GCN Circular 10729
Subject
GRB 100508A: ROTSE-III Optical Limits
Date
2010-05-08T10:19:32Z (14 years ago)
From
Brad Schaefer at LSU <schaefer@grb.phys.lsu.edu>
B. E. Schaefer (Louisiana State), L. Xiao (Louisiana State), S. B. Pandey
(U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIa, located at Siding Spring Observatory, Australia, responded to
GRB 100508A (Swift trigger 421386; Margutti et al., GCN 10728), producing
images beginning 156.8 s after the GCN notice time. An automated response
took the first image at 09:23:19.1 UT, 156.8 s after the burst, under fair
conditions. We took 10 5-sec, 10 20-sec and 10 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; the field is not
crowded. Individual images have limiting magnitudes ranging from
16.3-16.6; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
09:25:55.9 09:26:15.9 20 16.5 156.8 N