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Long-duration gamma-ray bursts are associated with the explosions of massivestars and are accordingly expected to reside in star-forming regions withmolecular gas (the fuel for star formation). Previous searches for carbonmonoxide (CO), a tracer of molecular gas, in burst host galaxies did not detectany emission. Molecules have been detected as absorption in the spectra ofgamma-ray burst afterglows, and the molecular gas is similar to the translucentor diffuse molecular clouds of the Milky Way. Absorption lines probe theinterstellar medium only along the line of sight, so it is not clear whetherthe molecular gas represents the general properties of the regions where thebursts occur. Here we report spatially resolved observations of CO lineemission and millimetre-wavelength continuum emission in two galaxies hostinggamma-ray bursts. The bursts happened in regions rich in dust, but notparticularly rich in molecular gas. The ratio of molecular gas to dust (<9-14)is significantly lower than in star-forming regions of the Milky Way and nearbystar-forming galaxies, suggesting that much of the dense gas where stars formhas been dissipated by other massive stars.

Two gamma-ray bursts from dusty regions with little molecular gas