  We present results of ASCA deep exposure observations of the hardest X-ray
source discovered in the ASCA Large Sky Survey (LSS) project, designated as AX
J131501+3141. We extract its accurate X-ray spectrum, taking account of the
contamination from a nearby soft source (AX J131502+3142), separated only by
1'. AX J131501+3141 exhibits a large absorption of NH = (6 +4 -2)x 10^22 H/cm^2
with a photon index \Gamma = 1.5 +0.7 -0.6. The 2--10 keV flux was about 5 x
10^-13 erg/s/cm^2 and was time variable by a factor of 30% in 0.5 year. From
the highly absorbed X-ray spectrum and the time variability, as well as the
results of the optical follow-up observations (Akiyama et al. 1998,
astro-ph/9801173), we conclude that AX J131501+3141 is a type 2 Seyfert galaxy.
Discovery of such a low flux and highly absorbed X-ray source could have a
significant impact on the origin of the cosmic X-ray background.
