H. Swan (U Mich), T.A. McKay (U Mich), D.A. Smith (Guilford), B.
Schaefer (Louisiana State), E.S. Rykoff (U Mich), F. Yuan (U Mich),
report on behalf of the ROTSE collaboration:
ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded
to GRB 051021 (HETE trigger 3947). The first image was at 13:22:28.4 UT,
31.8 s after the burst (6.6 s after the GCN notice time). The unfiltered
images are calibrated relative to USNO A2.0. We confirm the presence of
the source detected by Fox et. al. GCN # 4120. We observe the source to
rise to 16.9 magnitude, at about 180 seconds, and then fade by half a
magnitude over a period of 150 seconds.
This source is not visible in DSS (second epoch), 2MASS or the MPChecker
Continuing observations are in progress.