{
  "bibcode": "2010GCN.10592....1F",
  "body": "Robert Filgas, Thomas Kruehler, Jochen Greiner and Abdullah Yoldas (all \nMPE Garching) report on behalf of the GROND team:\n\nWe observed the field of GRB 100413A (Swift trigger 419404; Holland et \nal., GCN #10581) simultaneously in g'r'i'z'JHK with GROND (Greiner et \nal., 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La \nSilla Observatory (Chile).\n\nObservations started at 05:43 UT on April 14, 12 hours after the GRB \ntrigger, and continued for 2.5 hours. They were performed at an average \nseeing of 1\" under clear sky conditions.\n\nIn stacked images of 125 min total integration time in g'r'i'z' and 100 \nmin in JHK, we do not detect a source within the Swift/XRT error circle \n(Goad et al., GCN #10584) down to the following 3 sigma limiting \nmagnitudes (all in the AB system):\n\ng' > 25.3,\nr' > 25.2,\ni' > 24.6,\nz' > 24.3,\nJ > 22.5,\nH > 22.1 and\nK > 21.1\n\nThese limits were derived by calibrating the images against the GROND \nzeropoints and 2MASS field stars and are not corrected for the Galactic \nforeground extinction corresponding to a reddening of E_(B-V)= 0.11 in \nthe direction of the burst (Schlegel et al. 1998).",
  "circularId": 10592,
  "createdOn": 1271265042000,
  "email": "kruehler@mpe.mpg.de",
  "subject": "GRB 100413A: GROND Upper limits",
  "submitter": "Thomas Kruehler at MPE/MPI  <kruehler@mpe.mpg.de>",
  "eventId": "GRB 100413A"
}