On June 25th 2017, the new intermediate-resolution optical IFU and MOS of the 10.4-m GTC had its first light. As part of the tests carried out to verify the...
We present the first science results from the High Optical Resolution Spectrograph (HORuS), a cross-dispersed echelle spectrograph now in operation on the 10.4...
First Scientific Results of the Near Infrared Spectrograph LIRIS
LIRIS is a near-infrared (1-2.5 microns) intermediate resolution spectrograph (R=1000-3000) with added capabilities for multi-slit, imaging, coronography, and...
First steps of the GTC photometric calibration plan
Large telescopes require a very precise calibration in order to maximize its scientific output. Current catalogues of standard stars are generally too bright...
First Steps toward Seismic Holography of the Tachocline
The solar dynamo is thought to be generated at the tachocline and the deepest layers of the convection zone. Yet much about these layers or how this mechanism...
First Steps Towards the Electronic Inversion of the Radiative Transfer Equation
The radiative transfer equation (RTE) gives us information about how the light streams through the medium. It must be inverted in order to obtain the properties...
First tests on the Integral Field Unit for GRIS at GREGOR
The observation of the highly dynamic events in the chromosphere with current slit or filter spectropolarimeters is not adequate. With the sake of incresing the...
First Working Group Meeting on Radioastronomical Databases
The aims, achievements and plans of the Working Group on `Radioastronomical Databases' of IAU Commission 40 are outlined. Special recommendations emerged from...