GCN Circular 4664
Subject
GRB 060204C: ROTSE-III Optical Limits
Date
2006-02-04T21:55:29Z (19 years ago)
From
Eli Rykoff at U of Michigan/ROTSE <erykoff@umich.edu>
E.S. Rykoff (U Mich), S.A. Yost (U Mich), B. E. Schaefer (Louisiana
State), F. Yuan (U Mich), T. Guver (U Istanbul), report on behalf of the
ROTSE collaboration:
ROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe,
Turkey, responded to GRB 060204C (Swift trigger 180274, GCN 4663),
producing images beginning 6.8 s after the GCN notice time. An automated
response took the first image at 20:35:04.8 UT, 81.8 s after the burst,
under windy conditions. We took 10 5-sec, 10 20-sec and 31 60-sec
eposures. 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, for both single images and coadding into sets
of 10. Individual images have limiting magnitudes ranging from
16.1-17.7; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
20:35:04.8 20:35:09.8 5 16.1 81.8 N
20:35:04.8 20:37:11.5 126 17.7 81.8 Y
20:37:20.2 20:41:56.3 276 18.2 217.2 Y