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From: atel@astronomerstelegram.org
Subject: ATel  17631
Message-Id: <20260127070627.CEE1E28806DE@server.astronomerstelegram.org>
Date: Tue, 27 Jan 2026 02:06:27 -0500 (EST)

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ATEL #17631							     ATEL #17631

Title:	ASKAP radio limits on SN 2026ayt
Author:	K. Rose (U. Sydney, CSIRO) and S. Ryder (Macquarie U.) on
		behalf of the VAST collaboration
Queries:	kovirose@gmail.com
Posted:	27 Jan 2026; 04:37 UT
Subjects:Radio, Supernovae

Following the recent discovery of nearby core-collapse SN 2026ayt, we report
3-sigma limits obtained in the past year with CSIRO's Australian SKA Pathfinder
(ASKAP). These observations provide useful constraints on any pre-explosion
outbursts and demonstrate that any future radio emission from SN 2026ayt
should be resolvable from the host nucleus in future ASKAP observations.

We performed forced fitting on the publicly-available ASKAP observations
and measured the following limits at the supernova position:

<table> 
<tr> 
<td>Date [UTC]</td> 
<td>S_I [mJy]</td> 
<td>Freq. [MHz]</td> 
<td>Len. [hr]</td> 
<td>Survey</td> 
</tr> 
<tr> 
<td>2025 Feb 14.48:</td> 
<td><0.138</td> 
<td>1368</td> 
<td>8</td> 
<td>WALLABY</td> 
</tr> 
<tr> 
<td>2025 Feb 20.48:</td> 
<td><0.162</td> 
<td>1368</td> 
<td>8</td> 
<td>WALLABY</td> 
</tr> 
<tr> 
<td>2025 Aug 02.29:</td> 
<td><0.321</td> 
<td>888</td> 
<td>2</td> 
<td>FLASH</td> 
</tr> 
</table>

The observations used are from the First Large Absorption Survey in HI
(FLASH, Hyein et al. 2025) and Widefield ASKAP L-band Legacy All-sky Blind
surveY (WALLABY, Koribalski et al. 2020). All observations were conducted
with a bandwidth of 288 MHz.

We provide the corresponding ASKAP cutout images here: <a  href="https://drive.google.com/file/d/1k1FHcFGYjk8XLblSwNvL1aLxyD-BS2L2/view?usp=sharing">
https://drive.google.com/file/d/1k1FHcFGYjk8XLblSwNvL1aLxyD-BS2L2/view?usp=sharing</a>.

This work uses data obtained from Inyarrimanha Ilgari Bundara / the CSIRO's
Murchison Radio-astronomy Observatory. We acknowledge the Wajarri Yamaji
People as the Traditional Owners and native title holders of the Observatory
site. CSIRO's ASKAP radio telescope is part of the Australia Telescope
National Facility (<a href="https://ror.org/05qajvd42">https://ror.org/05qajvd42
</a>). Operation of ASKAP is funded by the Australian Government with support
from the National Collaborative Research Infrastructure Strategy. ASKAP
uses the resources of the Pawsey Supercomputing Research Centre. Establishment
of ASKAP, Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy
Observatory and the Pawsey Supercomputing Research Centre are initiatives
of the Australian Government, with support from the Government of Western
Australia and the Science and Industry Endowment Fund. Archived data can
be obtained through the CSIRO ASKAP Science Data Archive, <a  href="http://data.csiro.au">
CASDA </a>.

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