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\section{Data}  \subsection{New Observations}  The observations of our star, USNO-A0600-15865535, were taken with VLT/FLAMES obtained at the European Southern Observatory (ESO)  on the nights of May 6th and May 7th, 2016. The star was observed as a part of the program 097.A-0552(A) "Mapping the Cool Circumgalactic Medium with Calcium II" on VLT UT1 the Verly Large Telescope (VLT)  using the fiber FLAMES/GIRAFFE spectrograph, a fiber-fed  multiobject spectrograph FLAMES. mounted on the Nasmyth focus of UT2 \cite{2002Msngr.110....1P}.  USNO-A0600-15865535 is a bright ($g= 14.2$) very blue ($g-r = -0.21$) source, unresolved in Pan-STARRS imaging. Through a combination of overoptimism and clerical errors, it was targeted as a quasar candidate behind the circumgalactic medium of M83. Unfortunately, %Unfortunately,  a combination of poor weather and failures of the FLAMES instrument limited our observing time to 4.5 hours of clear weather data. Here's The GIRAFFE High Resolution mode was used in the H395.8 setup (HR02), which gives access to the 385.4 to 404.9nm range in the near UV at  a list spectral resolving power $\lambda / \delta \lamdat$ of 22,700. A total of 4.5 h of integration were obtained, split in 3 exposures of 90 min. Given that most of the program targets were faint, the non-standard 50 khz,1×1, high gain readout mode was used \cite{2008Msngr.133...17M}. Corresponding bias, dark, flats and arc calibration frames were obtained within 24h  of the science  observations. The raw scientific  data were reduced using Hugues's magic, bias- and dark-subtracted, flat-fielded  and wavelength  calibrated using the instrument's Common Pipeline Library v12.14.2 under the esorex environment. The source spectra were extracted  in thus-and-such a way. the SUM mode. Finally the individually exposure were summed up to improve the signal-to-noise ratio of the extracted data.  %While we observed many targets with FLAMES, this work will focus on a single target, USNO-A0600-15865535, for which we acheived a signal to noise of X.