[vsnet-grb-info 5431] GRB 071117: Gemini Observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sun Nov 18 12:42:46 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 7105
SUBJECT: GRB 071117: Gemini Observations
DATE: 07/11/18 03:42:39 GMT
FROM: Josh Bloom at UC Berkeley <jbloom at astron.berkeley.edu>
J. S. Bloom (UC Berkeley), on behalf of the Gemini GRB collaboration,
reports:
"Imaging observations of the field of GRB 071117 (Ukwatta et al., GCN
7098) were autonomously queued for Gemini South as part of the
program GS-2007B-Q-2 (PI = H.-W. Chen). Starting at 2007 Nov 18
00h24m UT, we obtained 5 x 180 sec images in r-band. Within the
revised XRT error circle (Guidorzi et al. GCN 7103) we find one
source (s1) at position:
s1: ra= 22:20:10.63 dec = -63:26:33.7 (J2000)
The uncertainty is 350 mas in each coordinate (relative to USNO
B1.0). This source, s1, is roughly R=23.3 mag at the time of
observation (based upon the USNO B.10 catalog magnitude of the source
at 22:20:13.33 -63:26:32.9). There is another source straddling the
90% error circle, embedded in an apparent faint extension to the
southeast at:
s2: ra= 22:20:10.42 dec = -63:26:35.5 (J2000)
Further observations will be required to determine if either of these
sources are variable."
A finder may be obtained at:
http://lyra.berkeley.edu/~jbloom/grb071117-gemini-ep1.ps.gz
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