{
  "bibcode": "2010GCN.10324....1M",
  "body": "A. N. Morgan, S. B. Cenko, J. S. Bloom, (UC Berkeley), report:\n\nWe observed the field of GRB 100111A (Vetere et al., GCN 10317) with\nthe 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began\nat 2010-01-11 12:20:11 UT, ~8.12 hours after the Swift trigger.\nObservations were taken under good weather conditions but at high\nairmass before dawn.  In mosaics (effective exposure time of ~2223\nseconds) taken simultaneously in the J, H, and Ks filters, we do not\ndetect the optical afterglow (Vetere et al., GCN 10317; Xu et al., GCN\n10318; Hoversten et al., GCN 10323).\n\nThe preliminary photometry yields:\n\npost_burst\nt_mid(h)    exp(s)  filt    U. Limit (3 sig)\n8.60        2223    J       > 19.0\n8.60        2223    H       > 18.5\n8.60        2223    Ks      > 18.0\n\nAll magnitudes given in the Vega system, calibrated to 2MASS.  No\ncorrection for Galactic extinction has been made to the above reported\nvalues.",
  "circularId": 10324,
  "createdOn": 1263249356000,
  "email": "qmorgan@gmail.com",
  "subject": "GRB 100111A: PAIRITEL NIR Upper Limits",
  "submitter": "Adam Morgan at U.C. Berkeley  <qmorgan@gmail.com>",
  "eventId": "GRB 100111A"
}