5.1. Example 2 - Datasets description

5.1.1. J-band Dithered Point Source Longslit with 111 l/mm grating

In this example, we will reduce the GNIRS J-band longslit observation of a metal-poor M dwarf.

This observation uses the 111 l/mm grating, the short-blue camera, a 0.3 arcsec slit, and is set to a central wavelength of 1.22 ${\mu}$ m. The dither pattern is two consecutive ABBA sequences.

The calibrations we use for this example are:

BPM. The bad pixel masks are now found in the Gemini Science Archive instead of being packaged with the software. They are associated like the other calibrations. (The date in the name is the “valid from” date.)
Flats taken in the same configuration as the science. They were obtained at night right after the science observations.
An arc taken in the same configuration as the science and also obtained at night at the end of the science observation sequences.
A telluric standard observation taken in the same configuration as the science and obtained at night, in this case, just after the science observation sequence, and at a similar airmass.

Warning

The Bad Pixel Masks (BPMs) are now found in the archive rather than packaged with the software. You must get the static BPM from the archive. See Get the BPMs in Tips and Tricks.

Here is the breakdown of the files. All the files are included in the tutorial data package. They can also be downloaded from the Gemini Observatory Archive (GOA).

Science	N20180201S0052-59
Science flats	N20180201S0060-64
Science arcs	N20180201S0065
Telluric	N20180201S0071-74
BPM	bpm_20100716_gnirs_gnirsn_11_full_1amp.fits