IGRINS

IGRINS (Immersion GRating INfrared Spectrograph) is a visiting instrument at Gemini South, sponsored by KASI and UT Austin since 2018A. It is a high-resolution (R=45,000) near-IR (H and K bands) spectrograph covering the entire wavelength range between 1.45 and 2.45μm. IGRINS is supported by UT Austin and more extensive documentation can be found on their overview page.

Below are a few data reduction notes. More details and procudures can be found here.

1) For the data we were sent from Gemini were reduced with the automatic pipeline.   The telluric reference star was the closest star observed in time to the target star.   We discovered looking at the logs that more suitable telluric reference stars existed.

2) Our experience has been that while the individual orders are of high quality joining the orders can involve considerable effort.   It is possible that this is a Gemini feature resulting from the pupil illumination in Gemini flats.  Dick Joyce and Joe Llama (Lowell) have been investigating this problem.

Last updated or reviewed September 24, 2020.