INTEGRAL resumes monitoring the Galactic bulge: IGR J17329-2731 still active

E. Kuulkers*, J. Chenevez, A. Bazzano, V. Beckmann, T. Bird, A. Bodaghee, M. Del Santo, A. Domingo, P. Jonker, P. Kretschmar, C. Markwardt, A. Paizis, K. Pottschmidt, C. Sanchez-Fernandez, R. Wijnands

*Corresponding author for this work

Research output: Other contributionNet publication - Internet publicationResearch


On 2018 February 6, INTEGRAL resumed its monitoring program of the Galactic bulge mainly in the 3-100 keV band (see ATel #438; Kuulkers et al. 2007, A&A, 466, 595). The total exposure of the first observation was about 11 ks. The X-ray transients IGR J17329-2731 and GRS 1747-312 were seen to be active by JEM-X.IGR J17329-2731 was discovered in August 2017 (ATels #10644, #10645, #10682), and is possibly a symbiotic binary (ATel #10685). It has been active since then (Bozzo et al. 2018, submitted). We find it is faint, with a detection significance of about 3 sigma in the mosaic, i.e., close to the detection limit of JEM-X. We derive fluxes of 5.5 +/- 2.7 mCrab and 11 +/- 5 mCrab in the 3-10 keV and 10-25 keV energy bands, respectively. GRS 1747-312 is a frequently recurring neutron-star binary X-ray transient in the globular cluster Terzan 6 (see, e.g., in 't Zand et al. 2003, A&A 406, 233); we find it at 31 +/- 4 mCrab (3-10 keV) and 14 +/- 9 mCrab (10-25 keV).No significantly active X-ray transients were seen with IBIS/ISGRI, down to a limit of about 20 mCrab (i.e., about 1e36 erg/s at 8 kpc) in the 18-40 keV band.Further observations of the Galactic bulge within the program are foreseen in the coming months, as well as other INTEGRAL observations aimed at the Galactic Center, see
Original languageEnglish
Publication date7 Feb 2018
Publication statusPublished - 7 Feb 2018
SeriesThe Astronomer's telegram
NumberATel #11273


Dive into the research topics of 'INTEGRAL resumes monitoring the Galactic bulge: IGR J17329-2731 still active'. Together they form a unique fingerprint.

Cite this