SLIM was indeed powered down at 17:57 UTC (which is when AMSAT-DL reported loss of signal; see post #27). Battery level was 12% at that time, 2.5 hours after touchdown.
Telemetry shows that the solar panels are facing west and there is hope that later in the lunar day, the system may revive. Many of us concluded that from the webcast images.
AkaSci
uastronomer