{
  "bibcode": "2008GCN..8079....1K",
  "body": "T. Kruehler, J. Greiner, F. Schrey, G. Sala, C. Clemens (all MPE Garching) \nreport on behalf of the GROND team:\n\nWe observed the field of the INTEGRAL GRB 080723B (Gotz et al. 2008, \nGCN #8002) on two epochs, simultaneously in g'r'i'z'JHK with GROND \n(Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m ESO/MPI telescope \nat La Silla Observatory (Chile). First observations started at \n2008-07-24 23:46 UT, 36.4 h after the burst, with total exposures of \n50 min in g'r'i'z' and 40 min in JHK. A second set of images was obtained \nstarting at 2008-07-31 23:39 UT with effective exposures of 100 min \n(g'r'i'z') and 80 min (JHK).\n\nWe do not detect a fading source in neither the XRT (Page 2008, GCN #8008) \nnor XMM (Sala et al. 2008, GCN #8078) error circle down to limiting \nmagnitudes of:\n\ng' > 23.4\nr' > 23.6\ni' > 22.7 \nz' > 22.7\nJ > 20.6\nH > 19.5\nK > 18.5\n\ncalibrated against USNO-B1 and 2MASS field stars. At longer wavelength,\nthese limits are compromised by the high density of foreground stars.\n\nThe reported upper limits are not corrected for the expected Galactic \nforeground extinction corresponding to a reddening of E_(B-V) = 1.3 \n(Schlegel et al. 1998).",
  "circularId": 8079,
  "createdOn": 1218226748000,
  "email": "jcg@mpe.mpg.de",
  "subject": "GRB 080723B: GROND upper limits",
  "submitter": "Jochen Greiner at MPI  <jcg@mpe.mpg.de>",
  "eventId": "GRB 080723B"
}