We determine the low-redshift field galaxy stellar mass function ( GSMF ) using an area of 143 deg ^ { 2 } from the first three years of the Galaxy And Mass Assembly ( GAMA ) survey .
The magnitude limits of this redshift survey are r < 19.4 mag over two thirds and 19.8 mag over one third of the area .
The GSMF is determined from a sample of 5210 galaxies using a density-corrected maximum volume method .
This efficiently overcomes the issue of fluctuations in the number density versus redshift .
With H _ { 0 } = 70 { km s ^ { -1 } Mpc ^ { -1 } } , the GSMF is well described between 10 ^ { 8 } and 10 ^ { 11.5 } { M } _ { \odot } using a double Schechter function with { \cal M } ^ { * } = 10 ^ { 10.66 } { M } _ { \odot } , \phi _ { 1 } ^ { * } = 3.96 \times 10 ^ { -3 } { Mpc } ^ { -3 } , \alpha _ { 1 } = -0.35 , \phi _ { 2 } ^ { * } = 0.79 \times 10 ^ { -3 } { Mpc } ^ { -3 } and \alpha _ { 2 } = -1.47 .
This result is more robust to uncertainties in the flow-model corrected redshifts than from the shallower Sloan Digital Sky Survey main sample ( r < 17.8 mag ) .
The upturn in the GSMF is also seen directly in the i -band and K -band galaxy luminosity functions .
Accurately measuring the GSMF below 10 ^ { 8 } { M } _ { \odot } is possible within the GAMA survey volume but as expected requires deeper imaging data to address the contribution from low surface-brightness galaxies .