{
  "bibcode": "2011GCN.12760....1M",
  "body": "GRB 111228A: PAIRITEL NIR Detection\n\nA. N. Morgan (UC Berkeley) reports:\n\nWe observed the field of GRB 111228A (Ukwatta et al., GCN 12737) with\nthe 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began\nat 2011-12-29 06:55:25 UT, ~15.2 hours after the Swift Trigger.  In\nmosaics (effective exposure time of 0.46 hours) taken simultaneously\nin the J, H, and Ks filters, we marginally detect a source at the\noptical afterglow location (Ukwatta et al., GCN 12737; Xin et al., GCN\n12738; Klotz et al., GCN 12742; Pandey et al., GCN 12745; Nascimbeni\net al., GCN 12748; Xu et al. GCN 12750; Nysewander et al., GCN 12751;\nKuin & Ukwatta, GCN 12752; Gorosabel et al., GCN 12753; Hentunen et\nal., GCN 12754; Sinykov et al., GCN 12756; Guelbenzu et al., GCN\n12757).\n\nThe preliminary photometry yields:\n\npost burst\nt_mid (hr) exp.(hr) filt  mag    m_err\n15.56      0.46     J     18.3   0.2\n15.56      0.46     H     17.8   0.3\n15.56      0.46     Ks    16.2   0.3\n\nAll magnitudes are given in the Vega system, calibrated to 2MASS. No\ncorrection for Galactic extinction has been made to the above reported\nvalues. Further observations are ongoing.",
  "circularId": 12760,
  "createdOn": 1325146698000,
  "email": "qmorgan@gmail.com",
  "subject": "GRB 111228A: PAIRITEL NIR Detection",
  "submitter": "Adam Morgan at U.C. Berkeley  <qmorgan@gmail.com>",
  "eventId": "GRB 111228A"
}