GCN Circular 10080
Subject
GRB 091020 : Xinglong TNT upper limit
Date
2009-10-26T12:31:47Z (15 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
L.P. Xin, X.F. Wang, J. Wang, Y.L. Qiu, J.Y. Wei,
W.K. Zheng, J.S. Deng, and C. Wu, J.Y. Hu
on behalf of EAFON report:
We observed the optical afterglow of GRB 091020
(e.g. Racusin et al., GCN 10048; Gorbovskoy et al.,
GCN 10052; Perley GCN 10060) with Xinglong TNT
telescope from Oct. 22, 20:27:52(UT),1.952 days
after the burst. The optical afterglow (Gorbovskoy
et al., GCN 10052; Perley GCN 10060) was not detected
in our combined image with a duration of 7*600 sec.
The upper limit is estimated to be R~21.4 mag
from USNO-B1.0 R2 magnitude, at the mean time of
1.974 days since the trigger.
This message may be cited.
For more information about Xinglong GRBs Follow-up
observations, please visit the web-site:
http://www.xinglong-naoc.org/grb/