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Caption: Figure 4.
A comparison of the sSFR versus stellar mass of CC SNe (S. Schulze et al. 2021), sGRBs (A. E. Nugent et al. 2022; B. O’Connor et al. 2022), GRB-KN (A. Gal-Yam et al. 2006; Z.-P. Jin et al. 2016; J. C. Rastinejad et al. 2022; E. Troja et al. 2022; A. Levan et al. 2024; Y.-H. Yang et al. 2024), AT2017gfo (A. Palmese et al. 2017; A. E. Nugent et al. 2022), and the host of AT2025ulz (see Table 2). We have limited the redshift of all events shown here to z < 0.6 for comparison to the highest-z GRB-KN candidate (GRB200522A at z = 0.554; W. Fong et al. 2021; B. O’Connor et al. 2021). The position of AT2025ulz’s host is consistent with both CC SNe and sGRBs.
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© 2026. The Author(s). Published by the American Astronomical Society.
