Rykoff, E. S., Quimby, R. & Schaefer, B. E. Report on behalf of the
ROTSE-IIIb at McDonald Observatory, Texas, responded automatically to
the HETE Ground alert #3558. The first exposure began at 02:29:48.2
(UTC), approximately 2.4 hours after the burst time reported by Yamazaki
et al. (GCN Circ. 2712, 2713). The ROTSE-IIIb system automatically
scheduled a series of 10 20-s images followed by a long series of 60-s
images. As of this writing, we have analyzed 40 images. We have also
co-added sets of 10 images. Our unfiltered limiting magnitudes are
around 18.3 for the single exposures, and 19.2 for the co-added frames.
Visual comparison of the co-added frames to the DSS reveals 3 new
objects in the HETE-2 error circle reported in GCN Circ. 2712. These
three sources are identified as asteroids by their proper motion, and
are in the MpChecker database (Ruanda, 1997 WZ36, and 2004 PN39). At
this time, we have no candidate counterparts to the GRB.