[vsnet-grb-info 14967] GRB 140512A: Xinglong TNT optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16261
SUBJECT: GRB 140512A:  Xinglong TNT optical observation
DATE:    14/05/13 16:25:20 GMT
FROM:    L.P. Xin at NAOC  <xlp at bao.ac.cn>

L. P. Xin,   X. F. Wang,  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 140512A (Pagani et al., GCN 16429)  with Xinglong 
0.8-m TNT telescope at 19:33:54  (UT) , 126 sec after the burst.

The optical counterpart (Pagani et al., GCN 16429) was clearly detected
 in our white and R band images.  A preliminary analysis shows that 
the brightness of the OT was fading from 13.0 mag to 17.0 mag, 
calibrated by nearby USNO B1.0 R2mag, during our observation epoch,  
with an index of  1.54  after fitting by a single power law.

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