[vsnet-grb-info 4478] GRB 070406: Xinglong TNT optical Upper Limit
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Apr 7 09:38:17 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6250
SUBJECT: GRB 070406: Xinglong TNT optical Upper Limit
DATE: 07/04/07 00:38:13 GMT
FROM: L.P. Xin at NAOC <xlp at bao.ac.cn>
W.K. Zheng, M.Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng,
Y. Urata, J.Z. Li and L.P. Xin on behalf of EAFON report:
We have imaged the field of GRB 070406 with the
TNT 0.8m telescope at Xinglong Observatory started
from 20:42:33 UT on Apil. 6, about 19.86 hours after the burst.
seven white band images were obtained,
and no new source was found in our Totally combined image
within the error region of BAT of the Swift.
the 3-sigma limit is ~19.8 derieved form USNO A-2.0.
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