Phased Array Feed ( PAF ) technology is the next major advancement in radio astronomy in terms of combining high sensitivity and large field of view .
The Focal L-band Array for the Green Bank Telescope ( FLAG ) is one of the most sensitive PAFs developed so far .
It consists of 19 dual-polarization elements mounted on a prime focus dewar resulting in seven beams on the sky .
Its unprecedented system temperature of \sim 17 K will lead to a 3 fold increase in pulsar survey speeds as compared to contemporary single pixel feeds .
Early science observations were conducted in a recently concluded commissioning phase of the FLAG where we clearly demonstrated its science capabilities .
We observed a selection of normal and millisecond pulsars and detected giant pulses from PSR B1937+21 .