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A Schwarzschild Black Hole (BH) is the gravitational field due to a neutralpoint mass, and it turns out that the gravitational mass of a neutral pointmass: $M=0$ (Arnowitt, Deser, Misner, PRL 4, 375, 1960). The same result isalso suggested by Janis, Newman, and Winicour (PRL 20, 878, 1968). In 1969, Belgave an explicit proof that for a Schwarzschild BH, $M=0$ (Bel, JMP 10, 1051,1969). The same result follows from the fact the timelike geodesic of a testparticle would turn null if it would ever arrive at an event horizon (Mitra,FPL, 2000, 2002). Non-occurrrence of trapped surfaces in continuedgravitational collapse too demands $M=0$ for black hole (Mitra, Pramana, 73,615, 2009).  Physically, for a point mass at $R=0$, one expects ${\it Ric} \sim M \delta(R=0)$ (Narlikar \& Padmanabhan, Found. Phys., 18, 659, 1988). But the blackhole solution is obtained from ${\it Ric} =0$. Again this is the most directproof that $M=0$ for a Schwarzschild black hole. Implication of this result isthat the observed massive black hole candidates are non-singular quasi blackholes or black hole mimickers which can possess strong magnetic fields as hasbeen observed. The echoes from LIGO signals, if true, may be the directevidence that the pertinent compact objects are BH mimickers and not truevacuum BHs.

Mass of Schwarzschild Black Holes Is Indeed Zero And Black Hole Candidates Are Quasi Black Holes