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An X-ray monitoring campaign with Chandra and Swift confirms that 1RXSJ171824.2-402934 is accreting at the lowest rate among the known persistentlyaccreting low-mass X-ray binaries. A thermonuclear X-ray burst was detectedwith the all-sky monitor on RXTE. This is only the second such burst seen in1RXS J171824.2-402934 in more than 20 Ms of observations done over 19 years.The low burst recurrence rate is in line with the low accretion rate. Thepersistent nature and low accretion rate can be reconciled within accretiondisk theory if the binary system is ultracompact. An unprecedentedly shortorbital period of less than approximately 7 minutes would be implied. Anultracompact nature, together with the properties of the type I X-ray burst,suggests, in turn, that helium-rich material is accreted. Optical follow-up ofthe Chandra error region does not reveal an unambiguous counterpart.

Monitoring campaign of 1RXS J171824.2-402934, the low-mass X-ray binary with the lowest mass accretion rate