EUROPEAN SOUTHERN OBSERVATORY
La Silla Observatory - Science Operation Department
Delegated Service Observations during a Visitor Mode Run
|Prepared:||Gaspare Lo Curto|
||Olivier Hainaut, HoSciOps
This policy clarifies the modality of Delegated Service Mode observations scheduled during a Visitor Mode program.
Due to the special nature of HARPS observations (often devoted to monitoring), it is frequent to have such a short DSM run (of a few hours) hosted during a long visitor run. This policy is of direct application to such cases.
It should be noted that a different policy  considers the Target of Opportunity observations over-riding a visitor mode program.
The PI of the DSM run will submit a detailed Phase II preparation
package, including OBs and README file, according to the Phase II
instructions valid for the considered period .
The PI of a VM run affected by a DSM program will have to be notified in advance (before the arrival of the observer at La Silla) of the duration of that DSM program, and of its approximative splitting (e.g. 30min per night, 3x 1h, etc..).
Before the beginning of the run, the VM run observer and his support
astronomer will decide together of the scheduling of the DSM
observations. This has to be done taking into account the scheduling
requirements of the DSM program described in the Phase II, and
minimizing the impact on the VM run. This schedule should be fairly
detailed, defining a window of about 1/2h for the beginning each DSM OB.
The idea is to lock the schedule in advance so that weather losses can be allocated to one program or the other without discussion on which loses the time. The fairness of the system relies on the random aspect of the weather and technical losses.
The VM Observer commits to comply to the agreed upon schedule, no
matter what the actual weather conditions turn out to be. Similarly,
technical time losses will not affect that schedule.
For instance, if the conditions are too bad for the VM program to be executed, and suddenly improve at the beginning of a DSM time slot, the DSM program will be executed. Alternatively, if the weather is bad during a DSM time slot, that slot is lost to the DSM program.
A possible exception to this rule is the case of wind pointing limit. If the DSM program cannot be executed during one of the time slot because of wind pointing restrictions, the VM program can proceed (and the DSM loses the time). Alternatively, if the VM program cannot be performed due to wind pointing restrictions, the DSM could be executed.