INTEGRAL/JEM-X sees a bright X-ray flare from IGR J17391-3021
ATel #14964; Amanda Schriver Maartensson, Jerome Chenevez, Soeren Brandt, Niels Lund, Carol Anne Oxborrow, Ib Lundgaard Rasmussen, Niels Joergen Westergaard, Carl Budtz-Joergensen (DTU Space, Denmark), and Erik Kuulkers (ESA/ESTEC, The Netherlands) on behalf of the INTEGRAL Galactic Bulge monitoring team
on 11 Oct 2021; 10:01 UT
Credential Certification: Jerome CHENEVEZ (jerome@space.dtu.dk)
Subjects: X-ray, Transient
The X-ray source IGR J17391-3021 (= XTE J1739-302) is detected by the INTEGRAL/JEM-X instrument at about 7 sigmas (for a total effective source exposure of 18.5 ksec) during the latest observation of the Galactic Bulge performed by INTEGRAL during revolution 2418 on October 3, 2021 between UTC 12 and 19. Closer analyses of the JEM-X data reveal a short brightening from this source known as a supergiant fast X-ray transient (SFXT) during the satellite pointing 2418-078 taken between UTC 15:07 and 16:06. The average fluxes measured in the 3-10 keV and 10-25 keV images are 48 +/-5 mCrab and 80 +/-10 mCrab, respectively. Outside this time window, the source is not seen and the 3-sigma upper limits are 10 mCrab.
The X-ray flare lasts about 23 minutes with a 3-25 keV peak of 0.25 Crab at UTC 15:21.
A similar flare from this SFXT was detected on 2020 July 9 by MAXI/GSC (Negoro et al. ATel #13871). The latest outburst from IGR J17391-3021/XTE J1739-302 was reported by Swift in 2012 (Romano et al. ATel #4366).
