GNIRS

Gemini NorthNear-IR

Last Modified:

Friday, May 17, 2024 - 17:46

GNIRS is a multi-function spectrograph, covering a spectral range of 0.8−5.4 μm and providing a variety of low, medium, and high resolution modes sampled by four different camera options. It can be used with the ALTAIR AO system. GNIRS has some limited imaging capabilities.

Available For Proposals at Gemini North
For more details, see the schedules and the CfPs.

All slit spectral and LR-IFU modes along with imaging are available. The commissioning of the High Resolution IFU has been completed and is now offered for the 2024B semester. The short red camera is currently not available for observations.

Capability Summary

Spectroscopy

Resolutions
- 1200−18000 for a 2-pixel slit (depending on the camera and grating combination)
Modes
- Single Longslit (1.0−5.4 µm, read more)
  - Slit lengths of 99" (short camera) or 49" (long camera)
  - Simultaneous coverage = 40−1000 nm
- Cross-dispersed (0.8−2.5 µm, read more)
  - Slit lengths of 7" (short camera) or 5" (long camera)
  - Simultaneous coverage = 1650 nm

Integral Field Spectroscopy

Modes
- Low-Resolution IFU (1.0−2.5 µm with the short blue camera, read more)
  - Spectral resolution 1700−7200 (with the short blue camera, depending on grating)
  - Field of View 3.15" x 4.80"
  - Spatial Sampling 0.15" x 0.15"
  - Simultaneous coverage = 100−660 nm
- High-Resolution IFU (1.0−5.4 µm with the long cameras, read more)
  - Spectral resolution 1200−19000 (depending on camera and grating)
  - Field of View 1.25" x 1.80"
  - Spatial Sampling 0.05" x 0.05"
  - Simultaneous coverage = 30−1000 nm

Imaging (Read more)

~0.1-0.34 arcmin^2 field of view (varies with filters/camera)
0.15"/pixel (short camera) and 0.05"/pixel (long camera) spatial sampling
Order-blocking, broad and narrow band filters

Guiding Options (Read more)

PWFS2
Altair (NGS, LGS, LGS+P1)

Get the sensitivity
Get to the integration time calculator

GNIRS was built by NOAO in Tucson, Arizona and delivered to Cerro Pachón in late October 2003. Commissioning of the majority of the modes took place in stages during 2004. GNIRS was first made available for science use in 2004B. The instrument was damaged in 2007 while at Cerro Pachón and was repaired at Gemini North. Since 2010 it has been available for use on the Gemini North telescope. The commissioning of the LR-IFU optical sub-system provided by the University of Durham (UK) has been completed in 2023. While the commissioning of the HR-IFU optical sub-system, also provided by the University of Durham (UK), has been completed in 2024.