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GCN Circular 9114

GRB 090408: Xinglong TNT optical Upper Limit
2009-04-09T05:06:27Z (15 years ago)
L.P. Xin at NAOC <>
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 GRB 090408 (Stroh et al., GCN 9110)
with Xinglong TNT telescope from  Apr.8,16:27:30 (UT),
1.42 hour after the burst. After combined 18*300s R
band images, no new source was found in our combined
image. The 3 sigma upper limits derived from  USNO-B1.0 
R2 magnitude is R=21.1 mag at the mean time of 1.67 hour
since the trigger.

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