GCN Circular 5666

H. Swan (U. Michigan), W. Rujopakarn (U. Arizona), S.A. Yost (U.  
Michigan), E.S. Rykoff (U. Michigan), B. E. Schaefer (Louisiana  
State), report on behalf of the ROTSE collaboration:

ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded
to GRB 060930 (Integral trigger 3503), producing images beginning 6.3
s after the GCN notice time. An automated response took the first
image at 09:05:08.3 UT, 44.1 s after the burst, under fair conditions.
We took 10 5-sec, 10 20-sec and 80 60-sec exposures. These unfiltered
images are calibrated relative to USNO A2.0 (R).

Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma error circle, for both single images and coadding into sets of
10. Individual images have limiting magnitudes ranging from 15.8-17.1;
we set the following specific limits.

start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?
--------------------------------------------------------------------
09:05:08.3   09:05:13.3         5     15.8           44.1       N
09:05:08.3   09:07:44.3       156     17.1           44.1       Y