of tens of seconds with about a half of them emitted during the first one or two seconds. The Super-K will search for event clusters in specified time windows of 0.5, 2 and 10 s. Data are transmitted to realtime SN-watch analysis process every 2 min and analysis is completed typically in 1 min. When supernova (SN) event candidates are found, is calculated if the event multiplicity is larger than 16, where is defined as the average spatial distance between events, i.e. Neutrinos from supernovae interact with free protons, producing positrons which are distributed so uniformly in the detector that for SN events should be significantly larger than for ordinary spatial clusters of events. In the Super-Kamiokande detector, Rmean for uniformly distributed Monte Carlo events shows that no tail exists below ⩽1000 cm. For the "alarm" class of burst, the events are required to have ⩾900 cm for 25⩽⩽40 or ⩾750 cm for >40. These thresholds were determined by extrapolation from SN1987A data. The system will run special processes to check for spallation muons when burst candidates meeting "alarm" criteria and make a primarily decision for further process. If the burst candidate passes these checks, the data will be reanalyzed using an offline process and a final decision will be made within a few hours. During the Super-Kamiokande I running, this never occurred. One of the important capabilities for [Super-Kamiokande] is to reconstruct the direction to supernova. By neutrino–electron scattering, , a total of 100–150 events are expected in case of a supernova at the center of the Milky Way Galaxy. The direction to supernova can be measured with angular resolution where N is the number of events produced by the ν–e scattering. The angular resolution, therefore, can be as good as δθ∼3° for a supernova at the center of the Milky Way Galaxy. In this case, not only time profile and the energy spectrum of a neutrino burst, but also the information on direction of supernova can be provided. Slow control monitor and offline process monitor There is a process called the "slow control" monitor, as part of the online monitoring system, watches the status of the HV systems, the temperatures of electronics crates and the status of the compensating coils used to cancel the geomagnetic field. When any deviation from norms is detected, it will alert physicists to prompt to investigate, take appropriate action, or notify experts. To