Herschel/PACS 100μm and 160μm images of GRBH 070306. The images are 2′×2′and 3′×3′, respectively, centred on the GRB afterglow position (red cross), and have been smoothed using a Gaussian with σ two times the pixel scale. The image is displayed with a linear greyscale ranging from − 1 mJy pix^-1 (black) to + 1 mJy pix^-1 (white), and contour levels from 1σ to 6σ are over plotted in back. The spatial scale is indicated on the top left.