Left: HGPS significance map of HESS J1843−033 (obtained with a correlation radius of 0.1°). The dashed and solid yellow circles indicate the Gaussian σ extent and the R_spec. The dashed black circles represent the two Gaussian components previously detected by the HGPS pipeline, which were finally merged into HESS J1843−033. The H.E.S.S. contours from 3σ to 9σ appear in cyan. Right: same as in the left panel; the SNR candidates found in the THOR radio survey (Anderson et al. 2017) are shown as green circles and the synchrotron-emitting SNR G28.6−0.1 and the energetic pulsar PSR J1844−0346 are shown in white. The inset shows the 99 ks-long Chandra map of G28.6−0.1.