{
  "bibcode": "2004GCN..2595....1S",
  "body": "D. A. Smith (NSF/U of Michigan) reports on behalf of the ROTSE collaboration:\n  \nThe ROTSE-IIIa telescope (at SSO, Australia) responded rapidly to both the\nintitial on-board alert and the final ground analysis alert distributed by\nHETE-2 for GRB 040511 (HETE #3218, Dullighan et al., GCN Circ. #2588).  In both\ncases, the first ROTSE-IIIa exposure began within 3.5 s of the alert time\nstamp.  The final SXC localization was outside the field of view of the first\nseries of ROTSE-IIIa images, so those data are not included in this report.\nThe second series of images began at 15:11:34.57 UTC, ~2.2 h after the burst\ntrigger time.  The instrument responded automatically with a pre-programmed\nsequence of ten 5-s and ten 20-s images, after which it recorded 44 60-s\nimages.  The first 60 images were co-added in sets of ten, reaching limiting\nmagnitudes of ~17.2 for the 5-s images and ~17.5 for the others.  (ROTSE-III\nimages are unfiltered, but calibrated to USNO A2.0 R-band.)  Comparison of\nthese images to the USNO catalogs and the DSS 2nd Generation R-band image\nreveal no new sources.  The detected foreground sources are estimated to cover\n~10-15% of the SXC error circle.\n\nIn short, ROTSE-IIIa provides the following approximate R-band upper limits\n(the first column is the elapsed time to the middle of the co-added exposure):\n\nTime from              Exp. Time            Upper Limit\nBurst Trigger\n(hours)                 (sec)\n2.18                      50                    17.2\n2.24                     200                    17.5\n2.37                     600                    17.5\n2.57                     600                    17.5\n2.76                     600                    17.6\n2.95                     600                    17.5",
  "circularId": 2595,
  "createdOn": 1084465396000,
  "email": "dasmith@rotse2.physics.lsa.umich.edu",
  "subject": "GRB 040511:  ROTSE-III Rapid Optical Upper Limits",
  "submitter": "Don Smith at U michigan  <dasmith@rotse2.physics.lsa.umich.edu>",
  "eventId": "GRB 040511"
}