{
  "bibcode": "2009GCN.10039....1F",
  "body": "R. Filgas, T. Kruehler, A. Yoldas (all MPE Garching),\nS. Klose (TLS Tautenburg), and\nJ. Greiner (MPE Garching), report on behalf of the GROND team:\n\nGROND (Greiner et al. 2008, PASP 120, 405), the 7-channel imager mounted\nat the 2.2m ESO/MPI telescope at La Silla Observatory (Chile), started\nfollow-up observations of GRB 091018 (Stamatikos et al. 2009, GCN 10034)\non October 18, at 23:47 UTC (~4 hrs after the burst).\n\nFor the afterglow candidate reported by Stamatikos et al. we\nestimate the following preliminary magnitudes (in the AB system):\n\ng'= 19.061 +/- 0.010\nr'= 18.853 +/- 0.007\ni'= 18.732 +/- 0.013\nz'= 18.70  +/- 0.10\nJ = 18.3   +/- 0.1\nH = 18.2   +/- 0.1\nK = 17.9   +/- 0.1\n\ncalibrated against GROND zeropoints.",
  "circularId": 10039,
  "createdOn": 1255918431000,
  "email": "filgas@mpe.mpg.de",
  "subject": "GRB 091018: GROND observations",
  "submitter": "Robert Filgas at MPI  <filgas@mpe.mpg.de>",
  "eventId": "GRB 091018"
}