The proposal process for the Supplemental Call is very similar to that for the pre-launch Call and, in summary, is as follows. Proposers send so-called ``Phase 1'' proposals to the SOC at ESTEC by the given deadline. These proposals contain the scientific justification and planned observations, including details such as instrument and mode, filter or wavelength, and total required time. Version 1.3 of the ISO Remote Proposal Submission System (IRPSS) is to be used for preparation of Phase 1 proposals. The Observing Time Allocation Committee reviews these proposals and recommends priorities and times. The Principal Investigators of proposals, which receive a priority above a certain cut-off, are then invited to travel at their own expense to the ESA Proposal Data Centre at ESTEC (US proposers to IPAC) to enter full details of their observations (the so-called ``Phase 2'' proposals) into a SOC data base. Remote login facilities will also be available.
To expand the above into somewhat more detail, you have to complete the following tasks for Phase 1:
On receipt of the proposals, the SOC will forward them to OTAC for scientific review, while making, in parallel, some technical assessments and preparing overall statistics on the response. The OTAC will assign priorities to each proposal (and, as needed, grade individual observations within a proposal). OTAC will provide for the necessary oversubscription (see section 6.2.2) in observations by recommending that the required number of proposals be entered into the Phase 2 data base.
``Successful'' Phase 1 proposers have to complete the following tasks in Phase 2:
The feasibility of observations will be checked in greater detail during the Phase 2 process and the results of this checking may result in OTAC adjusting the priorities they awarded during Phase 1.
One of the parameters, used by the scientific scheduling software to plan which observations will be carried out during a particular orbit, is the priority of the observations as allocated by OTAC. The higher the priority an observation or proposal receives, the greater the probability that it will be carried out (see entry on priority in the glossary). However, for operational reasons, no guarantees can be given that any particular observation will, in fact, be executed, regardless of its grade.