GCN Circular 6106
Subject
GRB 070219: ROTSE-III Optical Limits
Date
2007-02-19T02:33:38Z (17 years ago)
From
Heather Swan at U.of Michigan/ROTSE <hflewell@umich.edu>
H. Swan (U Mich), J. Aretakis (U Mich) report on behalf of the ROTSE
collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
070219 (Swift trigger 261132), producing images beginning 35 minutes
after the GCN notice time. An automated response took the first image
at 01:44:52.6 UT, 2076.5 s after the burst, under twilight
conditions. We took 10 5-sec, 10 20-sec and 6 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 error circle, for both single images and coadding into
sets of 10. Individual images have limiting magnitudes ranging from
15.8-17.0; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
01:44:52.6 01:45:52.6 60 16.4 2076.5 N
02:13:52.6 02:14:52.6 60 17.0 3816.5 N
01:51:50.6 02:03:17.4 686 17.8 2494.5 Y