GCN Circular 4050
Subject
GRB 051001: ROTSE-III Optical Limits
Date
2005-10-01T11:50:50Z (19 years ago)
From
Eli Rykoff at U of Michigan/ROTSE <erykoff@umich.edu>
E.S. Rykoff (U Mich), H. Swan (U Mich), B. Schaefer (Louisiana State),
S.A. Yost (U Mich), F. Yuan (U Mich) report on behalf of the ROTSE
collaboration:
ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded
to GRB 051001 (Swift trigger 157870), producing images beginning 7.9 s
after the GCN notice time. An automated response took the first image at
11:13:01.9 UT, 85.6 s after the burst, under fair conditions. We took 10
5-sec, 10 20-sec and 20+ 60-sec eposures. Observations are ongoing.
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 BAT error circle (or the possible X-ray position from the GCN
notice), for both single images and coadding into sets of 10. Individual
images have limiting magnitudes ranging from 16.1-17.4; we set the
following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
11:13:01.9 11:13:06.9 5 16.2 85.6 N
11:13:01.9 11:15:25.9 144 17.7 85.6 Y
11:15:26.6 11:20:19.6 293 18.1 230.3 Y