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We report on the intense burst ``forest'' recorded on 2006 March 29 whichlasted for ~30s. More than 40 bursts were detected both by BAT and by XRT,seven of which are rare intermediate flares (IFs): several times 10^{42} ergswere released. The BAT data were used to carry out time-resolved spectroscopyin the 14-100keV range down to 8ms timescales.  This unique dataset allowed us to test the magnetar model predictions such asthe magnetically trapped fireball and the twisted magnetosphere over anunprecedented range of fluxes and with large statistics (in terms of bothphotons and IFs). We confirmed that a two blackbody component fits adequatelythe time-resolved and integrated spectra of IFs. However, Comptonization modelsgive comparable good reduced chi^2. Moreover, we found: i) a change ofbehavior, around ~10^{41} erg/s, above which the softer blackbody shows a sortof saturation while the harder one still grows to a few times 10^{41} erg/s;ii) a rather sharp correlation between temperature and radii of the blackbodies(R^2 prop kT^{-3}), which holds for the most luminous parts of the flares(approximately for L_{tot} > 10^{41} erg/s). Within the magnetar model, themajority of these findings can be accounted for in terms of thermalisedemission from the E-mode and O-mode photospheres. Interestingly, the maximumobserved luminosity coming from a region of ~15km matches the magneticEddington luminosity at the same radius, for a surface dipole field of ~8 x10^{14} G (virtually equal to the one deduced from the spindown of SGR1900+14).

A Swift gaze into the 2006 March 29th burst forest of SGR 1900+14