News

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VISIR News

  • August 26, 2015: Operations with VISIR have been resumed after it has been verfied that the conversion factors are stable in an acceptable way (< 10% variation for the imager, < 18% for the spectrometer). An inspection of the instrument adressing the temperature instabilities is foreseen for mid-September.
  • August 14, 2015: Operations with VISIR have been suspended because the temperatures of the two detectors are unstable and this has an effect on the sensitivities and conversion factors. The problem is currently under investigation.
  • July 02, 2015: VISIR is back on the telescope after a successful intervention: on sky tests have shown the flexure problem has been solved. The spectrograph focussing mechanism is also working again. Further (re-)commissioning activities are planned for the next days.
  • May 23, 2015: VISIR has been taken off the telescope in order to correct an internal flexure of the instrument which prevented longer inegrations. The intervention will be carried out in June and allow for other minor improvements. The instrument is anticipated to be back on sky in early July and no significant impact on P95 science is expected.
  • March, 2015: Tests with the coronograph AGPM were carried out successfully, so that this observing mode can be offered for P96. The following rejection rates can be guaranteed, provided seeing conditions better than 0.9 arcsec: 3 in the 11_3_4QP, 4 in the 12_4_AGP and 3 in the NeII filters.
  • February 28, 2015: Start of phase 1 for P96 (Sep 2015 - Mar 2016) with dealine on March 26th, 2015; User Manual updated for P96 phase 1. NOTE: Additional information concerning the available instrument modes and sensitivities will be provided after March 15th when the ongoing commissioning run has been completed.
  • February 3, 2015: Start of Phase 2 proposal preparation for P95 (deadline: March 2nd, 2015).
  • February 2, 2015: User Manual updated for P95 phase 2.
  • January 13, 2015: Second VISIR re-commissioning run completed successfully.
  • August 26, 2014: VISIR is offered again in Period 95, pending successful recommissioning during Period 94. Only service mode is available, and a limited number of instrument modes: small-scale imaging (0.045 arcsec/px), long-slit low-res spectroscopy, and long-slit and cross-dispersion high-res spectroscopy (pixel scale for spectroscopy 0.076 arcsec/px). Burst mode, Sparse Aperture Masking, and medium-res spectroscopy are not available. The maximum chop throw is 10 arcsec. The instrument overheads remain the same. At this time the post-upgrade capabilities are not yet fully characterized, and the users should assume the same sensitivity as for the pre-upgrade VISIR. For details see the new Period 95 user manual. The astronomical community is encouraged to monitor the latest VISIR news on this page.
  • September 10, 2013: VISIR detectors are still out of specifications, as a consequence, VISIR is not offered during P93.
  • February 20, 2013: Due to problems with the new Raytheon detectors, VISIR will not be available for regular observations during P91 & P92.
  • October 25, 2012: Due to out-of-specifications properties of the new detectors, VISIR is not available for regular observations during P90. Most likely this will be the case for the entire period.
  • September 4, 2012: The P90 User manual applies also for P91 phase-I preparation.
  • August 17, 2012: An updated version of the P90 User Manual is available.
  • August 17, 2012: Problems during the first re-commissioning run did not allow to meet the sensitivity expectations. A second re-commissioning is planned for the end of October 2012. Regular science operations with VISIR are expected to resume at the begining of November 2012.
  • December 8, 2011: The VISIR upgrade is scheduled between May-September 2012. Thus, approved P89 programs will cluster either in the month of April or in the last 2 weeks of September 2012.
  • September 1, 2011: Release of P89 User Manual with first information on the new AQUARIUS detector.
  • September 1, 2011: VISIR upgrade is planned between January-March 2012.
  • June 23, 2011: Relative transmission curves for B and J filters made available.
  • March 28, 2011: Link to the forthcoming VISIR upgrade project
  • February 22, 2011: IMPORTANT: Given the forthcoming VISIRdetector upgrade, please note that VISIR P88 availability will be limited to the first part of the period. Further details will beprovided as soon as possible.
  • February 22, 2011: The J8.9 filter is confirmed to have a ghost, please avoid its use.
  • November 24, 2010: release of VISIR operating manual.
  • September 27, 2010: Emphasis (in the user manual) on the non availability of K-band science IMAGING.
  • June 28, 2010: Table.7 in the user manual is updated (i.e. the first line refering to HR-mode).
  • April 20, 2009: VISIR has been re-installed at the Cassegrain focus of UT3. Image quality was verified and the instrument is fully operational
  • January 31, 2006: first public release of the data reduction pipeline
  • December 20, 2005: user manual updated for P77 phase 2
  • December 20, 2005: guidecam tool a tool to select guide stars, adapted for VISIR
  • December 20, 2005: Cohen 81 a list of 81 standard stars, selected from Cohen et al. (see user manual )
  • December 20, 2005: Cohen 12 a list of 12 standard stars, selected from Cohen et al. (see user manual )
  • September 4, 2005: user manual updated for Call for Proposals P77
    • New low resolution, medium resolution and high-resolution, cross-dispersed modes released
    • Acquisition for spectroscopy can be done with the imager detector
    • Acquisition for imaging and spectroscopy can be done with a K-band filter