[vsnet-grb-info 15881] GRB141212A: xinglong TNT upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17169
SUBJECT: GRB141212A: xinglong TNT upper limit
DATE:    14/12/12 21:58:48 GMT
FROM:    L.P. Xin at NAOC  <xlp at bao.ac.cn>

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

We began to observe GRB 141212A (Ukwatta eta l., GCN 17158)  
with Xinglong  0.8-m TNT telescope at 2014-12-12, 12:14:40(UT),
about 39 sec the burst.

In any single W-band frame or coadded image,  no any new 
optical transient was detected within XRT circle 
(Ukwatta eta l., GCN 17158; Osborne et al, GCN 17164 ) 
down to 3 sigma limit of R~20 mag at the mid-time of 4 min 
after the burst, calibrated by the nearby USNO B1.0 R2 mag.

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