[vsnet-grb-info 2139] GRB 050915: ROTSE-III optical limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Sep 15 21:12:02 JST 2005
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 3978
SUBJECT: GRB 050915: ROTSE-III optical limits
DATE: 05/09/15 12:09:48 GMT
FROM: Sarah Yost at U.Michigan <sayost at umich.edu>
S.A. Yost, E.S. Rykoff (U Mich), B. Schaefer (Louisiana State), D.A.
Smith (Guilford), T. Guver (U. Istanbul) report on behalf of the ROTSE
collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
050915 (Swift trigger 155242), producing images beginning 7.5 s after
the GCN notice time. An automated response took the first image at
11:23:10.5 UT, 28.2 s after the burst, under fair conditions. We took
10 5-sec, 10 20-sec and 20 60-sec eposures. These unfiltered images are
calibrated relative to USNO A2.0 (R). With the arrival of morning
twilight, few further images are expected.
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 16.0-17.4;
we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
11:23:10.5 11:24:32.5 82 17.4 28.2 Y
11:24:33.4 11:29:34.4 301 18.0 111.1 Y
More information about the vsnet-grb-info
mailing list