{
  "bibcode": "2010GCN.10675....1M",
  "body": "A. N. Morgan and J. S. Bloom (UC Berkeley) report:\n\nWe observed the field of GRB 100424A (Hoversten et al., GCN 10667)\nwith the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations\nbegan at 2010-04-25 03:51:19 UT, ~11.3 hours after the Swift Trigger,\nunder high airmass.  In  mosaics (effective exposure time of 0.74\nhours) taken simultaneously in the J, H, and Ks filters, we do not\ndetect any source within the enhanced XRT error circle (Evans et al.,\nGCN 10669).\n\nThe preliminary photometry yields:\n\npost burst\nt_mid (hr) exp.(hr) filt  U. Limit (3 sig)\n11.81      0.74     J     > 19.3\n11.81      0.74     H     > 18.4\n11.81      0.74     Ks    > 17.0\n\nFurther observations are ongoing to obtain a deeper limit.  All\nmagnitudes are given in the Vega system, calibrated to 2MASS. No\ncorrection for Galactic extinction has been made to the above reported\nvalues.",
  "circularId": 10675,
  "createdOn": 1272176043000,
  "email": "qmorgan@gmail.com",
  "subject": "GRB 100424A: PAIRITEL NIR Upper Limits",
  "submitter": "Adam Morgan at U.C. Berkeley  <qmorgan@gmail.com>",
  "eventId": "GRB 100424A"
}