The goal of this blog is to become a dynamical way of providing fast and updated useful information, to the user of the instrument OSIRIS at GTC, complementing the information provided by GRANTECAN S.A.
It contains information about the manuals, instrument calibration, pipelines for download, tutorials, contributions, announcements, etc. Also, some historical information about the integration, and commissioning of the different observing modes is provided as well.
This Blog is maintained by the OSIRIS Scientific Team.

Tuesday, November 27, 2012


The TF wavelength calibrations provided in Méndez-Abreu et al. (2010), and Mayya et al. (2012) are wrong. Not only they are based on completely erroneous optical concepts, such as arbitrarily assuming changes of the focal distances of the OSIRIS camera or that of the GTC (!), but the numeric results from their formulae depart from the full correct calibration. This can lead to significant errors, even in the central part of the FOV. PLEASE NOTE that the only correct wavelength calibration is that provided in this blog and the last version of the OSIRIS TF User's manual, that can be downloaded from here

To sort out this problem, the next version of the OSIRIS pipeline will include the TF wavelength calibration across the FOV.

Tuesday, October 16, 2012

The OSIRIS Offline Pipeline Software: OOPS

Downloads, user support and survey

The OSIRIS Pipeline Software (OOPS) v1.4.5 can be downloaded here

The manual of the current version of OOPS can be downloaded here

For troubleshooting and queries, please contact here, we will contact you as soon as possible.

Finally, please fill this survey after using OOPS. The answers will be used by the GTC Users' Committee and the OSIRIS Instrument Team, for the future upgrade of the OSIRIS Pipeline yielding to its final version (v1.4.6). For that purpose, please take into account the scope of the final version v1.4.6 as summarized in the table below. The survey will close December 31st 2012.

v1.4.5 v1.4.6
 release date15Oct 201215 April 2013
broad band imagingmaster bias preparation YESYES
master dark preparation YES YES
master flat (sky) preparation YESYES
overscan subtraction YESYES
bias subtraction WARNINGYES
flat removal YESYES
application of the WCS YESYES
 flux calibration     NO YES
tunable filter imagingmaster bias preparation YESYES
 master flat (sky) preparation YESYES
 overscan subtraction YESYES
 bias subtraction WARNINGYES
 flat removal YESYES
sky ring subtraction  YESYES
fringing removal NO YES
 application of the WCS YESYES
  flux calibration     NO  YES
long slit spectroscopymaster bias preparation YES YES
master dark preparation  YES YES
master flat (dome) preparation YES YES
making new wavelength solution  YES YES
using internal wavelength solution NO  YES
using previous wavelength solution NO  YES
overscan subtraction  YES YES
bias subtraction  WARNING YES
flat removal  YES YES
wavelength calibration  YES YES
spectrum extraction  NO YES
flux calibration  NO YES
multi object spectroscopymaster bias preparationYES YES
 master dark preparation YES YES
identify slitletsYES YES
master flat (dome) preparationYES YES
making new wavelength solution YES YES
using internal wavelength solution NO  YES
using previous wavelength solution NO  YES
computing central wavelength change across the FoV  NO  YES
overscan subtraction YES YES
bias subtraction WARNING YES
flat removal YES YES
wavelength calibration YES YES
spectrum extraction NO  YES
flux calibration  NO  YES

Wednesday, March 14, 2012

New RTF calibration

RTF wavelength variation across the FOV

As in any filter in a non-telecentric beam, the central wavelength of the narrow band filter provided by the TF varies wrt the distance to the optical centre. The new instrument calibration provides a calibration for this effect with an accuracy of the order of the TF tuning accuracy (1A).
More details can be found here, and in the TF Manual.