{
  "bibcode": "2017GCN.22192....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 171205A\n(GCN 22177, D'Elia et al.) with a mid-exposure time of about\n24.5 hrs post-burst (2017-12-06 07:50 UT). Total summed exposure\ntimes amounted to 15 min in V and I and 12 min in J and K.\n\nThe afterglow of GRB 171205A (e.g. GCN 22179, Osborne et al.;\nGCN 22180, Izzo et al.; GCN 22181, Emery et al.) was detected\nwith the following preliminary magnitudes:\n\nV mag = 18.5 +/- 0.1\nI mag = 17.7 +/- 0.1\nJ mag = 17.6 +/- 0.1\nK mag = 16.2 +/- 0.1\n\n(Optical photometry is calibrated against Landolt standard stars\nand IR photometry is calibrated against 2MASS stars in the\nfield.)",
  "circularId": 22192,
  "createdOn": 1512590918000,
  "email": "bcobb@gwu.edu",
  "subject": "GRB 171205A: SMARTS optical/IR afterglow observations",
  "submitter": "Bethany Cobb at GWU  <bcobb@gwu.edu>",
  "eventId": "GRB 171205A"
}