Herschel/PACS 100μm images of GRBH 000210, GRBH 081109 and GRBH 090926B (first three panels), and Herschel/SPIRE 250μm image of GRBH 000418 (furthest right). The PACS and SPIRE images are 2′×2′ and 4′×4′, respectively, centred on the GRB afterglow position (red cross), and have been smoothed using a Gaussian with σ two times the pixel scale. The images are 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.