{
  "bibcode": "2004GCN..2714....1R",
  "body": "Rykoff, E. S., Quimby, R. & Schaefer, B. E. Report on behalf of the \nROTSE Collaboration:\n \n\nROTSE-IIIb at McDonald Observatory, Texas, responded automatically to \nthe HETE Ground alert #3558.  The first exposure began at 02:29:48.2 \n(UTC), approximately 2.4 hours after the burst time reported by Yamazaki \net al. (GCN Circ. 2712, 2713).  The ROTSE-IIIb system automatically \nscheduled a series of 10 20-s images followed by a long series of 60-s \nimages.  As of this writing, we have analyzed 40 images.  We have also \nco-added sets of 10 images.  Our unfiltered limiting magnitudes are \naround 18.3 for the single exposures, and 19.2 for the co-added frames. \n  Visual comparison of the co-added frames to the DSS reveals 3 new \nobjects in the HETE-2 error circle reported in GCN Circ. 2712.  These \nthree sources are identified as asteroids by their proper motion, and \nare in the MpChecker database (Ruanda, 1997 WZ36, and 2004 PN39).  At \nthis time, we have no candidate counterparts to the GRB.",
  "circularId": 2714,
  "createdOn": 1095310334000,
  "email": "erykoff@umich.edu",
  "subject": "ROTSE-IIIb Observations of GRB 040916 (HETE #3558)",
  "submitter": "Eli Rykoff at Univ. of Michigan/ROTSE  <erykoff@umich.edu>",
  "eventId": "GRB 040916"
}