TITLE: GCN CIRCULAR NUMBER: 10015 SUBJECT: GRB 090530A: Skynet/DSO Detections DATE: 09/10/11 21:25:05 GMT FROM: Aaron LaCluyze at U.North Carolina A. Smith, A. LaCluyze, D. Reichart, D. Caton, L. Hawkins, J. Haislip, K. Ivarsen, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report: Skynet observed the Swift/BAT localization of GRB 090530A (Cannizzo et al., GCN 9438) with the 14" Dark Sky Observatory telescope in North Carolina beginning 61.8 minutes after the trigger in RI. We detect the afterglow (Cannizzo et al., GCN 9438). Stacking only images that increase the limiting magnitude yields: mean 1-sig. 1-sig. time sys. stat. since cal. cal. cal. trig. tel. exp. fil. magnitude stars* unc. unc. (m) (# x s) (mag) (mag) 88.8 DSO-14 20 x 80 I 19.26 +0.32 -0.25 7 SDSS 7 0.050 0.001 102.2 DSO-14 23 x 80 R 19.53 +0.16 -0.14 10 SDSS 7 0.022 0.001 * Transformed using Jester et al., 2005, ApJ, 130, 873.