We present a type–I outburst of the high-mass X–ray binary EXO 2030+375 , detected during INTEGRAL ’ s Performance and Verification phase in December 2002 ( on–source time about 10 ^ { 6 } seconds ) .
In addition , six more outbursts have been observed during INTEGRAL ’ s Galactic Plane Scans .
X-ray pulsations have been detected with a pulse period of 41.691798 \pm 0.000016 s. The X-ray luminosity in the 5–300 keV energy range was 9.7 \times 10 ^ { 36 } erg s ^ { -1 } , for a distance of 7.1 kpc .
Two unusual features were found in the light curve , with an initial peak before the main outburst and another possible spike after the maximum . RXTE observations confirm only the existence of the initial spike .
Although the initial peak appears to be a recurrent feature , the physical mechanisms producing it and the possible second spike are unknown .
Moreover , a four-day delay between periastron passage and the peak of the outburst is observed .
We present for the first time a 5–300 keV broad-band spectrum of this source .
It can be modelled by the sum of a disk black body ( kT _ { BB } \sim 8 keV ) with either a power law model with \Gamma =2.04 \pm 0.11 keV or a Comptonized component ( spherical geometry , kT _ { e } =30 keV , \tau =2.64 , kT _ { W } =1.5 keV ) .