[AAVSO-HEN] GRB 090709A: Xinglong TNT optical upper limit

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  9658
SUBJECT: GRB 090709A: Xinglong TNT optical upper limit
DATE:    09/07/12 03:16:43 GMT
FROM:    L.P. Xin at NAOC  <xlp at bao.ac.cn>

L.P. Xin, W.K. Zheng, Y.L. Qiu, J.Y. Wei, J. Wang, 
J.S. Deng and J.Y. Hu on behalf of EAFON report:

We have observed GRB 090709A (Morris et al.GCN 9625)
with Xinglong TNT telescope from July 9, 13:41:18 (UT),
6.04 hour after the burst. After combined 10*600s R
band images, no new source or afterglow counterpart (Morgan et al.GCN
9635;Guidorzi et al. GCN 9648) was 
found in our combined image within the XRT errorbox (Morris et al. GCN
9625). 
The uplimit is estimated to be about 20.6 mag at the mean time 
of 6.816 hours since the trigger. 

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