# Supernova SN2025gjc-ESO515-3

**URL:** <https://forum.astro-colibri.science/t/supernova-sn2025gjc-eso515-3/370>\
**Category:** General\
**Tags:** supernova\
**Created:** [April 7, 2025, 11:28am UTC](https://forum.astro-colibri.science/t/supernova-sn2025gjc-eso515-3/370 "2025-04-07T11:28:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![roger.hellot.astro](https://avatars.discourse-cdn.com/v4/letter/r/f08c70/32.png) [@roger.hellot.astro](https://forum.astro-colibri.science/u/roger.hellot.astro)\
**Post date:** [April 7, 2025, 11:28am UTC](https://forum.astro-colibri.science/t/supernova-sn2025gjc-eso515-3/370/1 "2025-04-07T11:28:59Z")

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Hi,  
I made a positive observation of SN 2025gjc (J. Tonry et al., TNSDR No. 2025-1224), detected by ATLAS 2025-04-01 04:38:17.664.  
The SN seems to be part of the Galaxy ESO 515-3. The not calibrated picture is a single shoot of 300s with a L filter (420-680nm), QHY268M camera on CDK17-NKT500 mont, at W96 AITP Observatory in San Pedro-Chili. More precise measurement will fellow.  
Roger Hellot – AITP Observatory - [roger.hellot.astro@gmail.com](mailto:roger.hellot.astro@gmail.com)

 ![2025-04-06_23-06-42_SN2025gjc_300.00s_L-GBp_B1x1_T°-10-PS-crop2](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/4ab6f5ed57aad1c31d3da0532c3aedee9954bb41.jpeg)

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**Author:** ![Fabian.Schussler](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.astro-colibri.science/fabian.schussler/32/25_2.png) [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\
**Post date:** [April 7, 2025, 11:58am UTC](https://forum.astro-colibri.science/t/supernova-sn2025gjc-eso515-3/370/2 "2025-04-07T11:58:32Z")

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Congratulations. This also looks really beautiful!  
The association with ESO 515-3 seems very plausible to me. The redshift of the supernova has been measured to z = 0.0198 (cf. [TNS](https://www.wis-tns.org/object/2025gjc/classification-cert)), and the galaxy is at a redshift of z = 0.0194 (e.g. [Simbad](https://simbad.cds.unistra.fr/simbad/sim-basic?Ident=+ESO+515-3+&submit=SIMBAD+search)).

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**Author:** ![roger.hellot.astro](https://avatars.discourse-cdn.com/v4/letter/r/f08c70/32.png) [@roger.hellot.astro](https://forum.astro-colibri.science/u/roger.hellot.astro)\
**Post date:** [April 7, 2025, 1:00pm UTC](https://forum.astro-colibri.science/t/supernova-sn2025gjc-eso515-3/370/3 "2025-04-07T13:00:55Z")

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Many thanks, Fabian.  
It is again a nice environment.  
I will try to fellow this SN if the magnitude increases. SN IIn types develop sometimes an interesting “plateau”.  
Roger