The EMIR Exposure Time Calculator (ETC) allows users to predict the signal-to-noise ratio for all EMIR/GTC observing modes (spectroscopic and photometric). The EMIR ETC is written in XML/python and allows the user to define their observations, including target information, target spectral energy distribution, instrument setup, atmospheric conditions and observing parameters.

Please note, the EMIR ETC does not take into account instrument and telescope overheads. Estimated exposure times could be strongly affected by variations in atmospheric conditions.

If you experience any problems with the EMIR ETC or would like to suggest improvements, please contact lpatrick (at) iac (dot) es and provide as much information as possible.

The EMIR ETC outputs a series of figures and information by default.