{
  "bibcode": "2017GCN.20673....1J",
  "body": "K. L. Murata (Nagoya U), L. Townsend (UCT), I. Monageng (SAAO), Y. Moritani\n(Kavli IPMU), M. Jian (U of Tokyo), S. Chimasu (Tokai U), A. Kawachi (Tokai\nU), A. Okazaki (Hokkai-Gakuen U) and T. Nagayama (Kagoshima U)\n\nWe observed the field of GRB 170208B (Siegel et al., GCN Circular #20632)\nwith the near-infrared (J, H, Ks) simultaneous imaging camera SIRIUS\nattached to 1.4 m telescope IRSF (InfraRed Survey Facility) in Sutherland\nobservatory, South Africa.\n\nThe observations started on 2017-02-08 22:49:41 UT (~ 15 min. after the\nburst). We could not detect the afterglow within the enhanced XRT error\ncircle (Goad et al., GCN Circular #20635) in the three bands. We have\nobtained the following preliminary upper limits (Vega magnitude system):\n\n J > 16.83\n H > 16.31\n Ks > 16.30\n\nGiven magnitudes were calibrated against 2MASS point sources in this field.\nThe upper limits were determined as the magnitudes of the faintest star\nwithin 1 arcmin from the enhanced XRT position.\n\nThis observation was carried out by IRSF and OISTER collaboration.",
  "circularId": 20673,
  "createdOn": 1487057336000,
  "email": "murata@u.phys.nagoya-u.ac.jp",
  "subject": "GRB 170208B: IRSF upper limits",
  "submitter": "Katsuhiro L. Murata at Nagoya U  <murata@u.phys.nagoya-u.ac.jp>",
  "eventId": "GRB 170208B"
}