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Assuming that the differential rotation of the massive neutron star (NS)formed in the double NS (DNS) mergers has been effectively terminated by themagnetic braking and a uniform rotation has been subsequently established(i.e., a supramassive NS is formed), we analytically derive in this work anapproximated expression for the critical total gravitational mass ($M_{\rmtot,c}$) to form supramassive NS (SMNS) in the DNS mergers, benefited from someequation of state (EoS) insensitive relationships. The maximum gravitationalmass of the nonrotating NSs ($M_{\rm TOV}$) as well as the dimensionlessangular momentum of the remnant ($j$) play the dominant roles in modifying$M_{\rm tot,c}$, while the radius and mass differences of the premerger NSs donot. The GW170817/GRB 170817A/AT2017gfo observations have provided so far thebest opportunity to quantitatively evaluate $M_{\rm TOV}$. Supposing thecentral engine for GRB 170817A is a black hole quickly formed in the collapseof an SMNS, we find $M_{\rm TOV}=2.13^{+0.09}_{-0.08}M_\odot$ (68.3%credibility interval, including also the uncertainties of the EoS insensitiverelationships), which is consistent with the constraints set by current NS massmeasurements.

Estimating the maximum gravitational mass of nonrotating neutron stars from the GW170817/GRB 170817A/AT2017gfo observation