Supernova SN 2024ggi
and its progenitor
 in NGC 3621

This was the brightest supernova of 2024.

The supernova was discovered by ATLAS on 11 April 2024.

More information and images here: https://rochesterastronomy.org/sn2024/sn2024ggi.html

All supernovae updates here: https://rochesterastronomy.org/snimages/index.html

TNS [Transient Name Server] entry for 2024ggi : https://www.wis-tns.org/object/2024ggi

Wikipedia page for host galaxy NGC 3621: https://en.wikipedia.org/wiki/NGC_3621

The candidate progenitor of SN 2024ggi can be found in the Hubble Picture of the week posted on 14 October 2013.

Note:  In this image, north is 69.0° right of vertical.

The red star in the center [the candidate progenitor] has previously been cataloged by the VISTA Hemisphere Survey as VHS J111822.09-325015.2

It was also cataloged in the Hubble Source Catalog for NGC 3621 as
 MatchID 140066549 with coordinates RA 169.59202035259474 , DEC -32.83757282765759

Compare with the published coordinates of SN 2024ggi : RA 169.592030529 , DEC -32.8375756395

The difference is RA 0.00001017640526 , DEC 0.00000281184241 , which is about .038 seconds of arc.

Another view of the candidate progenitor dated 2003-02-03.  Note, in this view, North is up.

This screenshot comes from the Hubble Legacy Archive from this URL.

Another view of the candidate progenitor dated 1994-12-27.  Note: In this screenshot, North is up.

This screenshot comes from the Hubble Legacy Archive from this URL.  Note:  In the archive image, South is up.

More discussion of the progenitor of SN 2024ggi at the following 3 links:

https://www.wis-tns.org/astronotes/astronote/2024-100

https://www.wis-tns.org/astronotes/astronote/2024-105

 https://www.wis-tns.org/astronotes/astronote/2024-107

Further reading:

Late-time Hubble Space Telescope Ultraviolet Spectra of SN 2023ixf and SN 2024ggi Show Ongoing Interaction with Circumstellar Material by K. Azalee Bostroem et al., 15 August 2025.

Constraints on the progenitor and explosion of SN 2024ggi in harmony with pre-explosion detection and hydrodynamic simulations by Dr. Amar Aryan et al., 14 August 2025.

Optical and near-infrared nebular-phase spectroscopy of SN 2024ggi: constraints on the structure of the inner ejecta, progenitor mass, and dust by Emilio Hueichapán et al., 4 August 2025.

The nebular phase of SN 2024ggi: a low-mass progenitor with no signs of interaction by Lucía Ferrari et al., 30 July 2025.

JWST Observations of SN 2024ggi I: Interpretation and Model Comparison of the Type II Supernova 2024ggi at 55 days Past Explosion by Edward A. Baron et al., 24 July 2025.

 An optical to infrared study of type II SN2024ggi at nebular times by Luc Dessart et al.,  8 July 2025.

Discovery and Extensive Follow-up of SN 2024ggi, a Nearby Type IIP Supernova in NGC 3621 by  Ting-Wan Chen et al., 10 April 2025.

SN 2024ggi: another year, another striking Type II supernova by K. Ertini et al, 4 March 2025. 

Early-time millimeter observations of the nearby Type II SN 2024ggi by Maokai Hu et al, 16 December 2024.

Constraining the progenitor of the nearby Type II-P SN 2024ggi with environmental analysis by Xinyi Hong et al., 3 December 2024.

The compact circumstellar material of SN 2024ggi: Another supernova with a pre-explosion effervescent zone and jet-driven explosion by Noam Soker, 25 June 2024.

Discovery and Extensive Follow-Up of SN 2024ggi, a nearby type IIP supernova in NGC 3621 by Ting-Wan Chen et al., 13 June 2024.

Probing the Shock Breakout Signal of SN 2024ggi from the Transformation of Early Flash Spectroscopy by Jujia Zhang et al., 12 June 2024.

Extended Shock Breakout and Early Circumstellar Interaction in SN 2024ggi by Manisha Shrestha et al., 28 May 2024.

The Red Supergiant Progenitor of Type II Supernova 2024ggi by Danfeng Xiang et al., 14 May 2024.

Early phase simultaneous multi-band observations of Type II supernova SN 2024ggi with Mephisto by Xinlei Chena et al., 13 May 2024

Early flash-ionization lines in SN 2024ggi revealed by high-resolution spectroscopy by Thallis Pessi et al., 3 May 2024.

SN 2024ggi in NGC 3621: Rising Ionization in a Nearby, CSM-Interacting Type II Supernova by Wynn Jacobson-Galan et al., 29 April 2024.

  The direct identification of core-collapse supernova progenitors by Schuyler D. Van Dyk , 18 September 2017.