DRAFT
2025-07-02 11:31:41
Type: Announcement-Data Release
Bibcode: 2025TNSAN.200....1M
Photometric follow-up of SN2025coe with RAPAS ProAm network
Authors: Thierry Midavaine (SAF, Salvia Observatory), Pascal André (ADAGIO), David Bregou (ADAGIO), Frederic Deanjean (AG33), Jean-Louis Dumont (SAT), David Fardin (ADAGIO), Pierre-Yves Lechapelain (Observatoire de Bretagne Sud), Arnaud Leroy (Uranoscope), Florent Losse (St Pardon de Conques), Jean-Baptiste Marquette (SAF, SF2A, D99), Patrick Martinez (ADAGIO, SAF), Thomas Salomon (AG33), Sébastien Serpaud (ADAGIO), Marc Serrau (SAF, Observatoire de Dauban), Bernard Tregon (Observatoire du Clocher Brantôme-en-Périgord), Fabian Schussler (CEA-Irfu DPhP), Michel Dennefeld (IAP), William Thuillot (LTE Observatoire de Paris)*
Keywords: Instrumentation, Optical, Photometry, Supernova, Time-domain, Transient
Abstract:
We report on the optical photometric follow-up of SN2025coe with RAPAS, a ProAm network using telescopes equipped with a set of filters meeting Gaia photometric bands.

Triggered by an Astro-COLIBRI alert (ATel#17138, discovery 2025-02-24 15:13:06) RAPAS ProAm network monitors SN2025coe from 2025-02-28 to 2025-05-29. It is classified as a Ca-rich Type Ib supernova. During this period, 11 telescopes located in France, using the set of RAPAS A, B and C filters meeting the three Gaia G, Gbp and Grp photometric band specifications, collected 59 measurements in 1, 2 or the 3 Gaia bands. The photometric consistency was ensured by reducing each frame with the corresponding Gaia DR3 reference catalog for G, Gbp and Grp bands.

The multi-band light curve shows a peak in Gbp band on the 2025-03-03, then in Grp band on the 2025-03-05 (uncertainty +/- 0.3d) followed by a monotonic decline with low amplitude undulations. The Gbp-Grp color index reddened steadily from 0.5 mag to 2 mag as the supernova faded beyond G = 20 mag.

 

Detailed light curves and data are presented on the RAPAS web page and Astro-COLIBRI web page on the following links :

https://rapas.imcce.fr/SN2025coe-lightcurve.jpg

https://rapas.imcce.fr/SN2025coe-bp-rp-index.jpg

https://rapas.imcce.fr/SN2025coe_RAPAS.csv

https://storage.googleapis.com/astro-colibri-optical-lightcurve/Astro-C…

https://storage.googleapis.com/astro-colibri-optical-lightcurve/archive…

 

Further details and the full dataset are accessible to registered users of the RAPAS Spreadsheets platform. 

 

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025coe 10:33:07.921 +28:26:12.54 SN Ib-Ca-rich 0.00472 10:33:07.921 +28:26:12.54 SN Ib-Ca-rich 0.00472

Comments

Thierry
Midavaine

Wed, 07/02/2025 - 10:32

Thierry
Midavaine

Wed, 07/02/2025 - 11:25

Thierry
Midavaine

Wed, 07/02/2025 - 20:45

Acknowledgements :

RAPAS ( https://gemini.obspm.fr/20220101-rapas/ ) is a ProAm collaboration created by T. Midavaine (SAF), W. Thuillot (LTE, Obs. de Paris-PSL) and M. Dennefeld (IAP/CNRS and Sorbonne Univ.) and funded by the Paris Observatory under API ProAm of the Scientific Council. It aims at homogenizing observing procedures and filters, and is delivering to a network of french amateur observatories a set of 3 filters which have been chosen to meet the Gaia G, Gbp and Grp spectral bands. This network produces data on  astrophysical alerts delivered by various Alert systems (Gaia Alerts, Atlas, ZTF, etc…) and collected by Astro-COLIBRI ( https://astro-colibri.science ). This network is similarly progressing towards an homogeneous spectroscopic equipment to deliver SED.