Stellar mass against redshift for the sample of GRBHs from this work (pentagons), HPM14 (circles), and for GRBH 980425 (Michałowski et al. 2014, triangle) and GRBH 031203 (Symeonidis et al. 2014, square). The small grey circles correspond to a sample of non-GRBH targets observed and detected with Herschel (details in Sect. 5.2 and Figs. 6 and 7). Data points are colour-coded according to GRBH SFR. Those GRBHs detected with Herschel are plotted as filled symbols, and undetected GRBHs are shown with open symbols. GRBHs that had a GRB with A_V,GRB> 1 mag are indicated with an additional ring drawn around the data point. The dashed curve provides a rough divide between those galaxies detected and undetected with Herschel.