  The transient X-ray source GS 1826-238 was monitored during five different
observing periods between August 1996 and October 1998 with the BeppoSAX Wide
Field Camera instrument in the framework of a deep observation of the Galactic
Center region. A first detection of X-ray bursts from this source occurred,
ruling out its previously suggested black hole candidacy and strongly
suggesting the compact object to be a weakly magnetized neutron star. During
the 2.5 years of monitoring, corresponding to ~2.0 Ms observing time, 70 bursts
were detected from the source. We here report a quasi-periodicity of 5.76 h in
the burst occurrence time which is present during all observations. This is the
first example of quasi-periodic bursting over a period of years. It is in line
with the history of a rather constant flux since the turn on in 1988 and points
to a very stable accretion.
