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Probing the Origin of the Kilonova Candidate GRB 230307A: Analysis of Host Galaxy and Offset

  • Authors: Clecio R. Bom, Davi C. Rodrigues, Arianna Cortesi, Amanda E. Araujo-Carvalho, Daniel Ruschel-Dutra, Giuliano Iorio, Luidhy Santana-Silva, Charles D. Kilpatrick, Fabricio Ferrari, Luis Lomelí-Núñez, Thomas Harvey, Duncan Austin, Christopher J. Conselice, Nathan Adams, Roberto Cid Fernandes

Clecio R. Bom et al 2026 The Astrophysical Journal Letters 1001 .

  • Provider: AAS Journals

Caption: Figure 1.

A color–magnitude diagram of a sample of GCs from J. P. Blakeslee et al. (2012) in I and H band compared with limits on a counterpart to GRB 230307A in F070W and F150W. The red line corresponds to our joint detection threshold to point sources in F070W and F150W, with the gray region containing detected point sources and the white region containing undetected point sources. We rule out nearly all of the GCLF, implying that it is extremely unlikely that the progenitor of GRB 230307A formed in situ in a GC.

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