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Swift/BAT Observes a Thermonuclear X-ray Burst from SAX J1712.6-3739

ATEL # 2717; T. E. Strohmayer (NASA/GSFC), W.H. Baumgartner (UMBC/NASA GSFC)
on 2 Jul 2010; 20:46 UT
Password Certification: Tod Strohmayer (

Subjects: X-ray, Binaries, Neutron Stars

On July 1, 2010 at 14:55:40.7 (UT) the Swift/BAT triggered on an event whose on-board position was consistent with the known low mass X-ray binary (LMXB) SAX J1712.6-3739 (trigger number 426405). Analysis of the BAT event data indicates that the burst is only detected in the 10 - 25 keV band, has a duration of approximately 20 s and a flux history typical of thermonuclear X-ray bursts. The peak flux (2 s bins) in the 10 - 28 keV band is estimated at approximately 4 x 10^-8 ergs/cm^2/s, which is close to the Eddington luminosity for a canonical neutron star if placed at the distance to the Galactic center (8 kpc). We conclude that this event is a thermonuclear burst from SAX J1712.6-3739. The only previous reports of X-ray bursts from this source include an event from 1999 September observed with the BeppoSAX Wide Field Camera (Cocchi et al., IAUC 7247) with properties similar to the BAT event reported here, and an event suggested to be an intermediate duration burst based on RXTE/ASM data (Kuulkers, Atel #2141).

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