TITLE:   GCN CIRCULAR
NUMBER:  10583
SUBJECT: GRB 100413: xinglong TNT optical upper limit
DATE:    10/04/13 19:49:41 GMT
FROM:    L.P. Xin at NAOC  <xlp@bao.ac.cn>

L.P. Xin, H. Liu, Y.L. Qiu, J.Y. Wei,J. Wang, J.S. Deng, 
C. Wu, J.Y. Hu, W.K. Zheng on behalf of EAFON report:

We began to observe GRB100413 (Holland et al., GCN 10581, Ivanov et al.
GCN 10582) with Xinglong TNT telescope at 17:44:03(UT),10min 35s after
the burst. A series of white, R band images were obtained. No new source
(Ivanov et al. GCN 10582) is found in the XRT errorbars within the
combined 20*20s white band data. The 3 sigma upper limit is about 20.6
mag  derived from USNO-B1.0,at the mean time of 13 min after the burst.


Further observations are encouraging. 

This message may be cited.

For more information about Xinglong GRBs Follow-up
observations, please visit the website:
http://www.xinglong-naoc.org/grb/