[vsnet-grb-info 1974] GRB 050815: ROTSE-III Optical Limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Tue Aug 16 07:00:29 JST 2005
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 3813
SUBJECT: GRB 050815: ROTSE-III Optical Limits
DATE: 05/08/15 21:58:18 GMT
FROM: Eli Rykoff at U of Michigan/ROTSE <erykoff at umich.edu>
Fang Yuan, E.S. Rykoff (U Mich) report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to GRB 050815 (Swift trigger 150532), producing images
beginning 7.2 s after the GCN notice time. An automated response took
the first image at 17:25:54.2 UT, 35.5 s after the burst, under fair
conditions. We took 10 5-sec, 10 20-sec and 130 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; however, we are limited as the field is severely crowded.
Furthermore, we do not detect any new objects in the XRT error circle
(Morris et al, GCN 3812). Individual images have limiting magnitudes
ranging from 14.9-15.8; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
17:25:54.2 17:25:59.2 5 14.9 35.5 N
17:25:54.2 17:27:25.2 91 15.8 35.5 Y
17:27:25.9 17:32:20.9 295 16.1 127.2 Y
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