NuSTAR observation of the newly discovered magnetar SGR 1830-0645

ATel #14092; F. Coti Zelati, A. Borghese, N. Rea (ICE-CSIC, IEEC), G. L. Israel (INAF), P. Esposito (IUSS Pavia), on behalf of a larger collaboration.
on 13 Oct 2020; 20:38 UT
Credential Certification: Alice Borghese (borghese@ice.csic.es)

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NuSTAR observed the newly discovered magnetar SGR 1830-0645 (ATEL #14083, #14085, #14086) on October 12 starting at 07:45:00 UTC and ending at 23:25:00 UTC, for an effective exposure time of 29.4 ks. The source is detected across the energy interval 3-25 keV in the quick look data, at a net count rate of about 1.5 counts/s in the same band (summing up the two focal plane modules).

In a preliminary timing analysis we detected coherent pulsations at a period of 10.41570(3) s (the uncertainty on the value is quoted at a confidence level of 1 sigma).

We modelled the X-ray spectrum using a blackbody plus power law model, corrected for absorption. We fixed the absorption column density at the value measured with NICER, nH = 1.3 x 10²² cm^-2 (ATEL #14086), and obtaining the following best-fitting parameters: blackbody temperature of kT = 1.05+/-0.01 keV and photon index of 1.6+/-0.2 (uncertainties at 1 sigma c.l.). The observed flux is about 3 x 10^-11 erg cm^-2 s^-1 (3-25 keV).

We thank the NuSTAR PI, Fiona Harrison, for approving the DDT request, and the NuSTAR SOC for carrying out the observation and the excellent support.