{
  "bibcode": "2013GCN.15166....1M",
  "body": "G. Masi (Ceccano, Italy) and F. Nocentini (Frosinone, Italy)\nreport:\n\nOn Sept 1.9197 2013 UT, we imaged the field around GRB\n130831A (GCN 15139) \nremotely using the the 0.43m-f/6.8 robotic unit part of the\nVirtual\nTelescope robotic facility in Italy, about 33 hours after\nthe burst.\n\nWe co-added 12, 300-seconds unfiltered CCD images and\ndetected the afterglow at the same position we gave in GCN\n15152. \n\nWe performed photometry, assuming R-mags from UCAC-4 for the\nstars in the\nfield, getting an estimate for the magnitude of 20.7 (CR).",
  "circularId": 15166,
  "createdOn": 1378120906000,
  "email": "gianluca@bellatrixobservatory.org",
  "subject": "GRB 130831A: Optical Observations via Virtual Telescope, follow-up",
  "submitter": "Gianluca Masi at Bellatrix Astronomical Obs  <gianluca@bellatrixobservatory.org>",
  "eventId": "GRB 130831A"
}