HETE-2 detction of Superburst from SLX 1735-269
ATel #539; M. Suzuki (RIKEN) and N. Kawai (Tokyo Tech) for the HETE team
on 29 Jun 2005; 16:47 UT
Credential Certification: Nobuyuki Kawai (nkawai@phys.titech.ac.jp)
Subjects: X-ray, Binary, Neutron Star
A long-duration X-ray burst from SLX 1735-269 was detected at 2:17 UT on 20 June 2005 by WXM and FREGATE onboard HETE-2. This burst lasted at least for 24 minutes until the spacecraft made a slew. The long duration of this burst suggests that this event belongs to the class of so-called "superbursts".
A superburst from this source had been detected 644 days before by INTEGRAL on 15, Sep. 2003 (Molkov et al. 2005, A&A, 434, 1069). Molkov et al. incorrectly state that there was only one detected X-ray burst from this source before the INTEGRAL launch. However, HETE-2 had detected three type-I X-ray bursts from this source in 2001 (Sakamoto et al. 2002, AIP Conf. Proc. 662, 94). These three bursts had comparable peak flux (~ 2 Crab) with that of the current superburst, though their durations were much shorter, being only 5--10 secconds.
