Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 22804

Subject
GRB 180618A: Xinglong-2.16m optical upper limit
Date
2018-06-20T13:02:02Z (6 years ago)
From
Dong Xu at NAOC/CAS <dxu@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.
Looking for U.S. government information and services? Visit USA.gov