Image Details
Caption: Figure 2.
A BPT (J. A. Baldwin et al. 1981) analysis of the host of AT2025ulz (violet) based on its DESI spectrum and including for comparison the host galaxies of known gamma-ray bursts with an associated candidate KN (GRB160821B and GRB211211A) observed by DESI. The galaxy is a standard star-forming galaxy, similar to the hosts of known GRB-KN. Notably, the host of AT2017gfo (associated with GW170817) has weak AGN lines that are not present in any of the other galaxies (A. Palmese et al. 2017). The background contours are made from the FastSpecFit value-added catalog for DESI DR2 data (FastSpecFit version 3.2.0; J. Moustakas et al. 2023; DESI Collaboration et al. 2025b; J. Moustakas et al. 2026, in preparation). Separation lines are drawn from L. J. Kewley et al. (2001), G. Kauffmann et al. (2003), and L. J. Kewley et al. (2006).
Other Images in This Article
Copyright and Terms & Conditions
© 2026. The Author(s). Published by the American Astronomical Society.
