{
  "bibcode": "2009GCN..9242....1I",
  "body": "M. Im, Y. Jeon, C. Choi, W. Park, I. Lee Seoul National Univ),\n  Y.-B. Jeon (KASI) and Y. Urata (NCU) on behalf of EAFON team.\n\n  The Y-band calibration data reported earlier by Im et al.\n  (GCN 9221) have been updated with a revised zero point,\n  and the catalog now includes more objects.\n\n  The updated field calibration data are available\n  at the same location as before:\n\n  http://astro.snu.ac.kr/~mim/grb/readme\n  http://astro.snu.ac.kr/~mim/grb/grb090423_ycal.dat\n  http://astro.snu.ac.kr/~mim/grb/yobj.reg\n  http://astro.snu.ac.kr/~mim/grb/chart.gif\n\n  We thank the LOAO operator, J. Yoon for his assistance for this\n  observation.",
  "circularId": 9242,
  "createdOn": 1240626663000,
  "email": "mim@astro.snu.ac.kr",
  "subject": "GRB 090423: Y-band field calibration update/correction",
  "submitter": "Myungshin Im at Seoul Nat U  <mim@astro.snu.ac.kr>",
  "eventId": "GRB 090423"
}