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GCN Circular 36341

LIGO/Virgo/KAGRA S240422ed: ENGRAVE VLT/XShooter spectroscopy of the host galaxy of J-GEM24a
2024-04-29T00:56:26Z (20 days ago)
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K. Maguire (Trinity College Dublin), A. Levan (Radboud), F. Fortin (IRAP, Toulouse) report on behalf of the ENGRAVE collaboration: 
We obtained a VLT+XShooter spectrum of the potential host galaxy of J-GEM24a (Takahashi et al., GCN 36333), GL080850-243120, suggested as a potential counterpart to S240422ed (LVK, GCN 36236), on UT 2024-04-28. Multiple host lines (Ca II H&K, Na I D) are identified at a redshift of 0.055.

This redshift is inconsistent with the S240422ed GW distance estimate at the coordinates of J-GEM24a of 170 +/-42 Mpc at the 2 sigma level. 

We thank the ESO observing staff and observers at Paranal who allowed us to undertake these observations. Based on observations collected by the ENGRAVE collaboration at the European Southern Observatory under ESO programme 108.22JF.021.

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