1140005

The goal of this proposal is to perform a thorough investigation with the instruments onboard INTEGRAL of the broad band hard X-ray properties of the Bursting Pulsar GRO J1744-28 in case it will undergo an outburst during AO11. We ask to visit the source three times separated one another by about one month for a totaloverall time of 280 ks. In particular we intend to search for cyclotron absorption lines in the X-ray spectrum ofthis object in order to get a direct measurement of the accreting neutron star magnetic field intensity. We alsopropose to: (i) monitor the spectral and timing behaviours of the hard emission from the outburst onset to the decay toward quiescence (ii) to obtain phase-resolved spectra of the pulsating X-ray emission and (iii) to pinpoint the differences between the bursting and the persistent fluxes of this source. Other r^ant issues which can be explored with INTEGRAL observations such as the determination of a pulse period derivative Pdot and the comparison with the other peculiar source MXB 1730-335 (the Rapid Burster) are discussed.This is the resubmission of the proposal on GRO J1744-28 approved since INTEGRAL-AO1 [truncated! Please see actual data for full text]