GHOST is currently unavailable due to the replacement of the ThAr arc lamp. Troubleshooting began on Tuesday, Mar 25, and is still ongoing. 

A sudden drop in arc lamp intensity was identified starting on Feb 13, which has continued to decline over time. This degradation has affected the wavelength calibration, introducing uncertainties in the data. 

PIs of GHOST programs taken between Feb 13 and now are advised to use arc images acquired before Feb 13 for wavelength calibration. 

We will provide futher updates as soon as the instrument becomes available again.