W28 field: HESS J1801-233/J1800-240

[References]

H.E.S.S.: G.Rowell et al., 30th ICRC (2007) / arXiv:0710.4057 [astro-ph] p.18
            F. Aharonian et al., Astron. Astrophys. 481, 401-410 (2008)