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BESIII is a multipurpose spectrometer optimized for physics in the tau-charmenergy region. Both detector and accelerator are undergoing an upgrade program,that will allow BESIII to run until 2029. A major upgrade is the replacement ofthe inner drift chamber with a new detector based on Cylindrical Gas ElectronMultipliers to improve both the secondary vertex reconstruction and theradiation tolerance. The CGEM-IT will be composed of three coaxial layers ofcylindrical triple GEMs, operating in an Ar$\,$+$\,$iC$_4$H$_{10}$ (90:10) gasmixture with field and gain optimized to maximize the spatial resolution. Thenew detector is readout with innovative TIGER electronics produced in 110$\,$nmCMOS technology. The front end is a custom designed 64$\,$channel ASICfeaturing a fully digital output and operated in trigger-less mode. It canprovide analog charge and time measurements with a TDC time resolution betterthan 100$\,$ps, that will allow to operate in $\mu$TPC mode. Before theinstallation inside BESIII, foreseen in 2021, a long standalone data taking isongoing at the Institute of High Energy Physics in Beijing; currently, thefirst two cylindrical chambers are available for the test, and are used tocomplete the integration between the detector and the electronics and to assessthe required performance. In this proceeding a description of the CGEM-ITproject, the TIGER features and performance, and the results of the analysis offirst cosmic ray data taking will be presented. Focus will be given on thestrip analysis, from which it is possible to measure the basic properties ofthe detector, and the cluster analysis. The first preliminary results onefficiency and spatial resolution will be also presented.

Preliminary results from the cosmic data taking of the BESIII cylindrical GEM detectors