[vsnet-grb-info 1740] GRB 050713A: ROTSE-III Optical Limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Jul 13 14:18:37 JST 2005
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 3580
SUBJECT: GRB 050713A: ROTSE-III Optical Limits
DATE: 05/07/13 05:16:29 GMT
FROM: Sarah Yost at U.Michigan <sayost at umich.edu>
S.A. Yost, E.S. Rykoff, W. Rujopakarn (U Mich), K. Alatalo (Berkeley), B.
Schaefer (Louisiana State) report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
050713A (Swift trigger 145675), producing images beginning 10.7 s
after the GCN notice time. An automated response took the first image
at 04:29:24.8 UT, 22.4 s after the burst, under fair conditions. We
took 10 5-sec, 10 20-sec and 10 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 or at the XRT position, for both single images
and coadding into sets of 10. Individual images have limiting
magnitudes ranging from 16.2-17.7; we set the following limit, noting
it is adversely affected by the glare from the nearby bright star SAO
10034 (V=6.6), 67" from the XRT position.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
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04:29:24.8 4:30:46.8 82 17.7 22.4 Y
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