[vsnet-grb-info 14308] GRB 131227A: Xinglong optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15622
SUBJECT: GRB 131227A: Xinglong optical observations
DATE:    13/12/27 16:02:49 GMT
FROM:    Dong Xu at DARK/NBI  <dong.dark at gmail.com>

D. Xu (DARK/NBI), T.-M. Zhang, L.-P. Xin, F. Xiao (NAOC) report:

We observed the field of GRB 131227A (Oates et al., GCN 15616) using
the 2.16m Xinglong telescope, equipped with BFOSC and located in
Heibei, China. We obtained 2x600s R-band images with a mean time of
9.086 hr after the BAT trigger.

At the afterglow position (Zheng et al., GCN 15617), which is within
the XRT error circle (Evans & Goad, GCN 15618), the afterglow has
decayed to have R>21.2 mag, calibrated with nearby USNO B1 field.