[vsnet-grb-info 7523] GRB 090401B: Xinglong TNT optical Upper Limit
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Fri Apr 3 18:17:39 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 9082
SUBJECT: GRB 090401B: Xinglong TNT optical Upper Limit
DATE: 09/04/03 09:17:29 GMT
FROM: L.P. Xin at NAOC <xlp at bao.ac.cn>
S.M. Hu, L.P. Xin, W.K. Zheng, Y.L. Qiu, J.Y. Wei,
j. Wang, J.S. Deng and J.Y. Hu on behalf of EAFON report:
We have observed GRB 090401B (Schady et al., GCN
9066; Schady & Oates, GCN 9067, GCN 9074)
with Xinglong TNT telescope from Apr.1, 11:25:22(UT),
3.37 hr after the burst. After combined 9*300s R
band images, no new source was found in our combined
image. The 3 sigma upper limits was obtained
to be R=19.9 mag at the mean time of 2.71 hr after
the trigger, with the calibration to USNO-B1.0 R2 magnitude.
This message may be cited.
For more information about Xinglong GRBs Follow-up
observations, please visit the website:
http://www.xinglong-naoc.org/grb/
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