{
  "bibcode": "2013GCN.15148....1T",
  "body": "A. Trotter, J. Haislip, A. LaCluyze, J. Moore, N. Frank, D. Reichart, T. \nBerger, H. T. Cromartie, R. Egger, A. Foster, K. Ivarsen, M. Maples, M. \nNysewander, and J. A. Crain report:\n\nSkynet observed the Swift/BAT localization of GRB 130831A (Hagen et al., \nGCN 15139, Swift trigger #568849) with four 17\" telescopes of the \nnewly-commissioned PROMPT array at Siding Spring Observatory, NSW, \nAustralia. Starting at 2013-08-31, 13:39 UT and continuing until 17:41 \nUT (t=35.5m-4.65h post-trigger), it took 615 80-s exposures in the BVRI \nbands. We detect a bright fading afterglow in all four bands at RA \n23:54:29.8, Dec 29:25:46.4 (J2000.0), within the error circle of the \nEnhanced Swift-XRT localization (Evans et al., GCN 15147).\n\nA preliminary light curve is at:\nhttp://skynet.unc.edu/grb/grb130831a.png\n\nMagnitudes are in the Vega system, calibrated to 6 APASS stars in the \nfield, and have not been corrected for the modest expected line-of-sight \nMilky Way dust extinction E(B-V)=0.046 (Schlegel et al. 1998).\n\nSkynet observations are ongoing.",
  "circularId": 15148,
  "createdOn": 1377983332000,
  "email": "atrotter@physics.unc.edu",
  "subject": "GRB 130831A: Skynet/PROMPT-SSO detections",
  "submitter": "Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter@physics.unc.edu>",
  "eventId": "GRB 130831A"
}