TITLE: GCN CIRCULAR NUMBER: 17153 SUBJECT: GRB141202A: Discovery Channel Telescope Optical Observations DATE: 14/12/09 04:09:42 GMT FROM: John Capone at UMD J. Capone (UMD), V. Toy (UMD), A. Cucchiara (NASA-GSFC), S.B. Cenko (NASA-GSFC), E. Troja (NASA-GSFC), A. Kutyrev (NASA-GSFC), and S. Veilleux (UMD) report on behalf of a larger collaboration: We observed the field of the variable source reported by Marshall and Cenko (GCN 17139) with the Large Monolithic Imager (LMI) on the 4.3m Discovery Channel Telescope (DCT) at Happy Jack, AZ from 2014/12/07 11:01 until 2014/12/07 11:08 UTC (starting 119.74 hours after the observations reported by Golenetskii et al. in GCN 17131). A source is clearly detected at the location of the source identified by UVOT in u', g', r', i' and z'. Using nearby point sources from SDSS for calibration we measure r' = 20.57 +/- 0.03. The coincident SDSS R10 source has r' = 22.65 +/- 0.20, confirming that the source is indeed transient. At 0.8 arcsecond seeing, the source is unresolved. This magnitude is reported in AB magnitude and is not corrected for Galactic extinction in the direction of the source. Further observations are planned to investigate possible variability of this source. We thank the staff of the Discovery Channel Telescope for assistance with these observations.