[vsnet-grb-info 17166] GRB 151027A : Xinglong TNT optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18515
SUBJECT: GRB 151027A :  Xinglong TNT optical observation
DATE:    15/10/28 14:37:57 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  observed  GRB 151027A (Maselli et al., GCN 18478)  
with Xinglong  0.8-m TNT telescope at 2015-10-27 and 2015-10-28.
 
The optical afterglow (Maselli et al., GCN 18478;  Zheng & Filippenko 
GCN 18479; Elenin et al., GCN 18480;  Perley & Cenko GCN 18481; Xu et al, 18485; 
Zhang et al., GCN 18513) was clearly detected in our multi-band images.
The brightness of the optical afterglow is decayed for about 2.5 mag in R-band 
during our observations as shown in follows:
==============================
Date             Time(UT)       filter  mag   merr            
2015-10-27  11:21:59          R       16.2    0.1
2015-10-28  11:04:00          R       18.7    0.1
==============================
Calibrated by the USNO B1.0 R2 mag

More observations are encouraged. 

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