{
  "bibcode": "2010GCN.10869....1R",
  "body": "S.Rapoport, J. Scharwaechter, B.P. Schmidt, M.Dopita, M. Bessell\nRSAA, The Australian National University report\n\nWe observed the afterglow of the Swift GRB 100606A (S.R. Oates\net al. GCN 10824) with the Australian National University's \nWide-Field-Spectrograph\n(WiFeS)+2.3m telescope located at Siding Spring\nObservatory. WiFeS is a high throughput integral field spectrograph \nwhich covers a FoV of 25\"x38\"\n(Dopita, M., et al, , Ap&SS,310,255).\nThe spectra  were taken in poor conditions (FWHM 3 arcsec ) at the onset of\ntwilight, and cover the wavelength region 3200A-9300A\nat a resolution of 3000. Data were obtained  in two 900 second exposures\ncommencing at UT 19:49:20 Jun 6 (35 minutes after GRB trigger).\nTo maximize image depth, we stacked and remove spectra regions containing\nskylines to form g,r,i,z images. We did not detect any source within the XRT\nerror circle to limiting magnitudes (5-sigma) of\n\nFilter       Mag\n       (AB)\n===       ===\ng          >18.1\nr          >19.5\ni           >19.1\nz          >18.9\n\ncalibrated by comparison to a nearby spectrophometric standard star.\nThe values are not corrected for galactic extinction.",
  "circularId": 10869,
  "createdOn": 1277080422000,
  "email": "brian@mso.anu.edu.au",
  "subject": "GRB 100606A: Optical Limits",
  "submitter": "Brian Schmidt at RSAA, ANU (MSSSO)  <brian@mso.anu.edu.au>",
  "eventId": "GRB 100606A"
}