Sukima (dead time)

The “dead time”, or sukima, is a time during classical mode observations when no target is available (due to weather, visibility, etc.). For HSC classical observations, queue programs may be executed in such cases, and will be given higher priority than classical backup targets. All GRADEs (ABC) are accepted for sukima, and the OBs will be prioritized in the same way as during nights assigned to the QM.