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Star-forming galaxies populate a main sequence (MS), a well-defined relationbetween stellar mass (M*) and star-formation rate (SFR). Starburst (SB)galaxies lie significantly above the relation whereas quenched galaxies liebelow the sequence. In order to study the evolution of galaxies on the SFR-M*plane and its connection to the gas content, we use the fact that recentepisodes of star formation can be pinpointed by the existence of gamma-raybursts (GRBs). Here we present sensitive [CI]-nondetections of z$\sim$2 ultraluminous infrared (ULIRG) GRB host galaxies. We find that our GRB hosts havesimilar molecular masses to those of other ULIRGs. However, unlike otherULIRGs, the GRB hosts are located at the MS or only a factor of a few above it.Hence, our GRB hosts are caught in the transition toward the SB phase. This isfurther supported by the estimated depletion times, which are similar to thoseof other transitioning galaxies. The GRB hosts are [CI]-dark galaxies, definedas having a [CI]/CO temperature brightness ratio of <0.1. Such a low [CI]/COratio has been found in high-density environments (nH > 10$^4$ cm$^{-3}$) whereCO is shielded from photodissociation, leading to under-abundances of [CI].This is consistent with the merger process that is indeed suggested for our GRBhosts by their morphologies.

Main Sequence to Starburst Transitioning Galaxies: Gamma-ray Burst Hosts at $z\sim2$