[vsnet-grb-info 8646] GRB 091109b: Magellan Observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Tue Nov 10 14:28:33 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 10153
SUBJECT: GRB 091109b: Magellan Observations
DATE: 09/11/10 05:28:28 GMT
FROM: Edo Berger at Harvard <eberger at cfa.harvard.edu>
E. Berger (Harvard), K. Covey (Cornell), A. A. West, J. M. Andersen
(BU), and M. McDonald (U. Maryland, College Park) report:
"We observed the XRT error circle (GCN #10151) of the short GRB 091109b
(GCN #10152) with IMACS on the Magellan/Baade 6.5-m telescope starting
on 2009 Nov. 10.167 UT (6.2 hours after the burst). In a 1200-sec
stacked R-band image we find no optical sources within the XRT error
circle to a 3-sigma limit of R~23 mag in comparison to several nearby
stars in the USNO-B catalog. We further note that the object claimed to
be a galaxy north-west of the XRT position (GCN #10150) appears to be
resolved into two point sources in our image (with a seeing of about
1.1 arcsec)."
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