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Confirmation of large X-ray outburst from SMC source RX J0059.2-7138 also seen by INTEGRAL

ATel #5766; M. J. Coe (Southampton University), A. J. Bird (Southampton University), A. B. Hill (Southampton University), C. Ferrigno (ISDC), V. Esposito (ISDC), V. A. McBride (UCT/SAAO), E. S. Bartlett (UCT), L. J. Townsend (UCT), F. Haberl (MPE) and A. Udalski (Warsaw).
on 15 Jan 2014; 14:19 UT
Credential Certification: Malcolm Coe (mjcoe@soton.ac.uk)

Subjects: Optical, X-ray, Binary, Transient, Pulsar

Referred to by ATel #: 5772, 5773, 5925, 5930

INTEGRAL observations of the SMC on 11 January 2014 confirm a very bright X-ray detection of the source RX J0059.2-7138 = SXP2.76. Krimm et al (ATel #5756) report detecting the source with Swift/BAT 16 days earlier on 26 Dec 2013. The INTEGRAL JEM-X source position is fully consistent with the position of SXP2.76, but we note no sign of any brightening of the proposed optical counterpart to SXP2.76 in the OGLE IV data in the last month or so. The source is detected by the JEM-X and ISGRI instruments with the fluxes of 12 +/- 1 mCrab in the 3-10 keV energy band, 15 +/- 2 mCrab in the 10-20 keV energy band and 17 +/- 1 mCrab in the 20-40 keV energy band, with a significance of 26, 14 and 27 sigma respectively. It is not detected in the ISGRI hard energy band (40-80 keV) with a 3 sigma upper limit of 3 mCrab.