Although the high sensitivity of the feed system in the Ooty Radio Telescope, located in southern India, has allowed it to be used for the studies of astrophysical phenomena in the past, it is currently no longer in use.
The ORT was completed in 1970 and continues to be one of the most sensitive radio telescopes in the world. As of 2017, the ORT is undergoing a major upgrade to its receiver chain, which will result in a new system called the Ooty Wide Field Array (OWFA). Additionally this upgrade is also expected to open other avenues of research particularly in the newly emerging areas of 21 cm (8.3 in) intensity mapping and studies of transient radio sources. 
