Two Predictions of supernova: GRB 130427A / SN 2013cq and GRB 180728A / SN 2018fip

摘要: On 2018 July 28, GRB 180728A triggered \textit{Swift} satellites and, soon after the determination of redshift, we identified this source as a type II binary-driven hypernova (BdHN II) in our model. Consequently, predicted appearance time its associated supernova (SN), which was later confirmed SN 2018fip. A BdHN originates binary composed carbon-oxygen core (CO$_{\rm core}$) undergoing SN, and ejecta hypercritically accrete onto companion neutron star (NS). From shock breakout to when hypercritical accretion starts, infer separation $\simeq 3 \times 10^{10}$ cm. The explains prompt emission isotropic energy 10^{51}$ erg, lasting $\sim 10$ s, accompanying observed blackbody from thermal convective instability bubble. new ($\nu$NS) originating powers late afterglow $\nu$NS initial spin $2.5$ ms is inferred. We compare with 130427A, I I) $> 10^{54}$ erg. For 130427A have inferred an initially closer cm, implying higher rate leading collapse NS consequent black hole formation, faster, $1$ spinning $\nu$NS. In both cases, optical spectra SNe are similar, not correlated gamma-ray burst. present three-dimensional smoothed-particle-hydrodynamic simulations visualisations BdHNe II.