GRB 090429B
{'<entity_0>': 'gamma-ray burst', '<entity_1>': 'Neil Gehrels Swift Observatory', '<entity_2>': '29 April 2009', '<entity_3>': 'GRB 090429B'}
[['GRB 090429B', 'site of astronomical discovery', 'Neil Gehrels Swift Observatory'], ['GRB 090429B', 'instance of', 'gamma-ray burst'], ['GRB 090429B', 'time of discovery or invention', '29 April 2009'], ['GRB 090429B', 'start time', '29 April 2009'], ['GRB 090429B', 'description', 'gamma-ray burst']]
<entity_3> was a <entity_0> observed on <entity_2> by the Burst Alert Telescope aboard the <entity_1>.
['gamma-ray burst']