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Identification of a Radio Counterpart to SN 2025ulz in the S250818k Localization Area

  • Authors: Tanner O'Dwyer, Alessandra Corsi, Deepika Yadav, Kunal P. Mooley, Raphael Baer-Way, Poonam Chandra, Gregg Hallinan, Mansi M. Kasliwal, Lauren Rhodes, Oleg M. Smirnov, Davide Lazzati, Joeri van Leeuwen, Adam Deller, Pikky Atri, Tanazza Khanam

Tanner O’Dwyer et al 2026 The Astrophysical Journal Letters 1009 .

  • Provider: AAS Journals

Caption: Figure A2.

Observations of the SN 2025ulz field carried out at ν ≈ 6 GHz under our JAGWAR program with the VLA in its CnB (top-left and top-center panels), B (top-right, bottom-left, and center-left panels), and A (bottom-right panel) configurations. In all panels except for the bottom-right one, the black circle marks a region of radius equal to the nominal FWHM of the VLA synthesized beam at ν ≈ 6 GHz and in B configuration (1﹩\mathop{.}\limits^{{\unicode{x02033}}}﹩0), centered on the position of SN 2025ulz as determined by the brightest pixel in HST images. This circle ha a radius of 0﹩\mathop{.}\limits^{{\unicode{x02033}}}﹩33 (nominal VLA FWHM at ν ≈ 6 GHz and in A configuration) in the bottom-right panel. In Table 1, we report the peak radio flux densities measured within this circular region (if above 3 × RMS) and their positional offset and PA from the HST position of SN 2025ulz. The actual VLA beam is plotted as a black ellipse in each panel. The optical position of the host galaxy (SDSS J155154.16+305409.3) center is marked with a black cross. Map colors span flux density values in between ≈−5 ×  RMS and +5 × RMS (see Table 1 for the RMS value of each image). Emission from a faint counterpart from SN 2025ulz is detected at the ≈5σ level on day 89.

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