{
  "bibcode": "2011GCN.11675....1C",
  "body": "B. E. Cobb (GWU) reports:\n\nUsing the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained\noptical/IR imaging of the error region of GRB 110206A (GCN 11654,\nMereghetti et al.) with a mid-exposure time of 34.2 hours post-burst\n(2011-02-08 04:22 UT).  Total summed exposure times amounted to\n36 minutes in I and 30 minutes in J.\n\nIn agreement with Elliott et al. (GCN 11669), we observe that the\ncandidate optical afterglow of GRB 110206A (GCN 11662, Hoversten et al.\nand GCN 11665, Elliott et al.) has decayed significantly from our\nprevious observations (GCN 11668), indicating that this is the optical\nafterglow of GRB 110206A.  Preliminary comparison to Landolt standard\nstars indicates the following magnitude for the optical afterglow:\n\ntime post-burst       I mag\n 6.8 hours              20.6+/-0.1\n34.2 hours             21.6+/-0.2\n\nThis indicates that the decay rate of the burst between ~7 and 34 hours\npost burst is alpha ~ 0.6 (where afterglow flux is proportional\nto t^-alpha).",
  "circularId": 11675,
  "createdOn": 1297203872000,
  "email": "bcobb@gwu.edu",
  "subject": "GRB 110206A: SMARTS optical/IR afterglow decay",
  "submitter": "Bethany Cobb at GWU  <bcobb@gwu.edu>",
  "eventId": "GRB 110206A"
}