Priorities for Visitor, Service,
Technical, Reserved and Idle nights
2002-12-20, v1.0, ohainaut
SciOp: La Silla Science Operation Department
ToO: Target of Opportunity observations.
DDT: Director Discretionary Time
DDTC: Director Discretionary Time Committee
OPC: Observing Program Committee
Visitor time: a Visiting Astronomer is present at La Silla
to perform his observing program. Overrides to this program are ruled
by the Policy for
Service Time: nights scheduled for Service Mode
Delegated Service Mode: the night is allocated to one
specific program, and the observations are performed by SciOp staff.
The priorities for such night are as for Visitor Time, i.e. set by the
Flexible Scheduling: SciOp staff will perform observations
from a pre-defined pool (the "OB repository"). The priorities for
these nights are as follow:
ToOs (both DDTC- and OPC-allocated).
DDT, ToO compensation, pre-imaging.
Technical Time: nights scheduled for maintenance and
tests. Availability of the telescope or instrument is not guaranteed.
Priorities for these nights are the following:
Urgent technical work,
ToO (both OPC and DDTC) - if technically feasible
Non-urgent technical work,
DDT (not time critical), ToO compensation, pre-imaging.
Reserved Time: nights scheduled for scientific
observations, but reserved for DDT. Time must be requested following
the DDT Policy, at least
one month in advance for "non time-critical" observations.
Once allocated, these nights become either "Visitor Time" or
"Delegated Service Time".
If the time is not assigned by the DDT Committee, these nights are
automatically converted into Technical Time.
Idle time: the telescope is not operated. Urgent technical
work can be scheduled during these nights, but no observations, as
there is typically no staff to operate the telescope on these nights.
Exceptions and override must be channeled to the Director General via