GRA4MAT is a special mode of MATISSE where GRAVITY is used as an external fringe tracker. GRA4MAT enables longer exposures in MATISSE, and improves this instrument in two ways: a much wider spectral range can be observed at once in the highest spectral resolution modes and improved sensitivity by about 2 magnitudes compared to the current offering, under certain conditions. This mode will be offered for Science Verification in April 2020, with a Call for Proposals published in January 2020, pending final commissioning and estimation of the performance gains.
Pre-announcement of Call for GRA4MAT Science Verification Proposals
Published: 23 Nov 2019
Currently offered MATISSE performances (without fringe tracking) can be found here:
http://www.eso.org/sci/facilities/paranal/instruments/matisse/inst.html