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Phase I/II Checklist

Probably link to the MIR checklist

OT Library

The Observing Tool libraries contain "pieces" of observations e.g. commonly used configurations, sequences, standard calibrations and ancillary information which may be copy-and-pasted into a new observation. The intent of these libraries is to speed the development of new science programs. As observing procedures and instrumental configurations may change from semester to semester (installation of new GCAL filters, for instance), it is advisable that PIs download the most recent libraries when defining new observations.

OT Details

This page explains how to configure T-ReCS in the Observing Tool:

Observation Preparation

This section contains instructions for configuring T-ReCS at phase II. It is organised as follows:

Sensitivity Tables (AO: NGS and LGS)


  • The sensitivity tables assume photometric conditions (50%-ile cloud cover), grey time (80%-ile sky background) and an airmass of less than 1.2. Note however that the OH sky emission can vary by a factor of ~2 up or down during the night
  • Individual exposure times of 600s were assumed for all cases.
  • Observations are assumed to be at f/32 and dithered (target object in the field at all times); sky subtraction noise is included.

Sensitivity Estimates

The values below are based on measurements at the telescope. These values are similar to what is estimated by the T-ReCS Integration Time Calculator. The overall accuracy of the ITC S/N values is of the order of a factor of 1.2 to 1.4, since conditions at the telescope may vary during an observation, and since for faint targets the assumed square-root of time scaling will not hold exactly. For faint targets we advise people to be conservative in their exposure times to ensure that the desired S/N is obtained. Sensitivity estimates are available for

Observing Overheads

Entrance Window

T-ReCS contains three entrance windows that are interchangeable in real time; the control software selects the window that is best for the specific observation and conditions.

  Initial Setup Observing efficiency
Imaging 6 mins 30%
Spectroscopy (chop-nod mode)