  An electron antineutrino mass has been measured in tritium beta-decay in the
"Troitsk nu-mass" experiment. The setup consists of a windowless gaseous
tritium source and an electrostatic electron spectrometer. The whole data set
acquired from 1994 to 2004 was reanalysed. A thorough selection of data with
the reliable experimental conditions has been performed. We checked every known
systematic effect and got the following experimental estimate for neutrino mass
squared m_{nu}^{2}=-0.67+/- 2.53 {eV}^{2}. This gives an experimental upper
sensitivity limit of m_{nu}<2.2 eV and upper limit estimates m_{nu}<2.12 eV,
95% C.L. for Bayesian statistics and m_{nu}<2.05 eV, 95% C.L. for the Feldman
and Cousins approach.
