{
  "subject": "GRB 100902A: UKIRT JK Observation",
  "eventId": "GRB 100902A",
  "bibcode": "2010GCN.11210....1I",
  "createdOn": 1283670632000,
  "circularId": 11210,
  "submitter": "Myungshin Im at Seoul Nat U  <mim@astro.snu.ac.kr>",
  "email": "mim@astro.snu.ac.kr",
  "body": "Myungshin Im, Changsu Choi, Hyunsung Jun, Eugene Kang (CEOU/Seoul\n  National University), Y. Urata (NCU), P. Choi (Pomona College),\n  and  T. Sakamoto (NASA/GSFC), on behalf of a larger collaboration\n\n   We observed GRB 100902A (Sakamoto et al. GCN 11181) in J and K filters\n  using UKIRT. The observation started at Sept. 04, 14:24:39 UT or roughly\n  1.79 days after the BAT alert.\n   The reduced images with non-optimal calibration frames do not show a clear\n  sign of the afterglow candidate reported in Updike et al.\n  (GCN 11209), although both the J and K images show a faint smudge at\n  the reported location which may corresponds to the afterglow.\n   The significance of the detection is only ~3 sigma (J ~ 20.8 mag,\n  K ~ 19 mag in Vega), therefore it is difficult to draw a firm conclusion\n  on detection or non-detection of the afterglow in our data. Further\n  analysis of the UKIRT data is ongoing."
}