{
  "bibcode": "2011GCN.11861....1M",
  "body": "A. N. Morgan, C. R. Klein, and J. S. Bloom (UC Berkeley) report:\n\nWe observed the field of GRB 110402A (Ukwatta et al., GCN 11857) with\nthe 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began\nat 2011-04-02 04:28:41 UT, ~4.26 hours after the Swift Trigger.  In\nmosaics (effective exposure time of 0.63 hours) taken simultaneously\nin the J and H filters, we do not detect any source at the optical\nafterglow location (Mundell et al., GCN 11858, Leloudas et al., GCN\n11859).  Our preliminary Ks band reduction is corrupted.\n\nThe preliminary photometry yields:\n\npost burst\nt_mid (hr) exp.(hr) filt  U. Limit (3 sig)\n4.77       0.63     J     > 19.1\n4.77       0.63     H     > 18.2\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": 11861,
  "createdOn": 1301724156000,
  "email": "qmorgan@gmail.com",
  "subject": "GRB 110402A: PAIRITEL NIR Upper Limits",
  "submitter": "Adam Morgan at U.C. Berkeley  <qmorgan@gmail.com>",
  "eventId": "GRB 110402A"
}