  At the 33rd ICRC, we reported the possible detection of solar gamma rays by a
ground level detector and later re-examined this event. On March 7, 2011, the
solar neutron telescope (SNT) located at Mt. Sierra Negra, Mexico (4,600 m)
observed enhancements of the counting rate from 19:49 to 20:02 UT and from
20:50 to 21:01 UT. The statistical significance was 9.7sigma and 8.5sigma,
respectively. This paper discusses the possibility of using this mountain
detector to detect solar gamma rays. In association with this event, the solar
neutron detector SEDA-FIB onboard the International Space Station has also
detected solar neutrons with a statistical significance of 7.5sigma. The
FERMI-LAT detector also observed high-energy gamma rays from this flare with a
statistical significance of 6.7sigma. We thus attempted to make a unified model
to explain this data. In this paper, we report on another candidate for solar
gamma rays detected on September 25th, 2011 by the SNT located in Tibet (4,300
m) from 04:37 to 04:47 UT with a statistical significance of 8.0sigma (by the
Li-Ma method).
