Digital.CSIC. Repositorio Institucional del CSIC instname Digital.CSIC: Repositorio Institucional del CSIC Consejo Superior de Investigaciones Científicas (CSIC) Zelati, F C, Postigo, A D U, Russell, T D, Borghese, A, Rea, N, Esposito, P, Israel, G L & Campana, S 2021, ' Multi-band observations of Swift J0840.7-3516 : A new transient ultra-compact X-ray binary candidate ', Astronomy & Astrophysics, vol. 650, A69 . https://doi.org/10.1051/0004-6361/202140573