Commensal transient searches with meerkat in gamma-ray burst and supernova fields

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dc.contributor.authorVaccari, Mattia
dc.contributor.authorChastain, Sarah
dc.contributor.authorvan der Horst, Alexander
dc.date.accessioned2025-10-27T09:52:29Z
dc.date.available2025-10-27T09:52:29Z
dc.date.issued2025
dc.description.abstractThe sensitivity and field of view of the MeerKAT radio telescope provide excellent opportunities for commensal transient searches. We carry out a commensal transient search in supernova and short gamma-ray burst fields using methodologies established by S. I. Chastain et al. We search for transients in MeerKAT L-band images with integration times of 30 minutes, finding 13 variable sources. We compare these sources to the VLASS and RACS survey data, and examine possible explanations for the variability. Additionally, for one of these sources we examine archival Chandra ACIS data. We find that 12 of these sources are consistent with variability due to interstellar scintillation. The remaining source could possibly have some intrinsic variability. We also split the MeerKAT L band into upper and lower halves, and search for transients in images with an integration time of 8 s. We find a source with a duration of 8-16 s that is highly polarized at the lowest frequencies. This source is spatially coincident with a star detected by the Transiting Exoplanet Survey Satellite. We conclude that this source may be consistent with a stellar flare. Finally, we calculate accurate upper and lower limits on the transient rate using transient simulations.
dc.identifier.citationChastain, S.I., van der Horst, A.J., Horesh, A., Rowlinson, A., Andersson, A., Diretse, R., Vaccari, M., Fender, R.P. and Woudt, P.A., 2025. Commensal Transient Searches with MeerKAT in Gamma-Ray Burst and Supernova Fields. The Astrophysical Journal, 988(2), p.227.
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ade70a
dc.identifier.urihttps://hdl.handle.net/10566/21153
dc.language.isoen
dc.publisherInstitute of Physics
dc.subjectMeerkat
dc.subjectGamma-Ray Burst
dc.subjectSupernova Fields
dc.subjectTransient Searches
dc.subjectInterstellar Scintillation
dc.titleCommensal transient searches with meerkat in gamma-ray burst and supernova fields
dc.typeArticle

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