[vsnet-grb-info 13800] GRB 130822A: Weihai optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15114
SUBJECT: GRB 130822A: Weihai optical upper limit
DATE:    13/08/22 18:32:54 GMT
FROM:    Dong Xu at DARK/NBI  <dong.dark at gmail.com>

D. Xu (DARK/NBI), D.-Y. Ren, C. Cao, S.-M. Hu (SDU) report:

We observed the field of GRB 130822A (Kocevski et al., GCN 15112)
using the 1m telescope located in Weihai, Shandong, China.
Observations started at 17:05:49 UT on 2013-08-22 (i.e., 1.19 hr after
the BAT trigger) and 3x500s SDSS r'-band frames were obtained in a
cloudy weather.

No optical source is detected within the XRT error circle (Kocevski et
al., GCN 15112) in the stacked image down to r'>~20 mag, calibrated
with SDSS field.