GCN Circular 12467
Subject
GRB 111020A: Gemini-South i-band observations
Date
2011-10-21T01:58:38Z (13 years ago)
From
Wen-fai Fong at CFA <wfong@cfa.harvard.edu>
W. Fong (Harvard), E. Berger (Harvard) and D. Fox (PSU) report:
We imaged the location of the short GRB 111020A (GCN 12460) with GMOS on the
Gemini-South 8-m telescope on 2011 October 21.01 UT (mid-time of 17.7 hours
post-burst). We obtained 9x180s exposures in i-band with 0.8" seeing.
We find no sources within the enhanced XRT error circle (GCN 12463) to a
3-sigma limiting magnitude of i~25 mag.
However, we find two faint objects just outside of the XRT error circle with
coordinates (J2000):
S1:
RA = 19:08:12.501
Dec = -38:00:41.80
S2:
RA = 19:08:12.698
Dec = -38:00:44.46
S1 has a brightness of i~23.7 mag and appears to be point-like. S2 is
fainter, at the threshold of detectability with a brightness of i~25 mag.
The nearest galaxy is located at:
G1:
RA = 19:08:12.231
Dec = -38:00:48.80
with a magnitude of i~23.3 mag, and 6.2" from the center of the XRT error
circle.