GCN Circular 8399
Subject
GRB 081024A: ROTSE-III Optical Limits
Date
2008-10-24T06:33:52Z (16 years ago)
From
Brad Schaefer at LSU <schaefer@grb.phys.lsu.edu>
B. E. Schaefer (Louisiana State), E.S. Rykoff (UCSB), H. Swan (U Mich), W.
Rujopakarn (Steward), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
081024A (Swift trigger 332516; G. Stratta, GCN 8398), producing images
beginning 9.1 s after the GCN notice time. An automated response took the
first image at 05:53:37.2 UT, 28.4 s after the burst, under excellent
conditions. We took 10 5-sec, 10 20-sec and 40 60-sec exposures. These
unfiltered images are calibrated relative to USNO A2.0 (R). Imaging is on
going.
Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma Swift/BAT error circle or the XRT error circle, for both single
images and coadding into sets of 10; however, we are limited as the field
is somewhat crowded. Individual images have limiting magnitudes ranging
from 16.1-17.1; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
05:53:37.1 05:53:42.1 5 16.2 28.3 N
05:54:57.0 05:59:37.7 280 17.2 108.2 Y