{
  "bibcode": "2011GCN.12001....1U",
  "body": "Adria C. Updike (NASA/GSFC), D. A. Kann (TLS Tautenburg), Dieter H.\nHartmann (Clemson University), and Ken Rumstay (Valdosta State University)\nreport:\n\nWe observed the field of GRB 110503A (M. Stamatikos et al., GCN 11991)\nwith the SARA-North 0.9m telescope located at KPNO under good conditions\nbeginning about 13 hours after the trigger and continuing for half an\nhour.  We detect the afterglow in each 120 sec exposure.  In a stacked 20\nmin image with mean time 0.5484375 days after the trigger, we detect the\nafterglow at R = 20.20 +/- 0.07 using the SDSS-derived magnitude of the\ncomparison star given by Kann et al. (GCN 11996).  Further observations\nare planned.\n\nThe comparison star utilized by Kann et al. has the following SDSS\nmagnitudes (transformation from Lupton (2005) and Jordi et al. (2006):\n\nu = 21.214\ng = 18.546\nr = 17.166\ni = 16.485\nz = 16.111\n\nand Vega magnitudes:\n\nU = 20.431\nB = 19.193\nV = 17.802\nR = 16.819\nI = 15.942\nZ = 15.562",
  "circularId": 12001,
  "createdOn": 1304529185000,
  "email": "aupdike@clemson.edu",
  "subject": "GRB 110503A: SARA-N Observations and Photometric Calibration",
  "submitter": "Adria C. Updike at Clemson U  <aupdike@clemson.edu>",
  "eventId": "GRB 110503A"
}