Dark gamma ray bursts have puzzled astronomers for over a decade. The energetic gamma ray events, known as Gamma Ray Bursts (GRBs), all have an afterglow visible in the X-ray part of the spectrum, yet only half were visible at optical wavelengths. The half that were not visible in optical light, known as dark gamma ray bursts seemed to indicate that there may be a new class of GRBs not previously understood. Louise Ogden spoke to Dr Patricia Schady of the Max Planck Institute in Munich, whose team has found that dark gamma ray bursts are not in fact all that exotic...