[vsnet-grb-info 20706] GRB 180618A: Xinglong-2.16m optical upper limit
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Jun 20 22:02:55 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 22804
SUBJECT: GRB 180618A: Xinglong-2.16m optical upper limit
DATE: 18/06/20 13:02:02 GMT
FROM: Dong Xu at NAOC/CAS <dxu at nao.cas.cn>
Z.P. Zhu, D. Xu, J.B. Zhang (NAOC), X. Zhang, J.H. Liu (XAO), Z.B. Dai
(YNAO) report:
We observed the field of GRB 180618A (LaPorte et al., GCN 22790) using
the 2.16-m telescope located at Xinglong, Hebei, China, equipped with
the BFOSC camera. We obtained 6x600s R-band frames, starting at 12:43:22
UT on 2018-06-19, i.e., 1.50 days after the BAT trigger.
The previously detected optical afterglow of the GRB (e.g., LaPorte et
al., GCN 22790; Guidorzi et al., GCN 22792; Tyurina et al., GCN 22797)
was not present in our stacked image, down to a limiting magnitude of
R~21.4 mag, calibrated with the SDSS field.
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