{
  "bibcode": "2016GCN.19482....1Y",
  "body": "K. Yanagisawa, D. Kuroda, Y. Shimizu, H. Izumiura(OAO/NAOJ),\nM. Yoshida (Hiroshima), K. Ohta(Kyoto) and N. Kawai(Tokyo Tech.)\nreport on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 160601A (Kocevski et al., GCN 19478)\nin Ks-band with a wide-field near infrared imager at Okayama\nAstrophysical Observatory (Japan).  The imager has effective\naperture of 0.91 m.\n\nObservations started from 14:57 UT on 1st June, 14 min after\nthe BAT trigger, to 15:22 UT. The total exposure of 10.0 min\nwas successfully obtained.\n\nIn our co-add image, we did not find any new point source within\nthe XRT error circle down to the limiting magnitude of\nKs=16.1 (Vega, S/N=3). The photometric calibration was made\nagainst 2MASS field stars.\n\nT0+[sec]    MID-UT     T-EXP[sec]      Ks\n---------------------------------------------------\n   +1,560    15:09      600.0          >16.1\n---------------------------------------------------\nT0+ : Elapsed time after the burt [sec]\nT-EXP: Total Exposure time [sec]",
  "circularId": 19482,
  "createdOn": 1464800981000,
  "email": "yanagi@oao.nao.ac.jp",
  "subject": "GRB 160601A: MITSuME Okayama Ks-band upper-limit",
  "submitter": "Kenshi Yanagisawa at OAO/NAOJ  <yanagi@oao.nao.ac.jp>",
  "eventId": "GRB 160601A"
}