[vsnet-grb-info 15032] GRB 140523A: Nanshan optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16326
SUBJECT: GRB 140523A: Nanshan optical upper limit
DATE:    14/05/24 15:43:48 GMT
FROM:    Dong Xu at DARK/NBI  <dong.dark at gmail.com>

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

We observed the field of the possible XRT afterglow (D'Elia et al.,
GCN 16324) of GRB 140523A (von Kienlin et al., GCN 16321; Vianello et
al., GCN 16322) using the 1m telescope located at Nanshan, Xinjiang,
China. Observations started at 15:06:12 UT on 2014-05-24 (i.e., 36.0
hr after the burst), and 2x180s and 2x600s R-band frames were
obtained.

No optical source is detected at the XRT position down to a limiting
magnitude of R=20.5, calibrated with the SDSS field.