During a BeppoSAX observation of the X-ray burst source X 1732-304 located in the globular cluster Terzan 1 in 1999 April , the source was detected in an anomalously low-state with an X-ray luminosity of 1.4 \times 10 ^ { 33 } erg s ^ { -1 } , about 300 times fainter than the lowest previously reported measure of the persistent flux .
The spectral shape and intensity of this low-state emission is similar to that of a number of neutron star soft X-ray transients in quiescence , being well fit by a \simeq 0.34 keV blackbody together with a power-law with a photon index of 1.0 \pm ^ { 1.0 } _ { 1.3 } .
These similarities suggest that the same mechanism , such as the inhibition of accretion due to the propeller effect , is also operating in X 1732-304 .
Alternatively , the X 1732-304 low-state may be due to obscuration of the line of sight to the central neutron star , with only scattered and/or reflected X-rays being detected .
The possibility that the source detected by BeppoSAX is not X 1732-304 , but a nearby dim source of the cluster field ( what would make the observed dimming of X 1732-304 even more remarkable ) is also discussed .