TS map of the entire W28 region at 10–200 GeV, with right ascension/declination as x/y axis. The radio boundary of SNR W28 is marked as a white dashed circle. The H.E.S.S. morphology contour is presented as green lines (4, 5, and 6σ), and the TeV sources HESS J1801–233 (W28-North) and HESS J1800–240 A, B, and C (A, B, and C) are indicated in green as well. The 3FGL catalog sources are marked as a cyan circle and crosses. The newly discovered GeV sources, Source-W and the southern blob, are marked as green boxes and cross. Source-W was first discovered by Hanabata et al. (2014), and its position reported by Hanabata et al. (2014) is marked as a solid green box with the label “HKJ2014.” More details about Source-W and the southern blob can be found in Figures 2  and 3 and in the text.