OUP accepted manuscript

2020/12/31 by B. O'Connor, E. Troja, S. Dichiara +23 · 46 citations
Physics and Astronomy · #Approx #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Ejecta #Galaxy #Gamma-ray burst #Gamma-ray bursts and supernovae #Kilonova #Neutron star #Physics #Population #Supernova #astro-ph.HE

paper · pdf · doi:10.1093/mnras/stab132

published in Monthly Notices of the Royal Astronomical Society (Oxford University Press) · MNRAS, In Press

openalex created_date 2020/12/07 · openalex publication_date 2021/01/01 · arxiv created 2021/01/14 · arxiv updated 2021/01/27 · openalex updated_date 2026/08/08

Abstract

We present a detailed multi-wavelength analysis of two short Gamma-Ray Bursts (sGRBs) detected by the Neil Gehrels Swift Observatory: GRB 160624A at z=0.483 and GRB 200522A at z=0.554. These sGRBs demonstrate very different properties in their observed emission and environment. GRB 160624A is associated to a late-type galaxy with an old stellar population (≈3 Gyr) and moderate on-going star formation (≈1 M_\odot yr^-1). Hubble and Gemini limits on optical/nIR emission from GRB 160624A are among the most stringent for sGRBs, leading to tight constraints on the allowed kilonova properties. In particular, we rule out any kilonova brighter than AT2017gfo, disfavoring large masses of wind ejecta (\lesssim0.03 M_\odot). In contrast, observations of GRB 200522A uncovered a luminous (L_\textrmF125W≈ 10⁴² erg s^-1 at 2.3~d) and red (r-H≈ 1.3 mag) counterpart. The red color can be explained either by bright kilonova emission powered by the radioactive decay of a large amount of wind ejecta (0.03 M_\odot \lesssim M \lesssim 0.1 M_\odot) or moderate extinction, E(B-V)≈0.1-0.2 mag, along the line of sight. The location of this sGRB in the inner regions of a young (≈0.1 Gyr) star-forming (≈2-6 M_\odot yr^-1) galaxy and the limited sampling of its counterpart do not allow us to rule out dust effects as contributing, at least in part, to the red color.

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