X.M. Meng, Y.N. Zhu, L.P. Xin, Q.C. Feng, M. Zhai,
Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng, J. Wang,
Y. Urata and W.K. Zheng on behalf of EAFON report:
We observed GRB080603A (Paizis et al., GCN 7790), with
Xinglong 2.16m telescope + BFOSC on Jun 4, 1.321 Days
after the burst. We marginally detected the OT (Gomboc et al.,
GCN 7788; Chornock et al., GCN 7789; Kuin et al., GCN 7804
Kann et al. GCN 7822) at 3 sigma level. With the same
calibration star as used in GCN 7822 (Kann et al.) USNOB1.0
1527-0313986 at RA = 18:37:55.186, Dec. +62:45:32.28
R1 = 16.74, we estimated the OT brightness was R ~ 21.3
+/- 0.3. We also detected the faint star at east side of OT
noted by Kann et al.
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