{
  "bibcode": "2013GCN.14826....1T",
  "body": "A. Trotter, A. LaCluyze, D. Reichart, J. Haislip, T. Berger, M. Carroll, \nH. T. Cromartie, R. Egger, A. Foster, C. Foster, N. Frank, K. Ivarsen, \nD. James, M. Maples, J. Moore, M. Nysewander, E. Speckhard, P. Taylor \nand J. A. Crain report:\n\nSkynet continued observing the field of GRB 130606A (Ukwatta et al., GCN \n14781, Swift trigger #557589), using the optical localization of Xu et \nal. (GCN 14783).  It took 109 160-second exposures in the z' band with \none of the 16\" telescopes of the PROMPT array at CTIO, Chile, with a \nmean time t=1.3d post-trigger.\n\nIn a stack of all 109 exposures, we detect the afterglow at the 5-sigma \nlevel, with z'~20.5 at t=1.3d.  Together with the z' detections we \nreported in Trotter et al. (GCN 14815), this implies an approximate \ntemporal index alpha~-1.2.   A preliminary light curve of both nights' \ndata is at:\nhttp://www.skynet.unc.edu/grb/grb130606a_2.png\n\nPhotometry is calibrated to 10 SDSS stars in the field; g' and z' \nmagnitudes are in the AB system; R-band magnitudes are in the Vega \nsystem, with the SDSS calibration stars transformed according to Jester \n(2005).  No correction has been applied for the expected line-of-sight \nMilky Way extinction of E(B-V)=0.02 (Schlegel et al. 1998).\n\nNo further Skynet observations are scheduled.",
  "circularId": 14826,
  "createdOn": 1370715681000,
  "email": "atrotter@physics.unc.edu",
  "subject": "GRB 130606A: Continued Skynet/PROMPT observations",
  "submitter": "Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter@physics.unc.edu>",
  "eventId": "GRB 130606A"
}