Abstract
Very-high-energy (VHE; 100 GeV < E „ 100 TeV) and high-energy (HE; 100 MeV < E „ 100 GeV) gamma rays
were observed from the symbiotic recurrent nova RS Ophiuchi (RS Oph) during its outburst in 2021 August by
various observatories, such as the High Energy Stereoscopic System (HESS), Major Atmospheric Gamma Imaging
Cherenkov (MAGIC), and Fermi-Large Area Telescope (LAT). The models that have been explored so far tend to
favor a hadronic scenario of particle acceleration over an alternative leptonic scenario. This paper explores a timedependent
lepto-hadronic scenario to explain the emission from the RS Oph source region. We have used
simultaneous low-frequency radio data observed by various observatories along with the data provided by HESS,
MAGIC, and Fermi-LAT to explain the multiwavelength spectral energy distributions corresponding to 4 days
after the outburst. Our results show that a lepto-hadronic interpretation of the source not only explains the observed
HE-VHE gamma-ray data but the corresponding model synchrotron component is also consistent with the first 4
days of low-radio-frequency data, indicating the presence of nonthermal radio emission at the initial stage of the
nova outburst. We have also calculated the expected neutrino flux from the source region and discuss the
possibility of detecting neutrinos.