[AAVSO-HEN] GRB 070406: Xinglong TNT optical Upper Limit

[grb at aavso.org]

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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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