VizieR Online Data Catalog GRB 140506A spectra (Fynbo+, 2014)

On 2014 May 7, with a mid exposure time of 8.8h post burst, we acquired a medium-resolution spectrum with the X-shooter spectrograph mounted at the ESO/VLT, covering a range of 300-2300nm (Fynbo et al., 2014, GRB, 16217, 1). The spectrum was taken under excellent conditions with a photometric sky and a very good seeing of 0.54" in the R band. The observation was carried out in two executions of a 4x600s observing block following an ABBA nodding pattern. The slit was re-aligned with the parallactic angle between the two executions of the observing block. The slit widths were 1.0", 0.9", and 0.9" in the UVB, VIS, and NIR arms, respectively. The airmasses at the start and end of the spectroscopic observation were 1.43 and 1.22. For the given instrument setup, the nominal resolution is 5500, 8800, and 5100 in the UVB, VIS, and NIR. As the seeing was smaller than the slit width, the actual resolution is higher than this. For the VIS, we measure the resolution from the width of telluric absorption lines and find it to be 24km/s (FWHM). For the UVB and NIR arms we find ~40 and 42km/s. All wavelengths are in vacuum and are corrected for the heliocentric velocity of 18.9km/s. (6 data files).