{
  "bibcode": "2006GCN..4861....1C",
  "body": "H.-W. Chen (U Chicago), X. Fan (U Arizona), F. Hearty (Colorado), M. Bayliss \n(Chicago), D. Q. Lamb (U Chicago), R. McMillan (APO), B. Ketzeback (APO), J. \nBarentine (APO), J. Dembicky (APO), and D. York (U Chicago) report:\n\n\"We obtained a 3x300 sec dithered exposures in Ks of the field of\nGRB060306 (Angelini et al., GCN 4848), using the NIC-FPS near-infrared camera \non the 3.5 m telescope at the Apache Point Observatory.  The\nobservations started at 20060306.10 UT (~ 2 hrs after the initial\nSwift trigger) through variable clouds and under a mean seeing\ncondition of 1 arcsec.  Calibrating the final stacked image to 2MASS\nstars in the field gives a 5 sigma depth of Ks=20.4 over a 1 arcsec diameter \naperture.  Within the XRT error circle (Page et al., GCN 4850), we locate a \nsingle source at\n\n \t\tRA(J2000)  = 02:44:23.0\n \t\tDec(J2000) = -02:08:51.2,\n\nwhich is also present in the DSS red plate (see also Price et al.,\nGCN 4854, and Nysewander et al., GCN 4857).  Based on the 2MASS photometry, \nwe estimate the source brightness to be Ks=18.3 +/- 0.1 mag.  Comarison with \nthe Ks image taken a day later by Nysewander et al. (GCN4857) shows no \nvariability of this source.\n\nThe stacked image is available at \nhttp://lambda.uchicago.edu/public/grb/grb060306/grb060306K.fits.\n\nNIC-FPS is currently in its commissioning phase.\"",
  "circularId": 4861,
  "createdOn": 1142138498000,
  "email": "hchen@oddjob.uchicago.edu",
  "subject": "GRB060306: APO Ks-band Imaging Observations",
  "submitter": "Hsiao-Wen Chen at U Chicago  <hchen@oddjob.uchicago.edu>",
  "eventId": "GRB 060306"
}