TITLE:   GCN CIRCULAR
NUMBER:  15376
SUBJECT: GRB 131024B: Nanshan optical upper limit
DATE:    13/10/25 03:26:23 GMT
FROM:    Dong Xu at DARK/NBI  <dong.dark@gmail.com>

D. Xu (DARK/NBI), X. Zhang, C-H. Bai, A. Esamdin, L. Ma (XAO) report:

We observed the field of GRB 131024B (Krimm et al., GCN 15371) using the 1m
telescope located on Mt. Nanshan, Xinjiang, China. We obtained 4x300s
R-band frames at a mean time of  2013-10-24 23:21:53 UT, i.e., 1.773 hr
after the BAT trigger.

No optical source is detected within the XRT error circle in the stacked
image down to a limiting magnitude of R=21.0, calibrated with nearby SDSS
field.