INTEGRAL, Swift and SRG/ART-XC joint observation of SRGA J043520.9+552226/AT2019wey

ATel #14100; I. Mereminskiy, A. Lutovinov, A. Semena, S. Molkov, (IKI RAS, Russia), E. Kuulkers (ESA/ESTEC, Netherlands), I. Caballero (ESA/ESAC, Spain), I. Lapshov, A. Tkachenko, R. Krivonos, V. Arefiev (IKI RAS, Russia)
on 16 Oct 2020; 14:38 UT
Credential Certification: Ilya Mereminskiy (i.a.mereminskiy@gmail.com)

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On Oct. 04-06 we performed joint INTEGRAL, SRG/ART-XC and Swift/XRT observations of the X-ray transient source SRGA J043520.9+552226, discovered by SRG/ART-XC as an X-ray counterpart of the AT2019wey source (see ATels #13571, #13932, #13948, #13957, #13976) which is now thought to be the Galactic X-ray binary in the outburst (ATels #13932, #14000, #14003).

Thanks to the long exposure (about 180ks) INTEGRAL/IBIS was able to securely detect the source up to ~120 keV, with a tentative 3-sigma detection in the higher 120-150 keV energy band. The broadband 0.3-150 keV X-ray spectrum could be described with a combination of the multicolor blackbody disk component (kT~0.4 keV) and exponentially cut-off power law (index~1.75, Ecut~200 keV) subject to a mild absorption N_H≈2x10²¹ cm^-2. The total flux is 1.4x10^-9 ergs/cm²/s in the 0.3-150 keV energy band.

We also went through all available data looking for any prominent variability on short timescales, such as eclipses or Type-I bursts. No signs of either were observed.

The ART-XC team is grateful for the INTEGRAL ISOC team and the Neil Gehrels Swift Observatory team for scheduling and performing these observations.

ART-XC is an X-ray telescope on board the SRG observatory. The telescope is designed and built by IKI (Russian Academy of Sciences) and RFNC, with the participation from MSFC/NASA. The SRG observatory was launched from the Baikonur cosmodrome on 13 July 2019 by a Proton rocket, now ART-XC performing its second all-sky survey.