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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17774
Message-Id: <20260506070320.A8BBF28804C2@server.astronomerstelegram.org>
Date: Wed,  6 May 2026 03:03:20 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17774							     ATEL #17774

Title:	ATCA detection of SN 2024ggi
Author:	S. Lazarevic (U. Western Sydney, CSIRO), K. Rose (U. Sydney,
		CSIRO), R. Alsaberi (U. Western Sydney, Gifu U.), Z. Smeaton (U. Western
		Sydney), on behalf of the RISE collaboration
Queries:	kovirose@gmail.com
Posted:	5 May 2026; 11:36 UT
Subjects:Radio, Supernovae

As part of an ongoing study of core-collapse supernovae we observed the
Type II supernova SN 2024ggi in NGC 3621 with the Australia Telescope Compact
Array (ATCA) on 15 April 2026 09:30-13:30 UTC. SN 2024ggi was detected
at 5.5 GHz with a flux density of 0.56 +/- 0.06 mJy and 9.0 GHz with a
flux density of 0.39 +/- 0.05 mJy.

Adopting a 7 Mpc distance to the host galaxy these fluxes correspond to
specific luminosities of 3.3E+25 erg/sec/Hz and 2.3E+25 erg/sec/Hz at 5.5
GHz and 9.0 GHz, respectively. This implies a significant brightening in
the two years since the previous reported radio detection of SN 2024ggi
(see ATEL #16616).

The ATCA is part of the Australia Telescope National Facility which is
funded by the Commonwealth of Australia for operation as a National Facility
managed by CSIRO. We acknowledge the Gomeroi people as the traditional
owners of the Observatory site.

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