Observations of the X-ray burster-pulsar GRO J1744-28 with the TTM telescope onboard the "MIR-KVANT" space observatory

Discovered on Dec. 1995 transient burster-pulsar GRO J1744-28 is one of the most interesting sources for X-ray astrophysics. Results of the source observations by TTM device of "KVANT" module onboard the "MIR" space station are discussed. The light curves for the five strong outbursts of the source are presented. The X-ray source localization by the TTM telescope is adduced with accuracy of 1 arcmin. It was demostrated that outbursts position coincides with the GRO J1744-28 position. Object energy spectra for the range from 2 to 27 keV during the outbursts and between them are obtained. Spectral shape is fitted well by power-law with an exponential cut-off fit typical for x-ray pulsars. According to our observations spectral shape during outbursts is the same while intensity is 3-8 times higher.