{
  "bibcode": "2016GCN.20202....1C",
  "body": "B. E. Cobb (GWU), reports:\n\nUsing the ANDICAM instrument on the 1.3m telescope at CTIO, we\nobtained optical/IR imaging of the error region of GRB 161117A\n(GCN 20179, Cummings et al.) at two epochs (with mid-exposure times of\n2016-11-17 02:38 UT & 2016-11-18 01:47 UT). For each epoch, several\ndithered images were obtained with total summed exposure times of\n15 min in V and I and 12 min in J and K.\n\nThe fading afterglow of GRB 161117A (e.g. GCN 20179, Cummings et al.;\nGCN 20180, Malesani et al.; GCN 20181, D'Avanzo et al.) was detected\nwith the following preliminary magnitudes (or 3-sigma limits):\n\nmid-exposure\ntime post-burst\n(hours)            V mag            I mag             J mag             K\nmag\n1.03333          19.42+/-0.10  18.69+/-0.07  18.40+/-0.15  16.49+/-0.11\n\n24.19361        >22.3              >21.1             >18.5             >16.7\n\n(Optical photometry is calibrated against Landolt standard stars\nand IR photometry is calibrated against 2MASS stars in the field.)",
  "circularId": 20202,
  "createdOn": 1479777107000,
  "email": "bcobb@gwu.edu",
  "subject": "GRB 161117A: SMARTS optical/IR afterglow observations",
  "submitter": "Bethany Cobb at GWU  <bcobb@gwu.edu>",
  "eventId": "GRB 161117A"
}