{
  "bibcode": "2009GCN..9408....1R",
  "body": "A. Rossi (Tautenburg), T. Kruehler, J. Greiner and A. Yoldas (all MPE Garching)\nreport on behalf of the GROND team:\n\nWe observed the field of GRB 090519 (Swift trigger 352648, M. Perri et al.,\nGCN #9400) simultaneously in g'r'i'z'JHK with GROND mounted at the 2.2m\nESO/MPI telescope at La Silla Observatory (Chile). Observations started on\n19 May 2009 at 23:44 UT, 2.5 h after the burst, under challenging sky \nconditions with cirrus.\n\nWe detect the afterglow at a position consistent with the enhanced XRT error \ncircle and NOT (Thoene et al., GCN #9403). With an exposure time of 40min in \nJHK and 49min in griz, preliminary photometry yields the following AB \nmagnitudes:\n \ng =25.0 +-0.4\nr =23.5 +-0.2\ni =23.5 +-0.3\nz >23.6\nJ >21.9\nH >20.7\nK >19.9\n\ncalibrated using SDSS and 2MASS field stars. The quoted magnitudes are not \ncorrected for the galactic foreground extinction corresponding to a \nreddening of E_(B-V)=0.04.\n\nThe large g-i color as compared to r-i indicates that the Lyman break may\nbe located in the g' band. Fitting the SED with Hyper-Z results in a \npreliminary photometric redshift of z = 3.9+0.4-0.7, assuming no intrinsic \nextinction.",
  "circularId": 9408,
  "createdOn": 1242806524000,
  "email": "jcg@mpe.mpg.de",
  "subject": "GRB 090519: GROND observation",
  "submitter": "Jochen Greiner at MPI  <jcg@mpe.mpg.de>",
  "eventId": "GRB 090519"
}