A planned IT Maintenance and Release Window is scheduled between
Saturday, 19 July 2025 at 08:00 CEST/02:00 CLT and Sunday, 20 July 2025 at 24:00 CEST/18:00 CLT.
From 08:00 CEST/02:00 CLT on Saturday, all ESO IT services including ERP, Email, Database Management Systems,
the Scientific Archive, the User Portal, and internet connectivity on all ESO sites, may experience intermittent outages.
Full services cannot be guaranteed before Monday, 21 July 2025. We apologize for any inconvenience this may cause.
OB run-time failure policy
Although ESO carefully reviews Service Mode Observation Blocks (OBs) before they are scheduled at the telescope, it is impossible to detect every OB problem until it is actually executed.
If an OB fails to execute due to an error introduced by the user (as for example if the user entered wrong target coordinates), ESO reserves the right to charge the respective observing programme for the time lost during night operations. Time charged will include any telescope time used to investigate why OB execution failed.
For Service Mode observations time lost due to failures caused by ESO (e.g. instrument malfunction) will not be charged to the user. Whenever possible, these OBs will be re-executed as time, conditions, and overall priority permit.