TITLE:   GCN CIRCULAR
NUMBER:  13960
SUBJECT: GRB 121108A: Xinglong TNT upper limit
DATE:    12/11/09 12:22:18 GMT
FROM:    L.P. Xin at NAOC  <xlp@bao.ac.cn>

L. P. Xin,  Y. L. Qiu,  J. Y. Wei,  J. Wang,  J. S. Deng, 
C. Wu,  X. H. Han on behalf of EAFON report:

We began to observe GRB121108A ( Ukwatta  et al., GCN 13952 ) 
with Xinglong TNT telescope at  17:49:47 (UT), about 128s after 
the burst.  A series of white and R-band images were obtained. 
No any optical counterpart was found in the X-ray errorbox 
(Beardmore et al., GCN 13959).  The 3 sigma upper limit is about 19.9 
mag in R-band calibrated by USNO B1.0 R2 mag,  at the mean 
time of 58 min after the burst. 

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