We describe a 325-MHz survey , undertaken with the Giant Metrewave Radio Telescope ( GMRT ) , which covers a large part of the three equatorial fields at 9 , 12 and 14.5 h of right ascension from the Herschel -Astrophysical Terahertz Large Area Survey ( H-ATLAS ) in the area also covered by the Galaxy And Mass Assembly survey ( GAMA ) .
The full dataset , after some observed pointings were removed during the data reduction process , comprises 212 GMRT pointings covering \sim 90 deg ^ { 2 } of sky .
We have imaged and catalogued the data using a pipeline that automates the process of flagging , calibration , self-calibration and source detection for each of the survey pointings .
The resulting images have resolutions of between 14 and 24 arcsec and minimum rms noise ( away from bright sources ) of \sim 1 mJy beam ^ { -1 } , and the catalogue contains 5263 sources brighter than 5 \sigma .
We investigate the spectral indices of GMRT sources which are also detected at 1.4 GHz and find them to agree broadly with previously published results ; there is no evidence for any flattening of the radio spectral index below S _ { 1.4 } = 10 mJy .
This work adds to the large amount of available optical and infrared data in the H-ATLAS equatorial fields and will facilitate further study of the low-frequency radio properties of star formation and AGN activity in galaxies out to z \sim 1 .