Requesting Lost and TBS Time on ARO Telescopes

Requesting Lost Time on ARO Telescopes:

If time has been lost due to weather or technical issues during regularly scheduled observations on the UArizona ARO 12-meter Telescope or the UArizona ARO Submillimeter Telescope, observers can request that this time be rescheduled by sending a request to ARO Helpdesk. Observers should indicate their project code, the telescope, amount of time lost, why the original observations could not be completed, as well as the distribution of LST blocks lost. To enable efficient rescheduling, requests should be made as soon as possible after the lost time has occurred. 

An example request is shown at the bottom of this page.

Requesting TBS Time on ARO Telescopes:

LST blocks labelled "TBS" in telescope schedules are "to be scheduled" and are available to observers via a formal request. The Time Allocation Committee may also recommend observers whose original proposals could not be fully accommodated. Requests must be received 7 days in advance. If no requests are received by the scheduling deadline, observers may still request time up to the first block of TBS. However, it may be difficult for ARO staff to support the required instrument/telescope configuration on short notice. 

To apply for TBS time on the UArizona ARO 12-meter Telescope or the UArizona ARO Submillimeter Telescope, please submit a written request including a brief(!) scientific justification and cover sheet (  as a single pdf file to

The allocation of TBS time will be arbitrated by the Director as needed. Revised schedules will be announced by ARO Operations Manager, Remo Tilanus.


Example Lost time request:

Project: Shirley_17A_01
Telescope: 12m
Time Lost (list the start date, LST range of time lost, and reason lost)

1. Feb 17 2017, 4-10h LST, Closed -- High winds
2. Feb 18, 2017, 23-10h LST, Closed -- Rain
3. Feb 19, 2017, 8-10h LST, Technical problem