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We present an overview of the first data release (DR1) and first-look sciencefrom the Green Bank Ammonia Survey (GAS). GAS is a Large Program at the GreenBank Telescope to map all Gould Belt star-forming regions with $A_V \gtrsim 7$mag visible from the northern hemisphere in emission from NH$_3$ and other keymolecular tracers. This first release includes the data for four regions inGould Belt clouds: B18 in Taurus, NGC 1333 in Perseus, L1688 in Ophiuchus, andOrion A North in Orion. We compare the NH$_3$ emission to dust continuumemission from Herschel, and find that the two tracers correspond closely.NH$_3$ is present in over 60\% of lines-of-sight with $A_V \gtrsim 7$ mag inthree of the four DR1 regions, in agreement with expectations from previousobservations. The sole exception is B18, where NH$_3$ is detected toward ~ 40\%of lines-of-sight with $A_V \gtrsim 7$ mag. Moreover, we find that the NH$_3$emission is generally extended beyond the typical 0.1 pc length scales of densecores. We produce maps of the gas kinematics, temperature, and NH$_3$ columndensities through forward modeling of the hyperfine structure of the NH$_3$(1,1) and (2,2) lines. We show that the NH$_3$ velocity dispersion,${\sigma}_v$, and gas kinetic temperature, $T_K$, vary systematically betweenthe regions included in this release, with an increase in both the mean valueand spread of ${\sigma}_v$ and $T_K$ with increasing star formation activity.The data presented in this paper are publicly available.

The Green Bank Ammonia Survey (GAS): First Results of NH3 mapping the Gould Belt