Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 15617

GRB 131227A: OT candidate from KAIT Optical observations
2013-12-27T07:06:02Z (10 years ago)
Weikang Zheng at UC Berkeley <>
WeiKang Zheng, Alexei V. Filippenko, Adam Morgan (UC Berkeley), and
S. B. Cenko (NASA/Goddard Space Flight Center) report on behalf of the
KAIT GRB team:

The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at
Lick Observatory, responded to GRB 131227A (Oates et al., GCN 15616)
starting at 04:47:49 UT, 178 s after the burst. Observations were
performed with an automatic sequence in the V, I, and clear(roughly R)
filters, and the exposure time was 20 s per image.
Within the XRT error circle, we detected a new faint source at
coordinate of (J2000):

Ra =  04:29:30.83,   Dec= +28:52:58.81 (uncertainty about 1")

The object faded from mag ~18.6 to be below than 20.0 in our clear
band image about 10 minutes after (calibrated to USNO B1.0). We
suggest this is the OT of GRB 131227A. Further observations are
Looking for U.S. government information and services? Visit