[AAVSO-HEN] GRB 070406: The exprosure time of Xinglong TNT optical Upper Limit

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  6252
SUBJECT: GRB 070406: The exprosure time of Xinglong TNT optical Upper Limit
DATE:    07/04/07 08:36:52 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:

I want to make a apologize that 
I have forgotten to provide you the exposure time
of the combined image in CGN 6250, 
that was 1090s .

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