[vsnet-grb-info 7532] GRB 090404: Xinglong TNT optical Upper Limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9090
SUBJECT: GRB 090404: Xinglong TNT optical Upper Limit
DATE:    09/04/04 23:49:27 GMT
FROM:    L.P. Xin at NAOC  <xlp at 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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