Borghese, A.A.BorgheseCoti Zelati, F.F.Coti ZelatiEsposito, P.P.EspositoRea, N.N.ReaDE LUCA, AndreaAndreaDE LUCABACHETTI, MatteoMatteoBACHETTIISRAEL, Gian LucaGian LucaISRAELPerna, R.R.PernaPons, J. A.J. A.Pons2020-12-022020-12-0220180035-8711http://hdl.handle.net/20.500.12386/28622We report on a new NuSTAR observation and on the ongoing Swift X-Ray Telescope monitoring campaign of the peculiar source 1E 161348-5055, located at the centre of the supernova remnant RCW 103, which is recovering from its last outburst in 2016 June. The X-ray spectrum at the epoch of the NuSTAR observation can be described by either two absorbed blackbodies (kT_BB_1 ∼ 0.5 keV, kT_BB_2 ∼ 1.2 keV) or an absorbed blackbody plus a power law (kT_BB_1 ∼ 0.6 keV, Γ ∼ 3.9). The observed flux was ∼9 × 10<SUP>-12</SUP> erg s<SUP>-1</SUP> cm<SUP>-2</SUP>, ∼3 times lower than what observed at the outburst onset, but about one order of magnitude higher than the historical quiescent level. A periodic modulation was detected at the known 6.67 h periodicity. The spectral decomposition and evolution along the outburst decay are consistent with 1E 161348-5055 being a magnetar, the slowest ever detected.STAMPAenGazing at the ultraslow magnetar in RCW 103 with NuSTAR and SwiftArticle10.1093/mnras/sty11192-s2.0-85048510888000439501300055https://academic.oup.com/mnras/article/478/1/741/49909532018MNRAS.478..741BFIS/05 - ASTRONOMIA E ASTROFISICA