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We observed the Rapid Burster with Chandra when it was in the 'banana' statethat usually precedes the type-II X-ray bursting 'island' state for which thesource is particularly known. We employed the High-Energy Transmission GratingSpectrometer in combination with the ACIS-S detector in continuous clockingmode. The observation yielded 20 thermonuclear type-I X-ray bursts emitted fromthe neutron star surface with recurrence times between 0.9 and 1.2 hr, and ane-folding decay time scale of 1 min. We searched for narrow spectral featuresin the burst emission that could constrain the composition of the ashes of thenuclear burning and the compactness of the neutron star, but found none. Theupper limit on the equivalent width of narrow absorption lines between 2 and 6keV is between 5 and 20 eV (single trial 3 sigma confidence level) and on thoseof absorption edges between 150 and 400 eV. The latter numbers are comparableto the levels predicted by Weinberg, Bildsten & Schatz (2006) forEddington-limited thermonuclear bursts.

Chandra spectroscopy of Rapid Burster type-I X-ray bursts