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We present the results of CO(1-0) and CO(4-3) observations of the host galaxyof a long-duration gamma-ray burst GRB080207 at z = 2.0858 by using the Karl G.Jansky Very Large Array and the Atacama Large Millimeter/submillimeter Array.The host is detected in CO(1-0) and CO(4-3), becoming the first case for a GRBhost with more than two CO transitions detected combined with CO(2-1) andCO(3-2) in the literature. Adopting a metallicity-dependent CO-to-H2 conversionfactor, we derive a molecular gas mass of Mgas = 8.7 x 10^10 Modot, whichplaces the host in a sequence of normal star-forming galaxies in aMgas-star-formation rate (SFR) plane. A modified blackbody fit to thefar-infrared--millimeter photometry results in a dust temperature of 37 K and adust mass of Mdust = 1.5 x 10^8 Modot. The spatially-resolving CO(4-3)observations allow us to examine the kinematics of the host. The CO velocityfield shows a clear rotation and is reproduced by a rotation-dominated diskmodel with a rotation velocity of 350 km/s and a half-light radius of 2.4 kpc.The CO spectral line energy distribution derived from the four CO transitionsis similar to that of starburst galaxies, suggesting a high excitationcondition. Comparison of molecular gas properties between the host and normal(main-sequence) galaxies at similar redshifts shows that they share commonproperties such as gas mass fraction, gas depletion timescale, gas-to-dustratio, location in the Mgas-SFR (or surface density) relation, and kinematics,suggesting that long-duration GRBs can occur in normal star-formingenvironments at z ~ 2.

Molecular Gas Properties in the Host Galaxy of GRB080207