The striped 'trousers' seem wrong for a Brown Falcon. I would guess Brown Goshawk or Collard Sparrowhawk. Did you get any other photos showing the tail shape, or photos from any other angles? If you did, could you please edit the sighting and add them
Brown Goshawk (A. fasciatus) suggested rather than Collared sparrowhawk (A. cirrocephalus) by heavy bill compared to skull and more robust legs and feet. Normal diagnostic marks are either cut our of photo (notched or square V rounded tail) or unusable due to decomposition (heavy looking brow ridge).