Indian astronomers detect optical flare in one of the oldest astronomical objects PTI Updated Feb 13, 2021, 6:54 pm IST The data collected from the flare observed will help calculation of the black hole mass, size of emission region, and other processes Department of Science and Technology believes feeding super massive black hole can help trace the mass of the black hole (Representational image) New Delhi: Indian astronomers have reported one of the strongest flares from a feeding super massive black hole or blazar called BL Lacertae, analysis of which can help trace the mass of the black hole and the source of this emission, the Department of Science and Technology said on Saturday.