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GCN Circular 16154

GRB 140423A: Nanshan optical upper limit
2014-04-23T17:26:52Z (10 years ago)
Dong Xu at DARK/NBI <>
D. Xu (DARK/NBI), X. Zhang, C.-H. Bai, A. Esamdin, L. Ma (XAO) report:

We observed the optical afterglow field of GRB 140423A (Sonbas et al.,
GCN 16142; Elenin et al., GCN 16143; Kaur et al., GCN 16144;) using
the 1m telescope located at Nanshan, Xinjiang, China. Three R-band
frames were obtained under rather bad weather. The afterglow has
decayed down to a limiting magnitude of m(R)>19.4 mag at a mean time
of 8.216 hr post-burst, calibrated with nearby SDSS stars.
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