ZTF24aasrwnv possible classification by GRANDMA

ATel #16674; Y. Rajabov (UBAI), D. Alk (AUS), 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), L. Montarrenti (KNC), M. Serrau (KNC), H. Eggeinstein (KNC)
on 27 Jun 2024; 07:45 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Antier Sarah (sarah.antier@oca.eu)

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We received an alert about a candidate fast transient from the FINK broker (Peloton, Ishida & Moller et al.) on 2024-06-24 09:04:13.999 UTC, named ZTF24aasrwnv (). This transient is classified by FINK with a 33 percent probability of being a Supernova candidate on 2024-06-24 09:36. We triggered the TAROT-TCH telescope for further investigation, observing in the r' and g' bands, as well as 3 kilonova-catcher telescopes. Also we observed ZTF24aasrwnv with UBAI-ST60 at Maidanak observatory in the R band but due to a problem of detector, we couldn’t extract the photometry. We collected data from 2024-06-25 at 04:56:24 UTC for 2 days. Our results, along with public ZTF data, can be found here: https://skyportal-icare.ijclab.in2p3.fr/public/sources/ZTF24aasrwnv/version/57d645b22b1c1e126728b7e23da8b009 We utilized STDWeb (Karpov et al.) to perform our photometry, using the Pan-STARRS DR1 (PS2) catalog, as well a Gaïa for non-sloan filters images. We note that in the TAROT-TCH data, we have slight contamination from other stars. However, we mitigated this effect by subtracting the PS1 reference image. According to the ZTF data in the r' band, both before our observations, as well as ATLAS data (in the orange band), the source has decay rate of 0.3 per day in r-band). Due to its localization near by the galactic plane, we think it is probably a CV. However, spectral analysis would have helped to understand the nature of the source. We thank the FINK team for their valuable 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 the transient