MEGARA @ GTC: performance review and commissioning results

MEGARA, the optical multi-object spectrograph (MOS) for the GTC 10m telescope, has been developed by a Consortium whose partners are UCM, INAOE, IAA-CSIC and UPM. MEGARA has 2 observing modes on sky: (a) a central IFU 12.5” x 11.3” of 567 fibers, complemented with 8 x 7-fiber bundles for sky subtraction, and (b) a MOS mode with 92 robotic positioners, covering a total FoV of 3.5' x 3.5'. MEGARA provides intermediate-to-high spectral resolution (R~6000, 12000 and 18700) with 6LR, 12MR, and 18HR VPHs, being 11 of them simultaneously mounted. MEGARA is a highly user-oriented instrument, which has a complete set of software tools for both, preparing the observations, and reducing and visualizing the data. MEGARA arrived at the GTC on March 28th 2017, and after the integration and commissioning phases, it has been offered to the community in the recent Call for proposals for semester 2018B. This talk summarizes MEGARA capabilities and gives an overview of the on-sky performance and the first scientific results with the commissioning observations.