1 2 "RS Ophiuchi | aavso". www.aavso.org. Retrieved 2021-09-28. ↑ "[vsnet-alert 26131] Outburst of RS Ophiuchi". ooruri.kusastro.kyoto-u.ac.jp. Retrieved 2021-08-09. ↑ "ATel #14834: Fermi-LAT Gamma-ray Detection of the Recurrent Nova RS Oph".