MAXI J0206-749 is a hard X-ray transient detected by MAXI/GSC (ATel #13300) in the direction of the Small Magellanic Cloud (SMC) wing. Follow-up Swift/XRT observations (ATel #13303) identified MAXI J0206-749 with the HMXB RX J0209.6-7427. The short (100s) XRT observation did not show any significant variability (ATel #13303). The last known outburst of the system occurred in 1993 November and was detected by ROSAT PSPC (Kahabka & Hilker 2005). The 1993 outburst reached a luminosity of 1038 erg/s (0.1-2.4 keV band) and lasted for approximately one month.On 2019 November 21, NICER began observations of this target. At the time of writing, a total of 2.354 ks of exposure have been obtained. The mean 0.2-10 keV source count rate is ~77 cts/sec. Pulsation searches reveal a strong 9.29 s periodicity that is visually apparent in the raw data. The fractional pulsed amplitude is 34% (0.4-8 keV). This makes the system only the second confirmed pulsar in the Magellanic Cloud bridge. The NICER spectrum between 0.5 and 10 keV is consistent with a mildly absorbed black body at low energies (kT = 0.159±0.006 keV; hydrogen column density 5.1±1.4×1020 cm-2) plus a power-law continuum with spectral index 0.78(±0.01), giving a flux in the 0.5-10 keV band of 3.7×10-10 erg cm-2 s-1. NICER will continue to monitor the outburst from this source.NICER is a 0.2-12 keV X-ray telescope operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA.
|Publication date||22 Nov 2019|
|Publication status||Published - 22 Nov 2019|
|Series||The Astronomer's telegram|