OSIRIS SNR Calculator


Actual OSIRIS SNR Calculator is 2.0. New in this version:

  • Latest tunning calibration implemented (red TF).
  • In spectroscopic mode an option to plot counts/pixel has been added.
  • In spectroscopic mode a saturation warning message is shown in the output panel.
  • Some bugs fixed.

Not all the filters listed in this application are available. Visit the GTC / OSIRIS Web pages for more information. For example, Blue Tunable Filter (BTF) calculations are not included in the ETC, please contact with astro-helpdesk@gtc.iac.es for estimates for the BTF.

Some important remarks when using OSIRIS ETC:

  • Before using OSIRIS SNR Calculator for Tunable Filter Imaging mode,please use first the TF Setup tool.
  • Since March 2022, when the instrument migration was completed, remember to select Cassegrain focal station in the ETC.


  • Java JRE 1.6 or later should be installed on your machine.
  • You should set the JNLP MIME type on your browser: application/x-java-jnlp-file to be opened either with the default application or with javaws.

Example: commandline> javaws OSIRISETC.jnlp

Help page

Launch OSIRIS SNR calculator

(if you find problems, click here to see how to enable local security options to run Java)

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Last modified: 16 February 2022

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