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Aims: WISE provides an infrared all-sky survey which aims at completing ourknowledge on the possibly dramatically increasing number of brown dwarfs withlower temperatures. We search for the nearest representatives of the coolestbrown dwarfs, which will be very interesting for detailed follow-upobservations, once they haven been discovered. Methods: We have used thepreliminary data release from WISE, selected bright candidates with colourstypical of late-T dwarfs, tried to match them with faint 2MASS and SDSSobjects, to determine their proper motions, and to follow-up themspectroscopically. Results: We have identified two new ultracool brown dwarfs,WISE J0254+0223 and WISE J1741+2553, with large proper motions of about 2.5 and1.5 arcsec/yr, respectively. With their w1-w2~3.0 and J-w2~4.0 colour indiceswe expect both to have a spectral type of ~T8-T10 and absolute magnitude ofM_{w2}~14. We confirm WISE J1741+2553 as a T9-T10 dwarf from near-infraredspectroscopy with LBT/LUCIFER1. From their bright WISE w2 magnitudes of 12.7and 12.3, we estimate distances of 5.5$^{+2.3}_{-1.6}$ pc and4.6$^{+1.2}_{-1.0}$ pc and tangential velocities of ~65 km/s and ~34 km/sindicating Galactic thick and thin disk membership, respectively.

Two very nearby (d ~ 5 pc) ultracool brown dwarfs detected by their large proper motions from WISE, 2MASS, and SDSS data