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We report early follow-up observations of the error box of the short burst050813 using the telescopes at Calar Alto and at Observatorio Sierra Nevada(OSN), followed by deep VLT/FORS2 I-band observations obtained under very goodseeing conditions 5.7 and 11.7 days after the event. Neither a fadingafterglow, nor a rising SN component was found, so the potential GRB hostgalaxy has not been identified based on a comparison of the two VLT imagestaken at different epoches. We discuss if any of the galaxies present in theoriginal 10 arcsec XRT error circle could be the host. In any case, the opticalafterglow of GRB 050813 was of very low luminosity. We conclude that all theseproperties are consistent with the binary compact merger hypothesis for theprogenitor of GRB 050813.Comment: Accepted for publication in AJ. Major revisions have been carried out  and a figure has been adde

Constraints on an Optical Afterglow and on Supernova Light Following the Short Burst GRB 050813