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The setup and first results from commissioning of a fast online photon energy spectrometer for the vacuum ultraviolet free electron laser at Hamburg (FLASH) at DESY are presented. With the use of the latest advances in detector development, the presented spectrometer reaches readout frequencies up  to  1  MHz.  In  this  paper,  we  demonstrate  the  ability  to  record  online  photon  energy  spectra on  a  shot-to-shot  base  in  the  multi-bunch  mode  of  FLASH.  Clearly  resolved  shifts  in  the  mean wavelength  over  the  pulse  train  as  well  as  shot-to-shot  wavelength  fluctuations  arising  from  the statistical nature of the photon generating self-amplified spontaneous emission process have been observed. In addition to an online tool for beam calibration and photon diagnostics, the spectrometer enables the determination and selection of spectral data taken with a transparent experiment up front over the photon energy of every shot. This leads to higher spectral resolutions without the loss of efficiency or photon flux by using single-bunch mode or monochromators

Spectrometer for shot-to-shot photon energy characterization in the multi-bunch mode of the free electron laser at Hamburg