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GCN Circular 16326

GRB 140523A: Nanshan optical upper limit
2014-05-24T15:43:48Z (10 years ago)
Dong Xu at DARK/NBI <>
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

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