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It is sometimes the case that the parameters entered by the PI into the Phase-1 SGs need to be updated before the approved observations are executed. A common example is an updated position that has been derived via observations taken since the submission of the original proposal. The OT will allow a PI to make small changes to the positions and spectral window centre frequencies in the Phase-2 SGs, all comparisons being made to the uneditable Phase-1 SGs. The criteria for these so-called ``minor changes'' are the following:
- Pointing-position shifts must be less than half of the antenna beamsize (primary beam). The shift can result from a combination of changing the source coordinate and the pointing position offsets.
- Spectral window frequency shifts must be less than 20 per cent of the spw bandwidth. These can result from a change in the source velocity and/or a direct change in the spw centre frequency.
Larger changes, or edits to other SG parameters, must be done by observatory staff and requested via the Helpdesk.
Next: Submit the Phase-2 SGs
Up: PI Steps for Approved
Previous: Phase-2 Science Goals
Contents
The ALMA OT Team, 2018 Sep 25