90 cm VLA radio flux density map (LaRosa et al. 2000) of the innermost 20 pc of the GC, showing emission from the SNR Sgr A East. Black contours denote radio flux levels of 2, 4 and 6 Jy beam−1. The centre of the SNR (Green 2009) is marked by the white square, and the positions of Sgr A* (Reid et al. 1999) and G359.95−0.04 (head position, Wang et al. 2006) are given by the cross hairs and the black triangle, respectively. The 68 per cent CL total error contour of the best-fitting centroid position of HESS J1745−290 is given by the white circle. The dashed white circle shows the same contour for the previously reported H.E.S.S. measurement (Aharonian et al. 2006b). The white and black dashed–dotted lines show the 95 per cent CL upper limit contour of the source extension and the 68 per cent containment region of the H.E.S.S. PSF, respectively. The white stars marked A and B denote the position of the radio maximum and the best-fitting position for the radio emission after smoothing with the PSF of the H.E.S.S. instrument, respectively.
