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http://hdl.handle.net/20.500.12386/31982
Titolo: | Late-time radio observations of the short GRB200522A: constraints on the magnetar model | Autori: | Bruni, Gabriele O'Connor, B. Matsumoto, T. Troja, E. Piran, T. PIRO, LUIGI RICCI, ROBERTO |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS | Numero: | 505 | Fascicolo: | 1 | Da pagina:: | L41 | Abstract: | GRB200522A is a short duration gamma-ray burst (GRB) at redshift $z$=0.554 characterized by a bright infrared counterpart. A possible, although not unambiguous, interpretation of the observed emission is the onset of a luminous kilonova powered by a rapidly rotating and highly-magnetized neutron star, known as magnetar. A bright radio flare, arising from the interaction of the kilonova ejecta with the surrounding medium, is a prediction of this model. Whereas the available dataset remains open to multiple interpretations (e.g. afterglow, r-process kilonova, magnetar-powered kilonova), long-term radio monitoring of this burst may be key to discriminate between models. We present our late-time upper limit on the radio emission of GRB200522A, carried out with the Karl G. Jansky Very Large Array at 288 days after the burst. For kilonova ejecta with energy $E_{\rm ej} \approx 10^{53} \rm erg$, as expected for a long-lived magnetar remnant, we can already rule out ejecta masses $M_{\rm ej} \lesssim0.03 \mathrm{M}_\odot$ for the most likely range of circumburst densities $n\gtrsim 10^{-3}$ cm$^{-3}$. Observations on timescales of $\approx$3-10 yr after the merger will probe larger ejecta masses up to $M_{\rm ej} \sim 0.1 \mathrm{M}_\odot$, providing a robust test to the magnetar scenario. | URI: | http://hdl.handle.net/20.500.12386/31982 | URL: | http://arxiv.org/abs/2105.01440v1 https://academic.oup.com/mnrasl/article/505/1/L41/6271321?login=true |
ISSN: | 1745-3925 | DOI: | 10.1093/mnrasl/slab046 | Fulltext: | open |
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