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INTEGRAL detection of MAXI J0911-655: still active

ATel #9738; L. Ducci et al. (IAAT, Germany; ISDC, Switzerland), K. Watanabe (FGCU, USA), C. Sanchez (ESA/ESAC, Spain), R. Diehl (MPE, Germany), E. Bozzo, C. Ferrigno (ISDC, Switzerland)
on 10 Nov 2016; 07:07 UT
Distributed as an Instant Email Notice Transients
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Neutron Star, Transient, Pulsar

Referred to by ATel #: 9740, 10425

During the INTEGRAL observations of the Carina region carried out from 2016 November 6 to November 8 (total exposure time 141 ks), significant hard X-ray emission was detected with IBIS/ISGRI from the recently discovered Accreting Millisecond X-ray Pulsar MAXI J0911-655 (Atel #8872, #8884, #8914, #8971, #8986; see also Sanna et al., A&A, in press, arXiv:1611.02995).

The source was detected in the IBIS/ISGRI mosaic images at a significance level of 8.2 (4.7) sigma and a flux of 7+/-1 mCrab (7+/-1 mCrab) in the 20-40 keV (40-80 keV) energy band. The large off axis of the source with respect to the observation coordinates (~12 degrees) and the relatively low flux of the source does not allow to perform a detailed analysis of its spectral and timing properties.

MAXI J0911-655 was outside the field of view of the JEM-X instrument during the whole observation.

Additional INTEGRAL observations of the region around the source are already planned for the coming week.

Further observations of the source in soft X-rays, as well as in other energy domains, are encouraged.