TITLE: GCN CIRCULAR NUMBER: 8617 SUBJECT: GRB 081203A: Skynet/GORT Detections DATE: 08/12/05 01:15:13 GMT FROM: James Philip West at UNC/Chapel Hill J. P. West, K. McLin, T. Brennan, J. Haislip, D. Reichart, L. Cominsky, T. Graves, G. Spear, K. Ivarsen, J. A. Crain, A. Foster, R. Holmes, A. LaCluyze, M. Schubel, J. Styblova, A. Trotter, and E. Weaver report: Skynet observed the localization of GRB 081203A (Parsons et al., GCN 8595) with the 14" GORT telescope at Hume Observatory in California beginning 122 seconds after the trigger (101 seconds after notification) in RI. Only five exposures were taken before morning twilight. We detect the afterglow (Parsons et al., GCN 8595) in all five exposures. Calibrated to five USNO B1 stars, we find: mean time since trigger exposure filter magnitude (sec) (sec) 134 20 I 12.79 +/- 0.02 235 40 R 12.60 +/- 0.01 345 40 I 11.58 +/- 0.01 476 80 R 12.51 +/- 0.01 625 80 I 12.02 +/- 0.01 [GCN OPS NOTE(05dec08): Per author's request, the "magnutude time" column label was changed to "magnitude".]