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INTEGRAL detection of an intermediate long X-ray burst from SLX 1737-282

ATEL # 1338; Sguera V., (INAF/IASF Bologna), Bazzano A., (INAF/IASF Roma), Bird A.J., (Univ. Southampton), Tarana A., (INAF/IASF Roma)
on 19 Dec 2007; 16:33 UT
Password Certification: Vito Sguera (

Subjects: Gamma Ray, Neutron Stars

From archival IBIS data search, we report a newly discovered intermediate
long type I X-ray burst from the ultra-compact binary candidate SLX 1737-282.
It was detected on 9 March 2004 with a duration of about 10 minutes
and a peak flux of about 750 mCrab (20-30 keV). The ISGRI spectrum is
well described by a black body model with kT=2.5+/-0.3 keV. This is the fourth
intermediate long X-ray burst detected from the source, the other three reported
ones having a very similar duration, in the range 10--15 minutes
(in't Zand et al. 2002, A&A, 389, L43; Falanga et al. 2007, astroph 0711.0328).
In the light of the findings reported above, SLX 1737-282 is the only X-ray
burster known to exclusively displays intermediate long type I X-ray burst.

We note that this newly discovered type I X-ray burst, together with those
reported in the literature, are compatible with a recurrence period of
about 80 days as suggested by Falanga et al. 2007.

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R. E. Rutledge , Editor
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