LIGO/Virgo G268556: GWAC_F60B (60cm) follow-up two events of EWE001 and EWE002

We took images on the location of two events of EWE001 and EWE002 (Liu et al LVC Circ. 20382) with our GWAC_F60B (60cm) telescope, which is dedicated to identify transient candidates found by GWAC (a part of ground instrument of SVOM mission) at Xinglong Observatory, China. Observation were obtained in R band for 15 X 900s expoures during 16:49:29 and 22:02:03 (UTC) on Juanary 8, 2017. The two events(objects) are corresponding to known objects in USNO-B1.0 catalog. ----------------------------------------------------------------------- EWE001: mag_R = 16.98 mag_R2(in USNO) = 15.35 EWE002: mag_R=16.77 mag_R2(in USNO) = 16.57 ------------------------------------------------------------------------ The photometric uncertainty is ~ 5%. The comparison star is object with mag_R2 =16.17 (09:13:19.611 61:05:44.13 J2000).