidence. The
situation and reasons of this incidence is being investigated.
XRS detector system has been working properly at least first 19 days
with energy resolution of 7 eV at the temperature of 60 mK. Therefore
its technology is almost proven, but we can not get astrophysical data
any more with XRS.
Though one of the main instruments is lost, we still have X-ray CCD
camera (XIS) and hard X-ray detector system (HXD). We will continue
initialization process of XIS and HXD and try to get best science with