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INTEGRAL hard X-ray observation of V0332+53

ATel #372; M. Turler (ISDC, Geneva Observatory), G. Di Cocco (IASF/CNR, Bologna), R. Diehl (MPE, Garching), S. Maisala (University of Helsinki), M. Mas-Hesse (LAEFF, Madrid), N. Mowlavi (ISDC, Geneva Observatory), A. Orr (ESTEC, Noordwijk), J. Paul (CEN, Saclay), R. A. Sunyaev (IKI, Moscow & MPA, Garching)
on 28 Dec 2004; 16:55 UT
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)

Subjects: X-ray, Gamma Ray, Binary, Neutron Star, Transient, Pulsar

Referred to by ATel #: 381, 382

The steadily brightening pulsar V0332+53 (Remillard et al. 2004 ATEL #371) was in the INTEGRAL field of view (FoV) for 2.2 ksec during a routine Galactic Plane Scan observation starting on Dec. 26, 2004 at 12:48:30 UT. The source was located at the border of the IBIS FoV (13.4 deg from the center) and thus could not be seen by the JEM-X instrument. The IBIS/ISGRI spectral analysis as compared to a recent Crab observation in a similar off-axis position gives fluxes of 1.0, 0.33 and 0.05 Crab in the 21-36, 36-58 and 60-200 keV bands, respectively. The uncertainties can reach 30% due to the fact that the source is at the border of the FoV. Together with the RXTE ASM observations reported by Remillard et al. (2004 ATEL #371) this suggests a flux maximum in Crab units at an energy around 10-20 keV.