Discovery of SAX J1753.5-2349 and SAX J1806.5-2215: two X-ray bursters without detectable steady emission

Abstract

We report the discovery with BeppoSAX-WFC of two new X-ray sources that were only seen during bursts: SAX J1753.5-2349 and SAX J1806.5-2215. For both sources, no steady emission was detected above an upper limit of 5 mCrab (2 to 8 keV) for 3 10**5 s around the burst events. The single burst detected from SAX J1753.5-2349 shows spectral softening and a black body color temperature of 2.0 keV. Following the analogy with bursts in other sources the burst very likely originates in a thermonuclear flash on a neutron star. The first of two burst detected from SAX J1806.5-2215 does not show spectral softening and cannot be confirmed as a thermonuclear flash.

arXiv comment4 pages, 4 figures, to be published in Proceedings of the Symposium "The Active X-Ray Sky: Results from BeppoSAX and Rossi-XTE", Rome, Italy, 21-24 October, 1997, Nuclear Physics B Proceedings Supplements. Eds. L. Scarsi, H. Bradt, P. Giommi, and F. Fiore

References in corpus (2)

• First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer
• Discovery of the X-ray transient SAX J1808.4-3658, a likely low mass X-ray binary

Cited by in corpus (14)

• The Multi-INstrument Burst ARchive (MINBAR)
• Accretion disks and coronae in the X-ray flashlight
• BeppoSAX Wide Field Cameras observations of six type I X-ray bursters
• Discovery of the X-ray burster SAX J1752.3-3138
• Chandra follow-up of bursters with low persistent emission
• BeppoSAX-WFC monitoring of the Galactic Center region
• UltraCompCAT: a comprehensive Catalogue of Ultra-Compact and Short Orbital Period X-ray Binaries
• Linking burst-only X-ray binary sources to faint X-ray transients
• Fast X-ray Transients and Their Connection to Gamma-Ray Bursts
• The Swift Bulge Survey: optical and near-IR follow-up featuring a likely symbiotic X-ray binary & a focused wind CV
• Unveiling the hard X-ray spectrum from the "burst-only" source SAX J1753.5-2349 in outburst
• Near-infrared counterparts of three transient very faint neutron star X-ray binaries
• A search for near-infrared counterparts of two faint neutron star X-ray transients : XMMU J174716.1-281048 and SAX J1806.5-2215
• Spectral Properties of a Sample of Low Luminosity Type I X-ray Bursters