TITLE: GCN CIRCULAR NUMBER: 16856 SUBJECT: GRB140928A: Gemini-South observation DATE: 14/09/30 17:27:54 GMT FROM: Antonino Cucchiara at NASA/GSFC A. Cucchiara, S. B. Cenko (NASA-GSFC), D.A.Perley (Caltech), report on behalf of a larger collaboration: "On September 30.18 UT (1.75 days after the burst) we observed the field of the Fermi/LAT GRB 140928A (Desiante et al. GCN 16847, Varela et al. GCN 16849) with the Gemini-South telescope equipped with the GMOS spectrograph. We obtain 2x1200s exposure under non optimal conditions (1.5-2 arcseconds seeing) with the R400 grating, covering the 6000-10000 Angstrom wavelength range. We detect a featureless continuum down to 6000A, no features are detected neither in emission nor in absorption. We thank Cristiano Guidorzi for providing a finding chart and the Gemini staff for carry out this observations."