{
  "bibcode": "2010GCN.10545....1U",
  "body": "A. Updike (Clemson University), M. Nardini, A. Rau, F. Olivares, and\nJ.Greiner (all MPE Garching) report on behalf of the GROND team:\n\nWe observed the field of GRB 100324A (ground analysis of Swift/BAT\ndata, Cummings et al., GCN #10544) simultaneously in g'r'i'z'JHK with\nGROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPI/ESO\ntelescope at La Silla Observatory (Chile). Observations started on 24\nMarch 2010 at 23:41 UT, 23.3 hours after the GRB. The field was\nobserved during a second epoch, starting at 00:10 UT on 26 March 2010,\n47.9 hours after the burst.\n\nOur i'-band and H-band observations cover 95% and 100% of the 2.5' BAT\nerror circle, respectively. Image subtraction between the two\nobserving epochs does not reveal any variable source. The first image,\nconsisting of 24.8 min exposure in g'r'i'z' and 20 min in JHK, yields\nthe following 3-sigma upper limits (both AB magnitudes):\n\ni' > 23.6 mag\nH > 21.6 mag\n\nwhich were obtained using the GROND zero points and 2MASS field stars\nas reference. The given magnitudes are not corrected for the\nsignificant Galactic extinction corresponding to a reddening of E(B-V)\n= 0.71 mag (Schlegel et al. 1998).",
  "circularId": 10545,
  "createdOn": 1269611980000,
  "email": "felipe@mpe.mpg.de",
  "subject": "GRB 100324A: GROND observations",
  "submitter": "Felipe Olivares Estay at MPE  <felipe@mpe.mpg.de>",
  "eventId": "GRB 100324A"
}