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Description
We present high spatial resolution observations of the close circumstellar environment of the semi-regular S-type star pi^1^ Gruis obtained with the Very Large Telescope Interferometer (VLTI) of ESO's Paranal Observatory and MIDI, the MID-infrared Interferometric recombiner. MIDI combines the light of two telescopes and provides spectrally resolved visibilities in the N band atmospheric window. The observations of pi^1^ Gruis were conducted with the VLT Auxiliary Telescopes (ATs) A0, E0, D0 and G0, providing projected baselines in the range of 15 to 64 meters oriented from PA=41 to 102{deg}. The ATs observations were made during the nights of May 21-23-24-25-27 2006, June 19 2006, and August 08 2006. All the observations were made under good atmospheric conditions (average seeing ~0.94") with the worst seeing (~1.51") during the night of May 27 2006. The files includes all visibility and differential phase data recorded from these observations as well as all the characteristics concerning the observations. The log of the observations is shown in Table 1.
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