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ATEL # 1340; V. Sguera (INAF/IASF Bologna), A. Bazzano (INAF/IASF Roma), A. J. Bird (Univ. Southampton)
on 21 Dec 2007; 14:20 UT
Password Certification: Vito Sguera (firstname.lastname@example.org)
Subjects: Gamma Ray, Neutron Stars
From archival IBIS data search, we report a newly discovered long burst
from the LMXB system SLX 1735-269,detected by INTEGRAL on 13 April 2004.
The burst lasted about 10 minutes reaching a peak flux of about 525 mCrab (20-30 keV);
the ISGRI spectrum is well described by a black body model with kT=2.6+/-0.4 keV.
SLX 1735-269 is known to usually display ordinary type I X-ray bursts (5-10 seconds duration),
as far as we know this newly discovered long burst is only the second ever reported,
the other one also having been detected by INTEGRAL on 15 September 2003
(Molkov et al. 2005, A&A, 434, 1069). In addition, a superburst lasting about
24 minutes has been detected by HETE-2 on 20 June 2005 (ATel #539).