Discovery of two new X-ray burst sources XB 1812-12 in Serpens and XB1940-04 in Aquila.

Two new X-ray burst sources, XB1812-12 and XB1940-04, have been discovered in Serpens and in Aquila region, respectively, from Hakucho observations. The location of XB1812-12 coincides with that of 4U1812-12/3A1812-121 which was once reported as the transient X-ray source Ser X-2 in 1965. In the error box of XB1940-04, there is no reported or cataloged X-ray source. Including XB1812-12, eight out of 27 X-ray burst sources have been ientified with transient X-ray sources. The higher energy band from XB1812-12 exhibits a double-peaked profile.