[AAVSO-HEN] GRB 20071013: Xinglong TNT optical Upper Limit

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TITLE:   GCN CIRCULAR
NUMBER:  6908
SUBJECT: GRB 20071013: Xinglong TNT optical Upper Limit
DATE:    07/10/13 14:11:24 GMT
FROM:    L.P. Xin at NAOC  <xlp at bao.ac.cn>

L.P. Xin, M. Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng,
J.Wang and W.K. Zheng on behalf of EAFON report:
 
We have imaged the field of GRB 071013(Marshall et al.,
GCN 6907) with the TNT 0.8m telescope at Xinglong
Observatory started from 12:14:08 UT , 289s after
the burst. A series of White and R band images were
obtained, no new source was found in our combined
images within the error region of the BAT.
The 3-sigma limit derived form USNO-B1.0 R mag is 
------------------------------------
Band  Mid time   Exp time  Limit Mag
 
White 504s       19*20s    20.0 
R     1538s      20*60s    20.2
 
Further observation is under going. 
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