[Prex] Shift cancelled for shift leader for Swing and Owl

[Jinlong Zhang]

Concerned by the safety of the Ca48 target, we will not have beam to 
Hall A until tomorrow morning. Shift leader shifts for the rest of the 
SWING and OWL are cancelled. Target operators _*should_*show up and 
monitoring the cryo targets.

Regards,
Jinlong (current RC)
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