AT2024ltj/ZTF24aashinc confirmation of the supernova classification with GRANDMA/TAROT-Chili
ATel #16667; Y. Rajabov (UBAI), M. Molham (NRIAG), S. Antier (OCA), T. Bonzi (Berkeley), A. Le Calloch (Berkeley), S. Karpov (FZU), M. Coughlin (UMN), P. Hello (IJCLAB), P-A Duverne (APC), D. Turpin (CEA-Saclay/Irfu), N. Guessoum (AUS), T. Pradier (Unistra/IPHC), A. Klotz (CNRS-OMP-IRAP), M. Boer (OCA), A. S. Gervasoni (OCA), C. Limonta (OCA), J. Peloton (IJCLAB)
on 23 Jun 2024; 10:34 UT
Credential Certification: Antier Sarah (sarah.antier@oca.eu)
Subjects: Optical, Supernovae, Transient
We received an alert on a candidate of fast transient by the FINK broker (Peloton, Ishida & Moller et al.) on 2024-06-19T15:27:00 UTC named ZTF24aashinc (https://fink-portal.org/ZTF24aashinc). This transient was classified by Fink on the same day as having an 80 percent probability of being a supernova.
We triggered TAROT/TCH for further investigation in the r' and i' bands and collected data on 2024-06-20 around 8:00 UTC.
Our results, along with public ZTF data, can be found here.
https://skyportal-icare.ijclab.in2p3.fr/public/sources/ZTF24aashinc/version/2ea82bb8358772d4653a3a97e00d23d5
We utilized STDWeb (Karpov et al.) to perform our photometry, using the Pan-STARRS DR1 (PS1) catalog and subtracting the constant flux of the galaxy with a reference PS1 image.
While the residual from the transient is detectable in the r' band , the photometry of the i band substracted image is uncertain due to the difficulty to remove the galaxy constant flux.
According to ZTF data in the r' band, before and after the TCH observations, we conclude that the rising slope of the transient is consistent with a supernovan and therefore, we classify as well ZTF24aashinc as a supernova.
We thank the FINK team for their useful collaboration with GRANDMA.
GRANDMA is a worldwide telescope network (https://grandma.lal.in2p3.fr/) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).
Photometry of TCH