{
  "bibcode": "2008GCN..8627....1U",
  "body": "A. Updike (Clemson University), C. Clemens, and J. Greiner (both MPE\nGarching) report on behalf of the GROND team:\n\nWe observed the field of GRB 081204 (INTEGRAL trigger #5385; D. Gotz et\nal., GCN #8614) for two epochs simultaneously in g'r'i'z'JHK with GROND\n(Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI\ntelescope at La Silla Observatory (Chile).\n\nObservations began at 00:30 UT on Dec 5, 2008, 7.75 hr after the GRB\ntrigger, and consisted of 2.4 hours of exposures.  The second epoch began\nat 00:31 UT on Dec 6, 31.75 hr after the trigger, and consisted of 1.3\nhours of exposures. Observations were performed under favorable sky\nconditions.\n\nWe detect two sources within the refined 5.3'' Swift-XRT error circle\nreported by V. Mangano et al. (GCN #8620), at the astrometrically\ncorrected positions:\n\nRA (J2000.0) 23h 19m 09.10s\nDec (J2000.0) -60d 13' 29.7\"\n\nand\n\nRA (J2000.0) 23h 19m 09.37s\nDec (J2000.0) -60d 13' 31.2\"\n\nThe second candidate agrees with the position reported by Berger & Rest\n(GCN #8624).\n\nWe detect no evidence of fading in either source between the two epochs.\nTherefore, we suggest that neither of the sources are the afterglow of\nGRB 081204.\n\nOur upper limits from the first epoch in g'r'i'z'JHK are as follows:\n\ng' > 24.2\nr' > 24.3\ni' > 23.6\nz' > 22.9\nJ  > 20.7\nH  > 19.4\nK  > 18.3\n\nThe given magnitudes are calibrated against GROND zeropoints as well as\n2MASS field stars.",
  "circularId": 8627,
  "createdOn": 1228563959000,
  "email": "aupdike@clemson.edu",
  "subject": "GRB 081204: GROND Observations",
  "submitter": "Adria C. Updike at Clemson U  <aupdike@clemson.edu>",
  "eventId": "GRB 081204"
}