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Detector Array

Detector characteristics are given in this section. Note that the GMOS-South detectors have been upgraded in 14B. Note also that the telescope optics are now silver-coated, reducing the system throughput in the blue.

GNIRS Temporarily Unavailable

Due to ongoing problems with its cold heads, GNIRS is about to be removed from the telescope and warmed up for closer inspection. We should know by Friday October 10th whether this intervention has been successful. The instrument will not be available for observations during this period, and NIRI will be installed on the GNIRS telescope port instead (see the 2014B telescope schedule:

GMOS-S Array (EEV)

This information refers to the EEV detectors at GMOS-S. These were removed in May 2014 and are no longer available. The Hamamatsu detectors were installed in June 2014. 


The GMOS South detector array consists of three 2048x4608 EEV chips arranged in a row. The table below gives a summary of the current detector/controller characteristics.

Gemini Instrument Feasibility Studies: FUNDING AVAILABLE

Gemini Observatory is pleased to announce the release of the Gemini Instrument Feasibility Studies Request for Proposals (RfP).

Please visit this page for full details.

Smallest Known Galaxy with a Supermassive Black Hole

Bias Images (N and S)

Example bias images are available for the following instrument/detector combinations:


Gemini Frontier Field: First Data Now Available

GMMPS for Hamamatsu CCDs available

The latest version of the Gemini MOS Mask Preparation Software (GMMPS 0.4.1) is now available. Please see the GMMPS web page for more information and download links.


Calibrations for GNIRS consist of the following measurements.

GMOS-S Gain and Read Noise Values

The table below gives gain/read-noise values for the current GMOS Hamamatsu CCDs measured in September 2015, after the commissionig and characterization of the new video boards (see status and availability page for more details) 

Note: GMOS South data obtained before Aug 31, 2015 should use the previous gain/read-noise values.