GCN Circular 9090
Subject
GRB 090404: Xinglong TNT optical Upper Limit
Date
2009-04-04T23:49:27Z (15 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
GRB 090404: Xinglong TNT optical Upper Limit
L.P. Xin, W.K. Zheng, Y.L. Qiu, J.Y. Wei,
j. Wang, J.S. Deng, Y. Urata and J.Y. Hu
on behalf of EAFON report:
We have observed GRB090404 (Ziaeepour et al.,
GCN 9086; Beardmore et al., GCN 9088)
with Xinglong TNT telescope from Apr.4,15:58:17 (UT),
107 sec after the burst. After combined 18*20s white
band images, no new source was found in our combined
image. The 3 sigma upper limits calibrated to USNO-B1.0
R2 magnitude is R=20.37 mag at the mean time of 333 sec
after the trigger.
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For more information about Xinglong GRBs Follow-up
observations, please visit the website:
http://www.xinglong-naoc.org/grb/